Category: Points of Information

Very brief descriptions, with appropriate links, of current or recent news items.

Orbital ATK gets its second contract for its satellite repair robot

11:09 pm

Capitalism in space: Orbital ATK has signed a second contract to build another Mission Extension Vehicle (MEV), designed to robotically extend the life of old but usable satellites.

The vehicle was ordered by Intelsat S.A. to provide life extension services for an Intelsat satellite. Orbital ATK is now producing MEV-1, the industry’s first commercial in-space satellite servicing system, for Intelsat with launch scheduled for late 2018. Under this new agreement, Orbital ATK will manufacture, test and launch MEV-2 and begin mission extension services in mid-2020. The production of the second MEV is part of Orbital ATK’s longer-range plan to establish a fleet of in-orbit servicing vehicles that can address diverse space logistics needs including repair, assembly, refueling and in-space transportation.

“Work on MEV-1 is progressing rapidly toward a late 2018 launch with system-level testing beginning this spring,” said Tom Wilson, President of Orbital ATK’s Space Logistics, LLC subsidiary. “With the launch of MEV-2, Orbital ATK will continue to pioneer in-space satellite servicing for commercial operators. Intelsat’s commitment to a second MEV demonstrates not only the market demand for our servicing vehicles, but also the customer’s confidence in our product.”

Through its Space Logistics subsidiary, Orbital ATK will introduce in-orbit commercial satellite servicing with MEV-1 late this year. The MEV is based on the company’s GEOStarTM spacecraft platform, and controlled by the company’s satellite operations team. The MEV uses a reliable, low-risk docking system that attaches to existing features on a customer’s satellite, and provides life-extending services by taking over the orbit maintenance and attitude control functions of the client’s spacecraft. Each MEV vehicle has a 15 year design life with the ability to perform numerous dockings and repositionings during its life span.

What Orbital ATK here is doing is creating a entirely new cottage industry with the satellite industry, providing satellite companies an inexpensive way to maintain their satellite networks without building and launching a whole new communications satellite. Once Orbital has placed a number of these in orbit, they will be available to move from satellite to satellite. Once their first repair job is finally finished, they will then move on to another at relatively little cost.

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Nigeria signs deal with China for two communications satellites

9:16 am

China has agreed to build for Nigeria two communications satellites, with the $550 million fee paid entirely for Nigeria through an arrangement with China’s EXIM Bank.

The China EXIM Bank and a Chinese firm, the China Great Walls, have agreed to pay the entire $550m to procure two new satellites for the Nigerian Communications Satellite Limited. The Minister of Communications, Adebayo Shittu, disclosed this in an interview with State House Correspondents on Wednesday shortly after a meeting he had with President Muhammadu Buhari at the Presidential Villa, Abuja.

Shittu explained that the initial arrangement was that Nigeria would provide 15 per cent counterpart funding for the two satellites, while the bank and the firm would provide the balance. He said Nigeria, however, decided to renegotiate the deal when it became obvious that the country could not afford the counterpart funding. The minister explained, “Because we could not afford this 15 per cent, we have renegotiated with the China EXIM Bank and the China Great Walls, who are the manufacturers, and they have happily agreed to pay the entire $550m to procure two new satellites.

Essentially, this is foreign aid from China to Nigeria, and follows a pattern China has used recently in providing space-related foreign aid in other circumstances.

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Justice Dept to provide House Russian probe documents

9:25 pm

This could get very interesting: The Department of Justice has reached an agreement with the House to provide a variety of long requested documents connected with the department’s investigation on whether the Russians interfered with the 2016 election.

The deal was reached after FBI Director Chris Wray and Deputy Attorney General Rod Rosenstein made a surprise visit to House Speaker Paul Ryan It was announced by House Intelligence Committee Chairman Devin Nunes, who had sought the information and threatened more drastic action if his panel continued to be denied access to the information. “After speaking to Deputy Attorney General Rosenstein this evening, I believe the House Intelligence Committee has reached an agreement with the Department of Justice that will provide the committee with access to all the documents and witnesses we have requested,” Nunes said in a statement. “The committee looks forward to receiving access to the documents over the coming days.”

Nunes has in recent months lashed out against the DOJ over its failure to respond to requests for the documents, suggesting the department was doing so deliberately. “At this point it seems the DOJ and FBI need to be investigating themselves,” Nunes wrote in a letter to Rosenstein last week.

What puzzles me is how long the Trump administration allowed the Trump Justice department to stonewall House investigators. Trump is legally in charge. The people at Justice work for him. Either Trump was involved with the Russians somehow and was stonewalling to protect himself, or he allowed Obama appointees to run things there for way too long. This agreement suggests the latter, assuming it is what the article says it is.

