Tag: Spaceflight

Mars Monday: Ingenuity flies

Posted on by Inara Pey
Ingenuity hovers 3m above the surface of Jezero Crater, Mars, watched by the Mars 2020 rover Perseverance. Credit: NASA/JPL

April 19th saw aviation and space flight history made 288 million kilometres from Earth, when a tiny drone-like craft weighing just 1.8 kg spun-up two contra-rotating rotor blades, each 1.2 metres in diameter, to 2,500 rpm and then rose into the tenuous atmosphere of Mars to a height of 3 metres, hovered rotated about its vertical axis, then descended to land on the Martian surface once more.

Ingenuity, a proof-of-concept system to test the feasibility of controlled, powered flight on Mars, is a remarkable little vehicle that holds great promise for the future of the exploration of that world. While this initial flight was short – under a minute in total length from spinning-up its rotors to touch-down, it opens the door to more extensive flights over the coming days that will see the vehicle complete more complex manoeuvres. In doing so, it will provide vital information on the behaviour of rotary vehicles on Mars, vehicles that could in the future provide enormous additional potential and capabilities to future robotic missions on Mars and eventually support human missions.

The flight occurred at 07:31 UTC on Monday, April 19th, with telemetry being recorded by the helicopter’s own systems and relayed to the Mars 2020 Perseverance rover, which also recorded the event using its Mastcam-Z camera system and its navigation cameras. The initial data from the flight was then transmitted to Earth some three hours later, with additional images and video being transmitted throughout the day.

The first indication of the success of the flight came not through any pictures but via a simple graphic track of altimeter readings made by Ingenuity. Mostly flat to show the vehicle was sitting on the ground, the track was marked by a sudden “bump” recording the vehicle rise to just over 3 metres, its hover, and then its descent. It was enough to get the helicopter’s flight team – a handful at JPL practising social distancing in a large room, the rest working from home – rejoicing. But the chart was just the opening treat.

The altimeter data track from Ingenuity was the first solid indication that Ingenuity had successfully flown. Credit: NASA/JPL

Following the initial receipt of data, still images in low-resolution captured by Perseverance’s navigation cameras clearly showed the helicopter “jumping” between to close-together points, indicating that during the period between the images, it had flown and landed. However the biggest treat came later in the day with a stream of frames captured by the Mastcam-Z system on the rover.  When strung together, these produced a video of the flight.

Ingenuity is a project more than six years in the making, and has uniquely involved not only multiple NASA space and science centres, but also their aviation research and development centres as well. It was actually a late addition to the Mars 2020 mission, requiring some extensive changes to the rover that had to be made in order to mount the helicopter beneath the rover’s belly, and include a mechanism for deploying Ingenuity onto the surface of Mars.

Ahead of the Mars 2020 launch, Ingenuity want through extensive testing to simulate flight conditions on Mars. This involved placing the vehicle a large vacuum chamber filled with carbon dioxide to a pressure to match the surface atmospheric pressure on Mars – which is the equivalent of Earth’s at an altitude of 30 km. To simulate the low Martian gravity (38% that of Earth’s), a special rig was attached to the demonstrator to counter 62% of its mass. Finally, a wall of 900 computer fans was used to simulate typical surface wind speeds on the surface of Mars, as recorded by the Mars Science Laboratory rover Curiosity.

 All of this allowed engineers to define the optimal size of the helicopter’s rotors, balancing them against Ingenuity’s mass and size and to determine things like their required rate of spin to achieve flight – between 2,400 and 2,500 rpm  – five times the speed of Earth-based helicopter rotors.

A low-resolution image taken by Ingenuity’s downward point camera showing the helicopter’s shadow on the surface of Mars as it hovers at a height of 3m. Credit: NASA/JPL

Even so, flying an engineering test model in a controlled environment is very different to doing the same on Mars – hence a lot was riding on this first flight.

Ahead of it, the area selected for the test flight sequence and previously dubbed “the airfield” was unofficially renamed “Wright Brothers Field”. Having safely dropped off the helicopter there in early April, Perseverance had driven some 70 metres from Ingenuity at a rise overlooking the area that NASA has dubbed “Van Zyl Overlook” in honour of key Ingenuity team member Jakob van Zyl, who passed away unexpectedly in August 2020. From this vantage point it is hoped that the rover will be able to record all of Ingenuity’s flights.

