Tag: engineering

DARPA picks three smallsat rocket companies for launch challenge

9:59 am

Capitalism in space: DARPA has chosen Vector Launch, Virgin Orbit, and a third unnamed company to compete for up to $10 million in prizes in its quick launch competition.

The Defense Advanced Research Projects Agency (DARPA) is giving $400,000 to each of three companies chosen to compete in the “DARPA Launch Challenge” to demonstrate rapid and responsive launch of small payloads. Tucson-based Vector Launch, Virgin Orbit, and a “stealth” startup will now have the opportunity to compete for prizes up to $10 million for successfully proving they can successfully launch twice in a row within a short timeframe from being provided mission parameters, DARPA told reporters here April 10.

First, I wonder why Rocket Lab was not picked. I suspect this is because it is already launching operational missions, and so does not need this developmental boost. Also, its rocket might not meet DARPA’s criteria. The launch systems of both Vector and Virgin Orbit are designed to allow them to quickly transport their rocket to any number of launch sites and go. Rocket Lab’s Electron appears to need a more established launchpad.

Second, I wonder what that third unnamed startup is. There are more than two dozen in development right now, but I can only think of one, Exos Aerospace, that has actually done any successful test flights, albeit suborbital. Whether its reusable SARGE suborbital rocket, being used to incrementally develop an orbital version, fits DARPA’s needs is not clear.

It could also very well be that DARPA has not actually chosen a third company, but has informed several that they can get that third slot, if they can achieve certain goals in a certain time frame. It could be that both DARPA and these companies would rather keep this private competition private. For the companies, they’d rather not advertise their failure to win it. For DARPA, the goal is to help, not hurt, the companies.

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The central peaks of Compton Crater

2:08 pm

Central peaks of Compton Crater

Cool image time! The Lunar Reconnaissance Orbiter (LRO) science team today released a beautiful oblique image looking of the central peaks of Compton Crater, a far side crater with a floor that is fractured and is one of about 200 hundred such craters.

Today’s Featured Image highlights an floor-fractured crater (FFC) that could tell us much about the lunar crust. An asteroid or comet impact is thought to have excavated 146.6-kilometer-wide Compton crater about 3.85 billion years ago. Igneous intrusion or viscous relaxation — or perhaps both processes — subsequently produced branching fractures and small basalt plains within Compton crater. The latter are darker than their surroundings.

Unlike Copernicus Crater, the surface appears smooth. Go to the link and zoom in to see what I mean. All the fractures appear very large and filled in. Of course, that could be because of the image’s resolution, and that other images might show more details and pits.

I find the central peaks more intriguing, however. It appears that, following their formation they were hit by several bolides, one of which carved a gigantic deep hole into those peaks.

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Results from Europe’s Trace Gas Orbiter at Mars

1:47 pm

The European Space Agency today released the results of more than a year of observations from its Trace Gas Orbiter (TGO), among which were two significant findings.

First, the orbiter detected no methane in Mars’s atmosphere, contradicting recent results from both Curiosity and Mars Express.

The new results from TGO provide the most detailed global analysis yet, finding an upper limit of 0.05 ppbv, that is, 10–100 times less methane than all previous reported detections. The most precise detection limit of 0.012 ppbv was achieved at 3 km altitude. As an upper limit, 0.05 ppbv still corresponds to up to 500 tons of methane emitted over a 300 year predicted lifetime of the molecule when considering atmospheric destruction processes alone, but dispersed over the entire atmosphere, this is extremely low.

…“The TGO’s high-precision measurements seem to be at odds with previous detections; to reconcile the various datasets and match the fast transition from previously reported plumes to the apparently very low background levels, we need to find a method that efficiently destroys methane close to the surface of the planet.”

It appears they think the Curiosity and Mars Express detections were very localized and occurred close to the surface, where TGO could not detect it.

The second significant finding is indicated by the map below, showing a global map of subsurface water distribution on Mars. I have also posted below this map a global elevation map from Mars Reconnaissance Orbiter (MRO), as the similarities and differences are important.
» Read more

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Astronomers take highest resolution radio image of black hole

9:54 am

shadow of black hole

Using a network of ground-based radio telescopes astronomers today released the highest resolution radio image of black hole ever produced.