Either way, should House investigators get the documents they want, it could very well blow apart the Mueller investigation, based on everything I have read recently. There really does not appear to be anything of substance in the “Russian” scandal, except what appears to be a conspiracy in Justice by those who opposed Trump, a legally elected president, to harm him enough to get him overthrown.

And that could be the biggest scandal we have seen in Washington ever, even worse than Watergate.

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A faint seasonal fluctuation of methane on Mars?

8:23 pm

The uncertainty of science: Data from Curiosity during its two Martian years on Mars have revealed a faint but distinct seasonal fluctuation in the amount of methane in the local atmosphere, a fluctuation that scientists do not have a good explanation for.

Since landing in 2012, Curiosity has on 30 occasions opened a few valves to the martian night and taken a sniff of the thin, frigid air. In a small, mirrored chamber, it shines a laser through the air sample and measures the absorption at specific wavelengths that indicate methane. At the meeting, Webster reported vanishingly small background levels of the gas: 0.4 parts per billion (ppb), compared with Earth’s 1800 ppb.

Where that whiff comes from is the heart of the mystery. Microbes (including those that live in the guts of cows and sheep) are responsible for most of Earth’s methane, and Mars’s could conceivably come from microbes as well—either contemporary microbes or ancient ones, if the methane they produced was trapped underground. But methane can also be made in ways that have nothing to do with biology. Hydrothermal reactions with olivine-rich rocks underground can generate it, as can reactions driven by ultraviolet (UV) light striking the carbon-containing meteoroids and dust that constantly rain down on the planet from space.

Now, add to the methane puzzle the seasonal variation Curiosity has detected, with levels cycling between about 0.3 ppb and 0.7 ppb over more than two martian years. Some seasonality is expected in an atmosphere that is mostly carbon dioxide (CO2), says François Forget, who models the climate of Mars at the Laboratory of Dynamical Meteorology in Paris. In the southern winter, some of that CO2 freezes out onto the large southern polar cap, making the overall atmosphere thinner. That boosts the concentration of any residual methane, which doesn’t freeze, and by the end of northern summer this methane-enriched air makes its way north to Curiosity’s location, Forget says. Seasonal variations in dust storms and levels of UV light could also affect the abundance of methane, if interplanetary dust is its primary source.

But, Webster said at the meeting, the seasonal signal is some three times larger than those mechanisms could explain. Maybe the methane—whatever its source—is absorbed and released from pores in surface rocks at rates that depend on temperature, he said. Another explanation, “one that no one talks about but is in the back of everyone’s mind,” is biological activity, says Mike Mumma, a planetary scientist at Goddard Space Flight Center in Greenbelt, Maryland. “You’d expect life to be seasonal.”

They have a lot of theories, from asteroids to alien life, but none really explains this adequately.

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Was the solar system formed inside a giant bubble?

10:28 am

Don’t bet the house on this! Astronomers have come up with a new theory for the formation of the solar system, that it was formed inside a giant bubble inside a Wolf-Rayet star, in order to explain the known ratios of certain isotopes here.

The new theory for how the solar system formed starts with an extremely massive star known as a Wolf-Rayet star. Of all the stars in the universe, these stars burn the hottest. Because they are so hot, they also have exceptionally strong stellar winds.

As a Wolf-Rayet star sheds its outer layers – a normal end-of-life process for a giant star – its strong stellar winds plow through its loosely held cloak of material, forming densely shelled bubbles. According to the study, the solar system could have formed inside of one of these bubbles.

While this theory would explain a number of mysteries about the ratios of aluminum-26 and iron-60 in our solar system, which correspond closer to those in a Wolf-Rayet star than the galaxy itself, it is quite far-fetched. More hard data is necessary, including real evidence of such things actually happening in such stars, before it can be taken very seriously.

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New data from Tabby’s Star suggests that dust, not alien megastructures, is the cause of its dimming

8:39 am

New observations of Tabby’s Star now suggests that it is dust, not alien megastructures, that has caused the star’s erratic fluctuations in dimming over the past century.

“Dust is most likely the reason why the star’s light appears to dim and brighten. The new data shows that different colors of light are being blocked at different intensities. Therefore, whatever is passing between us and the star is not opaque, as would be expected from a planet or alien megastructure,” said [LSU Department of Physics & Astronomy Assistant Professor Tabetha Boyajian].

Though the data appears strong, it still leaves astronomers a bit baffled about how dust could cause the particular dimming they have seen.