Captured by Ingenuity’s downward-pointing camera, this image shows Ingenuity’s shadow on the surface of Mars just before it lands. Two of the vehicle’s legs can be seen top left and top right, while the 2,500 rpm spin of the contra-rotating blades used to provide lift makes them appear semi-transparent. Credit: NASA/JPL

Prior to the flight, and as noted in my previous Space Sunday update, the flight team had to make some changes to the software overseeing Ingenuity’s first flight. Not only have these adjustments worked well, it is hoped that they will remove any need for running a complete software re-installation on the vehicle – a process that could take several days to complete and severely impact the ability to complete all of the remaining four planned test flights. However, the option of a full re-installation is being kept open should further issues arise with the timing and control processes.

Inn the meantime, it’s going to be a few days before all of the data from the first flight has been analysed. As such, the next flight for Ingenuity has yet to be scheduled.

When it does goes ahead, it should see the helicopter rise to an altitude of around 5 metres, then translate into horizontal flight for a distance of some 50 metres before coming to a stop, then returning once more to land.

As it is, the initial telemetry from Ingenuity shows it is a good health – better, in fact than before it lifted off. This is because the flight removed dust that had been accumulating on the solar cells located above the vehicle’s rotors, interfering with their efficiency.

In all the Mars Helicopter project has three goals:

  • Show via Earth-based testing that it should be possible for a heavier-than-air vehicle  to take flight on Mars – achieve via the vacuum tests described above.
  • Achieve stable flight on Mars – now achieved through this first flight.
  • Obtain data that can inform engineers as to the design and capabilities required by future aerial vehicles that could be deployed to Mars – and also elsewhere in the solar system, such as Saturn’s moon Titan.
Following the flight, the ICAO has officially designated Ingenuity the first of aircraft type IGY, and gave its testing area on Mars the airport code JZRO. image credit: NASA

Continue reading “Mars Monday: Ingenuity flies” →

Space Sunday: to the Moon, ready to fly and pioneers

Posted on by Inara Pey
An artist’s rendering of the SpaceX Starship HLS, now selected by NASA. Credit: SpaceX

On April 16th, in what was something of a surprising announcement, NASA confirmed that SpaceX has been granted the sole contract to develop the first Human Landing System (HLS) required for the Artemis project to return humans to the Moon.

HLS is the technical name given to the vehicle that will physically deliver crews to the surface of the Moon and return them back to lunar orbit. It is also the single element of the Artemis project that more-or-less ruled out the agency meeting the goal of returning the first crew to the Moon by the end of 2024. Developing a space vehicle is not a short-term activity, it requires years of development and testing, and a lot of money. Prior to the announcement, and with just 3.5 years to go for NASA to be able to meet the 2024 goal, it felt as if the decision on any HLS contract was being pushed down the road, NASA’s 2021 budget for any development stood at just US $850 million, around a quarter of the amount requested from Congress.

It was not until April 2020 that initial contracts were awarded to SpaceX and teams led by Blue Origin and Dynetics for initial proposal and develop of potential landing systems (see:  Space Sunday: the Sun’s twin, going to the Moon & SpaceX). At the time NASA indicated they would likely proceed with two of the options; hence the reason for some of the surprise expressed after what was something of a hastily-arranged press conference the focused only on SpaceX gaining the initial contract – although the door is being kept open for the other teams to bid / compete for future Artemis missions.

During the announcement, NASA admitted that costs and a limited budget were a major factor in the decision – the SpaceX bid price for the contract was significantly lower than either Blue origin or Dynetics. A further factor in SpaceX’s favour is their long-term operational relationship with NASA.

In this 2020 rendering (sans the revised landing legs), three of the exhaust ports for the high-thrust RCS system that will be used to bring the SpaceX HLS into a landing can be see below and to the right of the crew egress door. Credit: SpaceX

The contract to develop HLS is US $2.9 billion,  which covers the development of the system over the next few years, and the first two flights – an uncrewed test flight / landing and the first crewed landing. While a lot, this is actually around 13% of the cost of developing the Apollo Lunar lander when the latter is adjusted for inflation.

Nevertheless, the selection of the SpaceX vehicle is somewhat odd. The will be a significantly different vehicle from the proof-of-concept craft SpaceX is currently demonstrating, requiring as it will fully propulsive landings. It will also require substantial on-orbit refuelling just to get to the Moon.

As the vehicle is designed to land tail-first, and the Moon isn’t exactly concrete smooth, it will require substantial landing legs both to land on and keep it upright. These will mean the vehicle will likely require an additional “waist level” set of motor to mange the landing, and thus a substantially different internal layout of motors and fuel tanks.