Before giving more details, I must correct every other news report, as well as all of the press releases about this image. It is not “The first image of a black hole!” as these releases are claiming breathlessly. Radio telescope arrays have taken such images in the past, but their resolution was poor, so the result was not very imagelike. Instead, it showed contour lines in a coarse manner. Moreover, the coarseness of the resolution prevented them from seeing the black hole’s shadow itself.

This image now produced has the highest resolution ever for such a radio image, but believe me, it is still coarse. Nonetheless, it represents a giant technological leap forward. The effort required upgrades to many of these telescopes, along with significantly improved computer analysis. Now for some details:

Black holes are extraordinary cosmic objects with enormous masses but extremely compact sizes. The presence of these objects affects their environment in extreme ways, warping spacetime and super-heating any surrounding material. “If immersed in a bright region, like a disc of glowing gas, we expect a black hole to create a dark region similar to a shadow — something predicted by Einstein’s general relativity that we’ve never seen before,” explained chair of the EHT Science Council Heino Falcke of Radboud University, the Netherlands. “This shadow, caused by the gravitational bending and capture of light by the event horizon, reveals a lot about the nature of these fascinating objects and allowed us to measure the enormous mass of M87’s black hole.”

The image reveals the black hole at the center of Messier 87, a massive galaxy in the nearby Virgo galaxy cluster. This black hole resides 55 million light-years from Earth and has a mass 6.5-billion times that of the Sun.

…Multiple calibration and imaging methods have revealed a ring-like structure with a dark central region — the black hole’s shadow — that persisted over multiple independent EHT observations. “Once we were sure we had imaged the shadow, we could compare our observations to extensive computer models that include the physics of warped space, superheated matter and strong magnetic fields. Many of the features of the observed image match our theoretical understanding surprisingly well,” remarks Paul T.P. Ho, EHT Board member and Director of the East Asian Observatory. “This makes us confident about the interpretation of our observations, including our estimation of the black hole’s mass.” [emphasis mine]

Note the highlighted words. To create this image they needed to combine data from numerous radio telescopes. Such work requires extensive calibration. The resulting image is manufactured, though without doubt it is manufactured from real radio data accumulated by multiple telescopes. Because those telescopes are separated by distance, however, there will always be gaps between their images, and it is in the calibration and imaging methods that the gaps are extrapolated away.

I don’t wish to imply that this image is fake. It is not. That the features persisted over multiple observations confirms that they were actually seeing the black hole’s shadow. It also confirms that these new interferometry techniques work.

However, much of the press hyperbole today is an effort to justify the many millions in tax dollars spent on this effort. The effort was absolutely worthwhile scientifically, but government bureaucracies always feel a need to oversell their work. That is partly what is happening here.

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A dance of dust devils

3:42 pm

A dance of dust devils on Mars

Many of my image posts about Mars have emphasized how slowly things change there. This post will highlight the exact opposite. When it comes to dust devils, it appears they can leave their trace frequently and often, and for some reason they seem to also favor specific locations.

June 2011
Click for full image.

The string of images above are all of the same location in the southern highlands of Mars. All were taken by the high resolution camera of Mars Reconnaissance Orbiter (MRO) and can be found in the camera’s archive. I have cropped them to show the same approximate matching area. The first image in that strip above, shown at higher resolution to the right, was taken in June 2011 and titled “Possible Gully Features” by the MRO science team. This is not surprising, as the rounded hills in this image are actually the southwest rim of a large crater, and the slopes of craters have been found one of the best places to find the gullies where seasonal changes occur, all possibly caused by underground water.

From the title, it appears that the science team might have first hoped to spot either slope streaks or recurring slope lineae, the two most intriguing of these changing features. Instead, that 2011 image showed them a very eroded crater rim with a small scattering of dust devil tracks.

November 2018
Click for full image.

This lack of gullies probably reduced interest in this location. It wasn’t until seven years later, in November 2018, that the MRO team decided to take another image of this location (the second image in the strip above and shown to the right at higher resolution). This time they found a significant increase in the number of dust devil tracks.

At this point the decision must have been made to take another image of this location a month later in December 2018. I assume the scientists were curious to see if they would spot any additional changes in that one month period. This was dust devil season, so the likelihood of seeing more tracks was not unreasonable.

How many tracks appeared, and whether they were concentrated in any particular place, such as the ridge lines, would help researchers better understand what generates them, which in turn will give them a better understanding of the Martian atmosphere.