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A short dose of ultraviolet light might save North America’s bats

8:24 am

Researchers have found that the fungus that has been decimating bat populations in the eastern United States for the past decade is easily killed by a short dose of ultraviolet light.

Upon being compared to six non-pathogenic Pseudogymnoascus species, it was found that P. destructans lacks a key enzyme that allows it to repair DNA damage caused by ultraviolet light. When samples of the fungus were exposed to a low dose of UV-C light from a handheld source, the survival rate was only about 15 percent – this dropped to less than 1 percent when the dose was moderate. In both cases, the duration of exposure was a matter of no more than a few seconds.

Next comes a control group experiment. If this proves true, than it might be possible to safely sterilize both bat populations and caves of the fungus. To work, however, the task will likely require repeated yearly visits to bat hibernation sites to kill the fungus before it causes the bats to wake up in the winter. Such visits have their own problems, and would be difficult to pay for. However, I am sure the caving community across the U.S. would be glad to volunteer for this effort, and could handle it.

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China aiming for more than 40 launches in 2018

8:18 am

The new colonial movement: As part of China’s continuing effort to establish itself as a major space power the country plans to launch more than 40 times in 2018, more than doubling its previous average yearly launch rate.

The China Aerospace Science and Technology Corporation (CASC), announced at a conference on January 2 that its 2018 work model includes 35 launches, underlining the return to flight of the heavy-lift Long March 5 rocket, the Chang’e-4 lunar far side mission and launches of Beidou navigation satellites as the major activities.

In addition CASIC, a defense contractor, missile maker and sister company of CASC, will carry out a number of missions through its subsidiary EXPACE, including launching four Kuaizhou-1A rockets within one week and the maiden flight of the larger Kuaizhou-11.

Landspace Technology, a Beijing-based private aerospace company, is also expected to debut its LandSpace-1 solid propellant rocket this year.

The existence of even one private rocket company in China surprises me.

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Sea Launch aims to resume flights by the end of 2019

8:42 am

Capitalism in space: S7 Group, the Russian company that now owns Sea Launch, has published a planned launch schedule beginning the end of 2019 with twelve launches planned through 2022.

They have also set up a permanent office in Long Beach, California, where the Sea Launch platform is based.

We shall see if this schedule holds. The successful launch last week of a Zenit rocket indicates that the company’s rocket is viable. The question is whether they have any customers yet.

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An educated perspective on on the Iran protests

8:34 pm

Link here. The author is a writer who has lived in Iran and seems very knowledgeable about the country and the specific cities where the protests are occurring. His comments about the city where the protests began, Mashad, are very revealing. They suggest that the Islamic mullahs that have been controlling Iran for the past few decades might have forgotten their base, and thus their base is now revolting.

He also notes this detail:

Now, there’s rioting in Qom. Qom is THE religious center for Shia Islam. Rioters burned a SEMINARY. Anti-mullah riots in Qom is a VERY BAD SIGN. That’s comparable to anti-Catholic riots in Vatican City. If you’re burning pictures of Khomeini and Khameini (two different people) in the religious center of Shia Islam… The Mullahs have lost their base and not just on the subject of payments.

So, this is, yeah, a very serious revolt. Not just some minor anti-government protests or some people arguing for better pay-offs. Posters weren’t being burned in Qom in the Green Revolution. (Which was very much centered on the middle class and students.) ‘Blue-collar’ protesters are chanting in favor of Reza Pahlavi, the guy who reestablished the Peacock Throne.

He also concludes by saying that if the mullahs do not stamp this revolt out soon this could very well end up to be a fight to the death.

Hat tip from reader Geoffrey Carman.

Update: More information here, including some details about why our mainstream press seems incapable of reporting on these protests with any knowledge or depth.

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Protests in Iran escalate

3:37 pm

The protests in Iran this week that began over food prices and unemployment have now escalated into protests calling for the overthrow of the Islamic regime.

We shall see if these protests result in anything, or will be successfully squelched by the regime, as it did to similar protests in 2009. One difference between then and now is the American president. Obama spent most of his administration making nice to the Iranians, hoping that would make them less radical. He thus did nothing to support the protests, and if anything indicated his support for the regime at that time. Trump appears to think such an approach to be a waste of time, and has already indicated that he is sympathetic to the protesters, not the Iranian leadership.

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Trump administration cancels $255 million of military aid to Pakistan

11:55 am

Related to Awan IT scandal? The Trump administration has canceled the last payment of $255 million of military aid to Pakistan, out of a total $1.1 billion package.