Nor does it get any easier – for once on the Moon, the crew will be up in the nose of the vehicle, 25-30 metres above the lunar surface. So, to get down to it, they’ll need a complex airlock. elevator system that is robost enough to make repeated trips down from and back up the the crew module – something that is liable to be tiresome when it comes to off-loading equipment.

As the HLS remains in lunar orbit, crews will be delivered to it via the Gateway station using the Orion Multi-Purpose Crew Vehicle / SLS booster combination.

NASA Announcements

Alongside the SpaceX HLS announcement, NASA has also announced a new competition for the development of commercial services that can be used in support of human operations on the Moon – cargo delivery systems and similar.

It has also been confirmed that the second crewed launched to the International Space Station using a SpaceX Crew Dragon vehicle should lift-off fro Kennedy Space Centre at 10:11 UTC on Thursday, April 22nd. The crew, comprising NASA astronauts Shane Kimbrough and Megan McArthur, France’s Thomas Pesquet and Japan’s Akihiko Hoshide, arrived at Kennedy Space Centre on Friday, April 16th, and performed a final pre-launch dress-rehearsal in readiness for the flight which allowed NASA and SpaceX to confirm the launch vehicle is ready for flight.

The NASA / ESA / JAXA Crew-2 arrive at Kennedy Space Centre. (l to r): Thomas Pesquet (ESA / France), Megan McArthur (NASA), Shane Kimbrough (NASA) and Akihiko Hoshide (Japan / JAXA).Credit: NASA

Crew-2 will fly to the ISS aboard the Endeavour, the Crew Dragon used for the August 2020 Demo-2 mission that saw astronauts Douglas Hurley and Robert Behnken made the first human flight to orbit from US soil since the space shuttle was retired in 2011. Similarly, the Falcon 9 booster that will carry them to orbit was also used to fly the Crew-1 astronauts to the ISS in November 2020.

NASA has also received a potential boost from the Biden Administration, which is seeking a 6.3% increase in the agency’s budget for the next fiscal year. In all, the plan published by the administration is requesting US $24.7 billion for the space agency, with US $6.3 billion earmarked for the Artemis programme and US $3 billion for the ISS.

Some US $2.3 billion has been requested for understanding and alleviating climate change, a 10% increase over the prior year. The summary of the spend does not go into specifics on individual missions already in development or being planned, but does point to funding for the Nancy Grace Roman Space Telescope (formally WFIRST), which the Trump administration repeatedly tried to cancel, and a 16% increase for NASA’s STEM funding, which again the Trump administration tried to eviscerate through a combination of closing down related NASA departments and reducing funding.

The Biden Administration is seeking a 6.3% expansion of NASA’s budget for 2022, specifically earmarking the Nancy Grace Roman Space Telescope for funding – a move likely to find favour in congress, which refused three attempts by the Trump administration to kill the project despite its advanced state of developing and low cost. Credit: NASA

Alongside of NASA, the Biden federal budget looks to increase the National Science Foundation’s government funding by 20% (US $10.2 billion) and raise the National Oceanographic and Atmospheric Association’s budget to US $2 billion.

Continue reading “Space Sunday: to the Moon, ready to fly and pioneers” →

Space Sunday: Mars, galaxies and starships

Posted on by Inara Pey
 Mars 2020 mission Sol 46 (April 6th), 2021, a series of 62 images captured using the WATSON imager on the robot arm of the Perseverance rover were used to create this “selfie” of the rover “looking” at the camera, then back at the Ingenuity helicopter sitting on the ground some 4 metres away. Credit: NASA/JPL

NASA has delayed the first flight of the Ingenuity helicopter on Mars after the vehicle detected an issue during one of its pre-flight tests.

For the past week, the agency has been preparing the little helicopter drone, part of the Mars 2020 mission, for the first of a series of 5 pre-planned test flights within Jezero Crater. It had been hoped the flight could take place on Sunday April 11th / Monday April 12th, 2021 (depending on where you are in the world); however it will now not take place until Wednesday, April 14th at the earliest.

After being dropped on the surface of Jezero Crater by the Mars 2020 Perseverance rover (see my previous space Sunday report), Ingenuity successfully recharged its batteries using solar energy and survived its first night alone on Mars without incident. This was a major milestone for the project, as there were fears that if the batteries couldn’t be fully charged and generate sufficient heat, the extreme cold of the Martian night could freeze the vehicle’s electronics, and even crack the batteries themselves.

Since that first night, the helicopter has shown it can keep itself warm and the flight team has spent the week conducting a range of pre-flight checks, including unlocking Ingenuity’s pair of contra-rotating propellers and then testing them under power and at low speeds, then speeding up to higher speeds, including an attempt to reach the 2400 rpm required for take-off.