The result was astonishing.
» Read more

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ULA to fly Vulcan components on Atlas 5 flights

9:14 am

Capitalism in space: In order to speed the development of its next generation commercial rocket, the Vulcan Centaur, ULA will fly Vulcan components as they are developed on its Atlas 5 rocket.

The first Vulcan technology to fly on Atlas 5 will be new payload fairings from Swiss supplier Ruag built using an “out-of-autoclave” production process that enables fairing halves to be produced as one piece, a process Ruag says lowers production time and costs. “The out-of-autoclave fairings, which are manufactured by Ruag, and now in the U.S. — they are in a factory next to ours in Decatur — that’s going to fly on Atlas 5 this year,” Louradour said.

Sometime in 2020 they will then fly an Atlas 5 launch using the solid rocket boosters Northrop Grumman is building for Vulcan.

This is not really news. When ULA announced their plans to build Vulcan in 2015, they said then that they intended to transition from Atlas 5 to Vulcan over time, slowly introducing components on Atlas 5 until it was entirely replaced.

Nonetheless, it shows that ULA is adopting some of the the same common sense development procedures used by SpaceX. By taking advantage of launches as they happen, they can speed development. And they need to do this in order to keep pace with SpaceX.

Isn’t competition wonderful?

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Chandrayaan-2 likely delayed to July

9:05 am

The new colonial movement: The launch of India’s first lunar lander/rover, Chandrayaan-2, will likely be delayed again, from May until July.

This further delay is not confirmed by ISRO, India’s space agency. Nor is any clear reason given in the article above to explain this additional delay.

It would not surprise me however. The head of ISRO, K. Sivan, is a trained engineer. He has shown himself to be very willing to impose delays if he has any doubts about the success of the mission.

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Rocket Lab now building smallsats also

9:00 am

Capitalism in space: Rocket Lab announced this week that it is now offering satellite manufacture in addition to its launch services.

The “Photon” satellite platform was developed so that customers would not have to build their own satellite hardware. “Small satellite operators want to focus on providing data or services from space, but building satellite hardware is a significant barrier to achieving this,” said Rocket Lab founder and chief executive Peter Beck, in a statement. “The time, resources and expertise required to build hardware can draw small satellite operators away from their core purpose, delaying their path to orbit and revenue. As the turn-key solution for complete small satellite missions, Rocket Lab brings space within easy reach. We enable our customers to focus on their payload and mission – we look after the rest.”

The satellites are designed for a range of Low Earth Orbit missions including technology demonstrations, risk reduction pathfinders, constellations, and hosted payloads, the company said in a statement.

This is not surprising. With their Electron rocket now operational, and about to begin monthly launches, they have the profits and margin to offer a complete launch package to smallsat customers.

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Falcon Heavy launch now set for tomorrow evening, April 10

8:43 am

Capitalism in space: SpaceX’s second launch of its Falcon Heavy rocket, the world’s most powerful, has now been rescheduled for 6:36 pm (eastern) on April 10.

This will definitely be worth watching. (I will post the SpaceX live stream link when it goes up.) If all goes well, the three first stage boosters will all land themselves after first stage separation, with two coming in simultaneously on neighboring landing pads in Florida, with the third landing very shortly thereafter on its landing barge in the Atlantic.

A success here will also give the Falcon Heavy two successful launches, two more than SLS (with none), and one more than China’s Long March 5, which is half as powerful but has not launched in almost two years after it failed on its second launch attempt.

The comparison with SLS is more pertinent. Tomorrow’s launch, if successful, will once again demonstrate the complete failure of NASA’s SLS rocket. This government boondoggle has been in development since 2004 in various iterations, for a cost that is likely to exceed $25 billion, fifty times more than it cost SpaceX to develop and make operational the Falcon Heavy. SLS’s first launch, originally scheduled for 2017, is now set to launch in June 2020, but is also more likely to be delayed months, if not more. Beyond that it will likely be more years before its second launch.

Falcon Heavy meanwhile is scheduled to do its third launch in mere months, should tomorrow go off without a hitch. It also has contracts for at least seven future launches. Nor would I be surprised if it completes most of these launches before SLS flies for the first time.

At some point the dimwits in Washington will I hope finally notice the contrast, and stop wasting money on SLS. Give it time, however. They are not very smart, and aren’t really interested in the needs of the American nation.