Part of testing Ingenuity included taking a low-resolution image via its downward-looking camera system while it was still sitting under the rover. April 3th, 2021 / Sol 42. Credit NASA/JPL
All of these tests were completed successfully, with the exception of the final full-speed test attempted on Friday, April 9th. This aborted during the phase when the command programme on Ingenuity was supposed to switch from “pre-flight” to “flight” mode, as will be required ahead of the actual flights. However, a guardian “watchdog” timer designed to oversee the correct execution of command sequences expired before the switch-over occurred, prompting Ingenuity to safely shut-down its motor and await further instructions from Earth.

Following a full evaluation of telemetry received following the curtailed test, the flight team were confident that no actual damage had occurred to the helicopter, stating the full spin-up test of the rotors would be postponed and the flight itself delayed until April 14th. They also indicated that assuming the first flight was completed without incident, the second flight will take place on Sunday, April 18th.

The rotor tests took place once Perseverance was well clear of the helicopter – the rover is gradually making its way to the look-out point where it will record Ingenuity’s flights. However, before it did so, engineers took the opportunity to use the WATSON (Wide Angle Topographic Sensor for Operations and eNgineering) camera on the rover’s robot arm to capture a series of 62 images that were stitched together to produce a picture of Perseverance apparently “looking” back at the helicopter using its mast cam imaging systems, and which can be seen at the top of this article.

Another image Perseverance took that recently caused excitement was one that appeared to show a “rainbow” arcing across the dusty Martian sky. Captured on April 4th (Sol 43), the image spread quickly across social media, as did the “rainbow” explanation.

Captured on April 4th (Sol 43), this image via the rear-facing Hazcam system on Perseverance caused excitement in the media, being described as a “rainbow”. However, it wasn’t any such thing, as NASA was forced to explain. Credit: NASA/JPL

The only problem being, rainbows are impossible on Mars, as NASA quickly stepped in to note through social media:

Many have asked: Is that a rainbow on Mars? No. Rainbows aren’t possible here. Rainbows are created by light reflected off of round water droplets, but there isn’t enough water here to condense, and it’s too cold for liquid water in the atmosphere.

NASA, via the @NASAPersevere Twitter account.

Rather, the “rainbow” was the result of lens flare – light being scattered by the lens of the Hazcam (HAZard avoidance CAMera) that captured the image, to strike the imaging sensor in multiple places like an arc of machine-gun bullets. Such effects are prevented on the front-facing Hazcams (the ones most frequently used by the rover, as they are equipped with sunshades; however, similar shades were deemed superfluous on the rear-facing Hazcams, and so lens flares like this are actually quite common should the system be in use and the Sun happens to be in the right position.

Continue reading “Space Sunday: Mars, galaxies and starships” →

Space Sunday: Ingenuity readies for flight

Posted on by Inara Pey
Ingenuity hangs under the belly of Perseverance at the end of several days of initial deployment.Credit: NASA/JPL

This past week has seen the Mars helicopter Ingenuity successfully deployed onto the surface of Mars in readiness for its first flight – although NASA has announced the flight itself has been delayed.

As I noted in my previous Space Sunday report, the helicopter was unpacked over several days (the work actually commencing prior to that report appearing). It took several days because each stage of the deployment had to be verified to ensure it had been correctly completed using the WATSON camera on  the rover’s robot arm imaging the helicopter from several angles after each phase of the deployment so that engineers on Earth could confirm everything looked correct. However, everything went as expected, and by March 31st (UTC), Ingenuity was in an upright position under the rover, but still connected to it via the power umbilical and backplane support.

At this point proceedings were paused whilst systems were given a final check-out prior to the command being given to release the helicopter to drop the 10-13cm down onto the Martian surface. Once released, Ingenuity would be on its own power-wise, with a limited period in which to charge up its batteries using sunlight, so the engineering team wanted to run through final verification that everything was OK.

On Sunday, April 4th, the Jet Propulsion released images revealing that final step of deployment had been completed, and Ingenuity is standing on Mars, Perseverance having moved several metres away to establish line-of-sight communications with the helicopter.

Caught by the Hazcam system on Perseverance, Ingenuity sits on the surface of Mars after the rover had initially moved away from it following release. This image was taken on mission Sol 43 (Sunday, April 4th, 2021) at a local mean solar time of 15:14. It is a raw image that has not been white balanced for Earth lighting. Credit: NASA/JPL

The next challenge is to ensure the solar cells that the very top of the rotor mast are able to provide energy to the batteries, which can only survive 25 hours without recharge now Ingenuity has been separated from the rover.

It had been hoped that the first in a sequence of five planned flight tests would commence on Thursday, April 8th. However, this has now been delayed until Sunday, April 11th, at the earliest.

A further view of Ingenuity sitting in Jezero Crater after the rover has moved further away. Sol 43 (April 4th, 2021)

The delay is to allow for a full regime of tests to be carried out on the helicopter – which has gained the nickname “Ginny”  among the engineering and flight team at JPL – including its ability to survive the harsh cold of Martian nights and then recharge its batteries during daylight hours. Should all go according to plan, Perseverance will capture the flight, and images / video from both the rover and the helicopter will be released on or shortly after April 12th.

Providing the first straight-up-hover-straight-down flight is a success, the flight team will move on to the remaining four pre-flights for the helicopter, which the hope to complete well inside the 30-day window allowed for the tests – and potentially complete more, if there is sufficient time left before Perseverance must turn to its now duties and say “bye-bye” to  Ingenuity.

Following the first flight, Ingenuity will perform a more complex series of flights, such as the one shown above. Credit: NASA/JPL

When it does commence its own science work, Perseverance may not initially travel too far from the helicopter’s flight zone: whilst Ingenuity was unfolding beneath it, the rover’s team became increasingly intrigued by a green-tinted rock a short distance away.

The yet-to-be-dubbed rock is thought to be a possible meteorite or a piece of bedrock that may have been “popped” up from under the layers of sedimentary rock on which the rover is parked. However, the science team will not be drawn on any conclusions until Perseverance has had the chance to get up close to the rock and focus all of its attention on it. Thus far, the rover has only been able to image the rock using its Mastcam-Z system and zap it a few times with the SuperCam laser system.

That the rock – roughly 15 cm in length – might be a meteorite is not beyond the bounds of possibility: Perseverance’s “sister” rover, Curiosity, happened upon a similar odd rock sitting on the landscape in 2014. Once its duties watching over Ingenuity have ended, Perseverance will be able to devote its full attention on the rock, further utilising its SuperCam laser and spectrometer, as well as the SHERLOC and WATSON combination on its robot arm in an attempt to decipher the rock’s mystery.

The interesting rock – possibly a meteorite – Perseverance has been studying from a distance whilst the Ingenuity helicopter deployment has been underway. Credit: NASA/JPL

Meanwhile, and half a world away, Curiosity has been busy as it continues its investigations of  “Mount Sharp”, the 6 km high mound of deposits left in the centre of Gale Crater, the result of multiple periods of flooding.

At the start of March, Curiosity commenced it most recent science campaign, examining an impressive 6 metre high rock formation dubbed “Mont Mercou” after a mountain in France close the village of Nontron, which is being used to generate monikers for features in the area the rover is exploring due to the presence of nontronite, a type of clay mineral (also named for the village) within the area.

A 3D view of “Mont Mercou” created from a total of 32 images captured by Curiosity on Sol 3049 of its mission – March 4th, 2021. It was made by taking 16 images from one location and then moving 4 metres to take a second set. The resulting stereoscopic effect helps scientists get a better idea of the geometry of the mound’s sedimentary layers, as if they’re standing in front of the formation. This finished view has been coloured balanced to match Earth-type lighting conditions. Credit; NASA/JPL

Continue reading “Space Sunday: Ingenuity readies for flight” →

Space Sunday: getting ready to fly on Mars

Posted on by Inara Pey
An art’s impression of the Ingenuity helicopter on Mars. Credit: NASA

If all goes according to plan, on Thursday, April 8th, we could be witnessing the first powered flight of an aerial vehicle on another planet as the blocky Ingenuity helicopter, part of NASA’s Mars 2020 mission, takes to the air for the first of what should be at least five proof-of-concept flights.

The helicopter itself is not a particularly exciting thing to look at: a cube-like fuselage no more than 20 cm across on its longest side that contains the vehicle’s avionics, a heater system to keep the sensitive circuitry warm and operating, a battery system to provide energy to the headers and the vehicle’s propellers, and its science systems. It is supported by four spindly legs just 38 cm long, and is topped by a mechanism of two contra-rotating co-axial rotor systems measuring 1.2 metres from tip-to-tip, with the main communications antennae above them, topped by the solar panels hat will be used to recharge the vehicle’s batteries.

Ingenuity and its systems. Credit: NASA

However, looks can be deceptive. Ingenuity is actually a highly capable aircraft and spacecraft combined. Its systems were designed to withstand 6+ months of interplanetary space travel , while its flight systems have been designed to get it into the air on  a planet where the atmosphere is only about ​1⁄100 as dense as Earth’s.