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Jupiter’s atmosphere reacts quickly to the solar wind

5:42 pm

New data from ground-based telescopes show that the atmosphere of Jupiter quickly changes due to changes in the solar wind, and that these changes descend deeper into the atmosphere than expected.

Auroras at Earth’s poles (known as the aurora borealis at the North Pole and aurora australis at the South Pole) occur when the energetic particles blown out from the Sun (the solar wind) interact with and heat up the gases in the upper atmosphere. The same thing happens at Jupiter, but the new observations show the heating goes two or three times deeper down into its atmosphere than on Earth, into the lower level of Jupiter’s upper atmosphere, or stratosphere.

…”What is startling about the results is that we were able to associate for the first time the variations in solar wind and the response in the stratosphere – and that the response to these variations is so quick for such a large area,” said JPL’s Glenn Orton, co-author and part of the observing team.

Within a day of the solar wind hitting Jupiter, the chemistry in its atmosphere changed and its temperature rose, the team found. An infrared image captured during their observing campaign in January, February and May of 2017 clearly shows hot spots near the poles, where Jupiter’s auroras are.

Considering Jupiter’s size, for these effects to extend so quickly really is startling.

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Thumbprints on Mars!

5:19 pm

Thumbprints terrain on Mars!
Click for full image.

Honestly, don’t ask me. I didn’t come up with the name. I found the image on the right, cropped and reduced to post here, as part of the April image dump from the high resolution camera of Mars Reconnaissance Orbiter. The uncaptioned release dubbed this “Thumbprint Terrain in Northern Mid-Latitudes,” and it is obvious to see why. The cropped image on the right focuses in on the oval white mounds that really do look like some giant child was touching a soft damp muddy surface randomly with his fingers, leaving behind raised fingerprints as the mud stuck to his fingers as he pulled them away.

Each white area seems to have a crater. I suspect these are not impact craters, but possibly mud volcanoes, as each is at the top of a mound. My hypothesis is further strengthened by the location, which is deep within the low northern plains of Mars, a place where some scientists believe an intermittent ocean once existed. These mounds could have easily formed at that ocean’s floor, or thereafter when the land here was drying out.

On the other hand, these could be from impact. Maybe they are scattered ejecta from a larger impact, landing here in a group on a wet muddy surface. The impacts might have concentrated the material around the crater, making it more resistant to erosion, which is why the craters now stand above the floor of the plain.

On the third hand, all these theories could be wrong. Have any of your own?

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SpaceX drops protest against NASA launch decision

10:54 am

SpaceX has decided to withdraw its protest against NASA’s decision to choose ULA as the launch vehicle for its Lucy asteroid mission.

The company did not provide any reason for the withdrawal. I suspect Musk decided that it was doing SpaceX harm both publicly and privately. Publicly it threatened the launch date of Lucy, which might cause a significant and fatal delay to the mission. That did not make SpaceX look good to the general public.

Privately, I suspect that the protest was hurting SpaceX with NASA officials. They almost certainly did not say so directly, but I am certain they were able to make this clear in any number of ways. This, combined with the agency’s new willingness to consider commercial rockets, like the Falcon Heavy, for its lunar plans, probably convinced SpaceX that it was doing itself more harm than good with the protest.

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Smallsat rocket company Relativity gets its first launch contract

10:45 am

Capitalism in space: The smallsat rocket company Relativity has signed its first launch contract, even though they have yet to complete even one test flight.

Their chief executive nails the importance of this on the head:

In an interview, Tim Ellis, chief executive of Relativity, said the contract is the first customer for the Terran 1 that the company has announced. He said Relativity previously signed a contract with another customer that has yet to be announced.

“What’s really notable about this and why it’s so important for Relativity and the industry is that this is the first time that Telesat, or any major global satellite operator, has selected a completely venture-based aerospace startup for launch services,” Ellis said, noting that the companies had been in extensive discussions prior to announcing this contract. “The credibility of aligning with Telesat we believe is huge for what Relativity is developing.” [emphasis mine]

Their rocket, Terran-1, is not scheduled for its first orbital flight until the end of 2020. Yet, Telesat has given this company a contract. I suspect that contract has a variety of exit clauses, but I also wonder if it gives Telesat some interest in the company in exchange for backing it at this early stage.

Either way, the demand for launch services created by these proposed new smallsat constellations is forcing the satellite companies to make deals that they might never have considered in a less booming market.