To put that in perspective: Ingenuity will be attempting to lift off in an atmospheric density that matches our own at 30,000 metres  – that’s almost four times the height of Mount Everest and a height well beyond the capabilities of any Earthbound helicopter. And where the lower gravity of Mars means Ingenuity ways just one third as much as it does when measured on Earth, this offers little in the way of compensation for the rarefied atmosphere.

Hence why Ingenuity is a proof-of-concept vehicle: just getting aloft with be a tremendous achievement – but if it can be shown to do so repeatedly, and to manoeuvre successfully, it could dramatically alter future robotic and human missions to Mars by providing  aerial support for them as terrain scouts or standalone science vehicles carrying their own payloads  operating remotely or – in the case of human missions – flown drone-like from a base of operations.

The first phase of operations for the mission was for Perseverance to scout the land close to its landing point – Octavia E. Butler Landing – to  find a suitable area of level ground over which Ingenuity can fly. This required finding an area some 90 metres in length and roughly 12-15 metres wide relatively clear of significant obstacles that might limit landing options., and with an area 10 metres on a side from which the first flight will be made and which has been dubbed “the airfield”. 

The flight zone and “the airfield”, the area in which Ingenuity will be test flown. Credit NASA

This deployment requires a number of actions to occur, the first of which came on Sunday, March 21st, when the cover that had been protecting Ingenuity was dropped from under the rover (see my previous Space Sunday update). Once Perseverance is correctly positioned at the centre of “the airfield”, the rest of the deployment will take place over a period of 6 Martian sols (days):

  • Sol 1: restraining bolts locking Ingenuity in place under the rover will be released.
  • Sols 2 and 3: a cable also holding the helicopter will be explosively released, triggering a motor that will gently rotate the helicopter down into an upright position beneath the rover, allowing two of Ingenuity’s landing legs to spring into their deployed position in the process.
  • Sol 4: the remaining two legs on Ingenuity will be released to snap into place. At this point, the helicopter will be slung under the rover, held in place by a single bolt and a set of power connectors.
  • Sol 5: Perseverance will carry out a full charge cycle of Ingenuity’s batteries – until now, the rover has only charged the batteries to around one-third their capacity, enough to keep the helicopter’s system warm.
  • Sol 6: The rover will be commanded to release the helicopter, allowing it to drop the 13 centimetres to the ground.

At this point, things will get a little risky: there will be no means to communicate with the helicopter, and its batteries can only supply it with power for 25 hours without recharge. In this time, a final visual check on Ingenuity must be carried out using the WATSON imager on  the rover’s robot arm, and then the rover must carefully reverse away from the helicopter to a distance of 5 metres.

Once at this distance, the rover will be able to act as a communications relay between mission control and the helicopter, allowing mission control to command the helicopter to switch to charging its batteries from its solar cells and upload the required flight software.

In all, the flight team have 30 days from the moment Ingenuity is released from Perseverance to complete the planned five flights. After this time, the rover must commence its own science programme. The flight team will therefore be looking to complete those five flights in as short a space of time as possible. For the first flight, Ingenuity will do little more than attempt to rise to a height of 3 metres, hover for 30 seconds and then land safely. After this, the remaining four flights will be for longer and to heights of around 5 metres, and for increasing distances down “the airfield”.

If we get past those [flights], we will assess:  did we meet all our objectives during those flights? Do we want to go back and retry some of those things? Or, if everything goes really well, then we might try to stretch our capabilities beyond those basic capabilities.    

– Ingenuity chief pilot Håvard Grip

The late Jakob van Zyl after whom the elevated position from which Perseverance will observe Ingenuity’s flights has been named. Credit: NASA

All of the flights will hopefully be documented by Perseverance its powerful Mastcam-Z camera system and two on-board microphones from an observation point some 60 metres from “the airfield”, which it will drive to prior to the first flight.

This observation point has been dubbed the Van Zyl Overlook in honour of key Ingenuity team member Jakob van Zyl, the former director for solar system exploration and associate director for project formulation and strategy at NASA’s Jet Propulsion Laboratory, who passed away unexpectedly in August 2020.

When it makes its flights, Ingenuity will both make history and carry a piece of history with it: attached to the Helicopter is a small piece of fabric taken from the Wright Brother’s 1903 biplane, credited with making the he first powered, controlled flight on Earth on December 17th, 1903.