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Bennu’s cobbled equatorial ridge

10:38 am

Bennu as seen by OSIRIS-REx
Click for full image.

The OSIRIS-REx science team has released a new close-up image of Bennu, this time showing the asteroid’s equatorial ridge. The image on the right is that photograph, reduced to post here.

When the image was taken, the spacecraft was positioned over Bennu’s northern hemisphere, looking southward over the asteroid’s equatorial bulge. The field of view shown is 168 ft (51.2 m) wide. For scale, the bright, rectangular rock above the dark region is 8 ft (2.4 m) wide, about the size of a long bed on a pickup truck

Like Ryugu, the scientists for OSIRIS-REx are going to be challenged in finding a location smooth enough for their touchdown sample grab. That surface reminds me of some avalanche scree slopes I’ve hike across, where you’ve got nothing but rough rocks to walk on.

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Parker survives its second close Sun flyby

10:28 am

The Parker Solar probe has survived its second solar flyby, passing within fifteen million miles of the Sun on April 4.

It was moving at 213,000 miles per hour at that moment, which is probably a speed record for any human vehicle. That however is a record Parker will likely break on future fly-bys.

The entire close encounter runs from March 30 to April 10, during which the spacecraft gathers data about the Sun’s inner corona (the sun’s atmosphere).

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Beresheet’s first pictures of the Moon

1:46 pm

Beresheet looks at the Moon

The new colonial movement: The privately built Israeli planetary probe Beresheet, now in lunar orbit, has released its first pictures of the Moon.

The image on the right is one of those images, cropped to post here, and was taken from about 300 miles altitude. The link has a second image showing the Moon with the Earth in the distance. The resolution of both images is quite impressive.

The landing is scheduled for April 11. Stay tuned!

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The eye of a storm on Jupiter

9:26 am

Storm on Jupiter

The image on the right, cropped to post here, was taken by Juno on February 12, 2019 as the spacecraft made its 17th close approach of Jupiter. The Juno science team today has highlighted this version, processed by citizen scientists Gerald Eichstädt and Seán Doran to enhance the details therein. They note how the white clouds can clear be seen sitting above the colored clouds below.

I cropped it to show the center of the storm. The full image is equally spectacular, as it shows the full storm. Unfortunately, there is no scale, but I suspect you could probably fit the entire Earth several times across the diameter of the storm.

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OSIRIS-REx maps Bennu by laser

8:32 am

The OSIRIS-REx science team today released a short animation showing a topographical global map of the asteroid Bennu, created by the spacecraft’s laser altimeter, dubbed OLA.

From Feb. 12 through 17, OLA made more than 11 million measurements of the distance between OSIRIS-REx and Bennu’s surface as the spacecraft flew less than 1.2 miles (2 km) above the surface – the closest orbit ever achieved by spacecraft. OLA obtained these measurements by firing laser pulses at Bennu and measuring the amount of time it takes for the light to bounce off the asteroid’s surface and return to the instrument. That time measurement is then translated into altitude data. Using this data, the OLA team created the 3-D model of Bennu’s surface.

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Falcon Heavy dress rehearsal countdown and static fire today

8:14 am

Capitalism in space: SpaceX hopes to complete today its standard prelaunch dress rehearsal countdown for the second Falcon Heavy launch, now likely scheduled for April 9.

The launch had previously been set for April 7.

The article provides a nice overview of the Falcon Heavy. It also included this tidbit:

Unlike most past missions, the two side boosters are already booked for a second launch. They – in addition to the brand new center core B1057 – will help launch the Air Force’s STP-2 mission, currently No Earlier Than (NET) June.

That they have already scheduled reuse of the side boosters for the next Falcon Heavy launch indicates just how confident they have become about recovering those boosters.

UPDATE: Dress rehearsal countdown and static fire have been completed. According to an Elon Musk tweet, the data looks good, but he cautioned that as this will be the first Falcon Heavy launch using Block 5 boosters, the launch date might change as they review the data.

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Hayabusa-2’s successfully bombs Ryugu

7:51 am

impact on Ryugu

Japan’s Hayabusa-2 probe yesterday successfully impacted an explosive charge on the surface of the asteroid Ryugu, creating a crater for observing the interior geology.

The image to the right was taken by a camera that has separated from Hayabusa-2 and stayed closer to the impact. It shows material flying off the asteroid’s surface, at the horizon line.

Hayabusa-2 — which moved to the other side of the asteroid to stay clear of any ejecta — will next arc around and get close to this impact site to study it. They first need to make sure the ejecta has cleared.

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Monitoring the ice scarps on Mars for changes

1:30 pm

Scarp #1 in 2011
Click for full image.

Scarp #1 in 2018
Click for full image.

Back in January 2018 planetary scientists released a paper announcing the discovery of a number of Martian cliff faces, or scarps as they called them, that all appeared to expose an underground layer of ice.

Those cliffs were mostly located to the southeast of Hellas Basin, the basement of Mars that is also advantageous for human colonization because its lower elevation means its atmosphere is thicker. (For example, that thicker atmosphere would make air transportation more practical.)

The two images to the right show what they listed as scarp #1 in their paper, rotated, cropped, and reduced to post here. The first image was taken in May 2011, with the second taken in December 2018, and was part of the March image release from the high resolution camera of Mars Reconnaissance Orbiter (MRO).

The December 2018 image was taken almost a year after the paper release, and was titled “Scarp Monitoring.” I therefore wondered whether the scientists had identified any changes. They theorize that these scarps form when the exposed ice slowly sublimates to gas into the atmosphere, causing the cliff face to collapse and retreat, which in the case of scarp #1 would be a retreat to the north. The terraces below the scarp suggest previous cliff locations. In their paper they noted evidence of some changes in the studied scarps, including some fallen boulders, as well as color changes that suggest some evolution.

The rate of that retreat is not known with precision, but based on the facts presently at hand, the scientists have estimated that it took about a million years to form this scarp. Whether any evidence of this retreat would be visible in only seven years is the purpose of these scarp monitoring images.

Do you see any difference? I don’t, but because I also don’t trust my expertise I decided to email the paper’s lead author, Colin Dundas of the U.S. Geological Survey’s Astrogeology Science Center. His emailed comments are most interesting.
» Read more

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Telescope store sues Asian telescope manufacturers for fixing prices

11:21 am

A San Francisco store that sells telescopes to the public is suing two Asian telescope manufacturers — who make almost all recreational telescopes sold in the U.S. — for conspiring together to fix prices and create that monopoly.

Orion Telescopes and Binoculars, which is headquartered in Watsonville and has stores there and in Cupertino, is seeking more than $180 million in damages in a lawsuit. A federal court in Northern California said the complaint against telescope maker Ningbo Sunny, filed in 2016, can go to trial. A subsidiary of Ningbo Sunny, a Chinese company, bought Irvine telescope maker Meade Instruments in 2013.

In the complaint, Orion alleges that Ningbo Sunny and a Taiwanese telescope manufacturer, Synta Technology, shared confidential information that competitors normally would not share, including product pricing, order forecasts and credit arrangements.

My question is this: Why are no American telescope manufacturers competing in this market? Are our labor costs too high? Our government regulations too restrictive? A little bit of competition could easily end this collusion by these Asian manufacturers, assuming it is happening.

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Amazon to build its own giant satellite constellation

10:25 am

Capitalism in space: Amazon has officially joined the race to build own giant satellite constellations for providing internet access worldwide.

[They] plan to put 3,236 satellites in low Earth orbit — including 784 satellites at an altitude of 367 miles (590 kilometers); 1,296 satellites at a height of 379 miles (610 kilometers); and 1,156 satellites in 391-mile (630-kilometer) orbits.

In response to GeekWire’s inquiries, Amazon confirmed that Kuiper Systems is actually one of its projects. “Project Kuiper is a new initiative to launch a constellation of low Earth orbit satellites that will provide low-latency, high-speed broadband connectivity to unserved and underserved communities around the world,” an Amazon spokesperson said in an emailed statement.

The competition now includes Amazon, SpaceX, OneWeb, and others, each of which will provide a lot of business for the launch industry. All told, more than 15,000 satellites will need to be launched by these companies before the middle of the next decade.

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Curiosity films partial solar eclipses by both Phobos and Deimos

10:15 am

Phobos partial eclipse of Sun

Last week Curiosity successfully captured partial solar eclipses by both Phobos and Deimos as the Martian moons crossed the face of the Sun.

The movie on the right shows Phobos eclipsing the Sun. The speed is ten times faster than real time.

The press release can be seen here. It notes how these observations, of which 8 in total have been made since Curiosity arrived on Mars, have helped pin down the orbits of both moons.

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