‘Oumuamua is Likely a Piece of a Planet

In 2017 the Pan-STARRS astronomical observatory in Hawaii identified an object of extra-solar origin on a course that would carry it around the Sun. Named  ‘Oumuamua, meaning “scout” or “messenger” in Hawaiian, it was the first such object to be positively identified as coming from beyond the solar system,  although it is now believed that as many as five such object could pass through the solar system every year.

‘Oumuamua, however, was not only the first to be positively identified, it was also highly unusual – so much so that it couldn’t be classified as either an asteroid or a comet, as it exhibited behaviour common to both – and behaviour and attributes not found in either. This has lead to a variety of possible theories being put forward for it might be – up to and including the idea it was actually an interstellar probe created by an alien intelligence.

An artist’s impression of 1I/2017 U1 (or `Oumuamua), which was first seen by the Pan-STARRS 1 telescope in Hawaii on October 19th, 2017, and subsequently studied by a number of telescopes around the world, including the VLT of the European Southern Observatory (ESO). Credit: ESO / M. Kornmesser

However, two astrophysicists from Arizona State University believe they now have solved the mystery of ‘Oumuamua.Taking the more comet-like behaviours of the object, Steven Desch and Alan Jackson started looking for combinations of ices and volatiles that, when affected by the heat of the Sun, who produce the kind of reactions seen with ‘Oumuamua.

Their research lead them to a combination of nitrogen-dominant ices that, under computer modelling, not only produced the kind of non-tail generating outgassing seen with ‘Oumuamua, they they closely match combinations of nitrogen, methane and other ices found on Pluto and Neptune’s moon Triton.

These findings, coupled with further computer modelling, tend to suggest ‘Oumuamua  is likely a part of a Pluto-like planet orbiting a star somewhere in our stellar neighbourhood (separate estimates of data gathered on the object suggest it is around a billion years old, so must has originated fairly close to us, given its observed velocity through the solar system). If correct, then Densch and Jackson may not only have solved the nature of ‘Oumuamua , they may have shown that a new class of exo-planets exists: so-called “exo-Plutos”.

Continue reading “Space Sunday: getting ready to fly on Mars” →

Space Sunday: more from Mars and recalling a NASA legend

Posted on by Inara Pey
A CGI model of the Mars 2020 rover Perseverance on the surface of Mars. Credit; NASA

NASA’s Mars 2020 Perseverance rover has passed its first month on Mars, an event marked by the science and engineering teams continuing to check out the rover’s systems  and instruments as the rover continues its initial drive within Jezero Crater.

So far, all of this has been going exceedingly well. We’ve had no major technical issues. We’ve had no major technical issues.

– Ken Farley, Perseverance project scientist

Currently, the mission team are preparing to deploy the Ingenuity drone helicopter ahead of for a series of proof-of-concept flights. This has involved driving the rover short distances to locate a suitable area in which to deployed the helicopter, which is stored under the rover.

So a location was found during the past week, and on Sunday, March 21st, Sol 30 for the rover on Mars, the command was sent to eject the cover that projected the delicate helicopter during the rover’s arrival on Mars. The release of the cover was filmed by the WATSON imager on the rover’s robot arm, with raw colour and black and white images issued by NASA a few hours after the cover had been dropped.

Two images of captured by the WATSON imager on the Mars 2020 rover robot arm show fore-and-after views, one in black-and-white and the other in colour, of the detached protective cover for the Ingenuity helicopter droner. The helicopter can be seen stowed and attached to the rover’s belly at the top of each image. Credit: NASA/JPL

The next stage will be for the rover to move clear of the cover so the helicopter itself can be deployed, before the rover backs away even further to expose the drone to clear air. It’s not clear when this deployment will take place, but NASA will be holding a special briefing on Tuesday, March 23rd at 17:30 UTC at which members of the helicopter and rover team will discuss progress with the mission and what will be involved in the helicopter deployed and flight operations  commence. The briefing will by available on NASA TV and YouTube, with questions being accepted via social media using #MarsHelicopter.

The first flight won’t be made any earlier than the first week of April, but it will be filmed by the rover using its high-resolution Mastcam-Z systems, and an attempt will be made to record the sound of the drone flying. In all, five flights of the helicopter are anticipated, after which Perseverance will commence its own science mission.

As things stand, this will be a two-phase mission, the first being an exploration of the inflow delta created by the water that once flowed into the crater to form a lake. In particular, the rover will be looking for evidence of past life in the sediments and rocks. Along the way, it sell select a spot to deposit up to 10 samples it has gathered during its studies, which my be collected by a future sample-return mission.

The second phase will see Perseverance may its way out of the crater to examine the crater rim and the plains beyond. Here again, it will select a location to deposit up to 28 samples that may be gathered by a future sample-return mission.In all, both phases of the mission – which will be subject to change depending on discoveries made along the way – are expected to take around 7 years to complete and will see the rover cover some 35 km.

In the meantime, the rover’s microphones have been busy; as I reported in  my last Space Sunday, one has recorded the sound of the Martian wind. More recently, NASA has released a recording on the rover’s EDL (Entry, Descent. Landing) microphone capture of sounds of the rover driving on Mars.

Those expecting some high-tech sound of purring electrical motors and so on as depicted in sci-fi films are liable to be disappointed by the strange mix of bangs,clunks and thuds recorded as the rover’s aluminium wheels and its spring suspension deal with the uneven terrain. Two recordings were released, one at 16 minutes in length, and a 90-second “cleaned up” recording, that is embedded below.

If I heard these sounds driving my car, I’d pull over and call for a tow. But if you take a minute to consider what you’re hearing and where it was recorded, it makes perfect sense.

– Dave Gruel, lead engineer for Mars 2020’s EDL Camera and Microphone subsystem.

One of the reasons the sounds seem to be odd is because the EDL microphone isn’t designed to record the the sound of the mobility system directly, rather it is picking the sounds up through the body of the rover.

Glynn Lunney

Glynn Stephen Lunney may not be a name familiar to many interested in human space flight, but he was one of the legends of NASA, and who sadly passed away at the age of 84 on March 19th, 2021.

Born in November 1936 in the coal city of Old Forge, Pennsylvania, Lunney was encouraged by his parents to seek a career away from the mines. An early interest in flight and model aeroplanes led him to engineering in college, form where he enrolled at the Lewis Research Centre in Cleveland, Ohio, to study aerospace engineering, the centre at that time forming part of the US  National Advisory Committee for Aeronautics.

Graduating in 1958 with a Bachelor of Science degree, Lunney remained with the NACA as a researcher in aerospace dynamics at Lewis. He was thus one of NASA’s very first employees when on July 29th, 1958 President Eisenhower signed it into existence, subsuming the NACA into it in the process.

Lunney’s prowess in the fledgling field of space flight was immediately recognised, and he was transferred to Langley Research Centre, Virginia, where in September 1959, and aged just 21, he became the youngest member of the Space Task Group, the body given responsibility for the creation of NASA’s human space flight programme.

Glynn Lunney “in the trenches” (as the rows of consoles at mission control were called at the time) of the mission simulation centre, 1966. Credit: NASA
As a member of the Flight Operations Division, Lunney was one of the engineers responsible for planning and creating procedures for Project Mercury, America’s first manned space programme. Here he was a major part of the team that wrote the first set of mission rules by which both flight controllers and astronauts operated, and he also became the second man to serve as the Flight Dynamics Officer (FIDO), responsible for controlling the trajectory of the Mercury spacecraft and planning adjustments to it.

Such was Lunney’s quiet assurance, professionalism and engineering skill, he was one of three men selected by Christopher C. Kraft, the hands-on head of mission operations, to join him in becoming the first generation of Flight Directors responsible for managing all of NASA’s space flights, the other two being John Hodge and the legendary Gene Kranz. Together, these for men did much to establish the protocol  and procedures required for human space flight at that time, and they also oversaw the design and implementation of the first two Mission Operations Control Rooms which were to become famous as “mission control” in the Apollo era.

Lunney (seated, foreground) walking his team through the process of transferring guidance and navigation data from the Apollo 13 command module to the lunar module,  1970. Credit: NASA

Although only 29 when selected by Kraft, Lunney was, in addition to his responsibilities as a Flight Director, charged with overseeing the testing of core elements of Apollo flight hardware, including the launch escape system, and the first uncrewed flight test of the the Saturn V launch vehicle.

Lunney was particularly respected for his ability to absorb and retain information, running through scenarios and options much faster than any of his colleagues. This was especially important in the wake of the Apollo 13 explosion in  1970, with the vehicle en-route to the Moon.

While Genz Kranz and his White flight team tend to get all of the credit for successfully guiding the astronauts through the crisis and getting them back to Earth, it was actually Lunney who orchestrated the entire process of powering-up the lunar module, transferring the flight guidance and navigation data to its computer and  getting the Apollo 13 crew and critical equipment into the module within a very short time frame, whilst also leaving the command module in a condition whereby it could hopefully be powered up later. In doing so, he largely steered his team by using his own innate knowledge of systems aboard both craft.

Continue reading “Space Sunday: more from Mars and recalling a NASA legend” →