“The United States does not plan to spend the $255 million in FY 2016 in Foreign Military Financing for Pakistan at this time,” said a spokesperson of the President’s National Security Council in a statement to Hindustan Times. “The President has made clear that the United States expects Pakistan to take decisive action against terrorists and militants on its soil, and that Pakistan’s actions in support of the South Asia Strategy will ultimately determine the trajectory of our relationship, including future security assistance. The Administration continues to review Pakistan’s level of cooperation.”

The statement reflected and sealed the administration’s complete disillusionment with Pakistan, which had sought to brazenly disregard the explicit warnings issued by President Donald Trump personally and leading members of his cabinet, such as secretaries James Mattis and Rex Tillerson. “This could be the severest blow dealt to Islamabad by this administration if it indeed decided to withhold it,” said a leading US expert on Pakistan, who did not want to be identified. “There is more coming,” the expert added.

I am wondering if this action now might have some connection with the unfolding Imran Awan IT Congressional scandal. There is evidence there that Awan and his brothers were working with both Hezbollah and Pakistan to obtain classified information from the computers of congressional Democrats.

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Falcon Heavy on the launchpad

8:18 am

Capitalism in space: SpaceX has finally rolled the first Falcon Heavy rocket out to its launchpad in preparation for at least one static fire engine test prior to is first launch.

SpaceX engineers are expected to conduct a fit check and complete other tests at pad 39A this week, followed by a hold-down firing of all 27 first stage engines some time after New Year’s Day. The company has not set a target date for the Falcon Heavy’s first liftoff, but officials say the launch is targeted in January, some time after the hold-down hotfire test.

Should it launch successfully, the Falcon Heavy will be the most powerful rocket in the world.

Update: They have now lowered the Falcon Heavy to a horizontal position. I suspect that the raising and lowering were both part of the fit check tests, and that they will soon raise the rocket up again.

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Is Clinton a target of Trump’s order freezing foreign assets of “human rights abusers?”

1:20 pm

Link here. The executive order, quietly issued last week, froze the U.S. assets of 52 people, several of which have ties to the Clintons and the Clinton Foundation.

The article suggests this order might be the first shot across the bow by the Trump administration that it is going to go after the Clintons in connection with the Uranium One deal. I am not so sure about that specifically. However, the order does fit with Trump’s stated hostility to lobbists.

Last Week’s Executive Order could have serious implications for D.C. lobbyists who provide “goods and services” (e.g. lobbying services) to despots, corrupt foreign politicians or foreign organizations engaging in the crimes described in the EO. “Virtually every lobbyist in DC has got to be in a cold sweat over the scope of this EO,” said an attorney consulted in the matter who wishes to remain anonymous.

And because the phrase “person” means “an individual or entity” in the order – any US organization which merely employs a foreigner engaging in the listed offenses is also subject to frozen assets. “Consider, what would happen if Apple, say employed a foreign national who bribed a PRC official for government approvals? How about a hypothetical case of a company like Northrop or Boeing where an employee, or consultant, who is a foreign national bribes a Saudi official to direct government purchases of airplanes and military equipment?

Those lobbyists could include the Clintons, but I suspect the order will affect many smaller fish before it gets to them.

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Scientists catch a big volcano eruption on Io

9:12 am

Scientists reviewing twenty year old data from the Galileo orbiter that studied Jupiter and its moons in the 1990s have identified the most intense volcanic eruption yet found on Io.

While looking through the NIMS temperature data, Davies and his colleagues spotted a brief but intense moment of high temperatures that cooled oddly quickly. This signal showed up as a spike in heat from a region in the southern hemisphere called Marduk Fluctus. First, the researchers saw a heat signal jump to 4–10 times higher than background, or relatively normal, levels. Then just a minute later, the signal dropped about 20%. Another minute later, the signal dropped another 75%. Twenty-three minutes later, the signal had plummeted to the equivalent of the background levels.

This signature resembled nothing Davies had seen before from Io. The lava flows and lava lakes are familiar: Their heat signals peter out slowly because as the surface of a lava flow cools, it creates a protective barrier of solid rock over a mushy, molten inside. Heat from magma underneath conducts through this newly formed crust and radiates from Io’s surface as it cools, which can take quite a long time.

This new heat signature, on the other hand, represents a process never before seen on Io, Davies said: something intense, powerful, and—most important—fast.

There’s only one likely explanation for what the instruments saw, explained Davies, whose volcanic expertise starts here on Earth. Large, violent eruptions like those seen at Stromboli are capable of spewing huge masses of tiny particles into the air, which cool quickly.

The article makes it sound like we’ve never seen this kind of eruption on Io before, which isn’t really true. Such eruptions have been imaged, but this is the first time that infrared data of their temperature spike was captured, thus confirming its nature.

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First flights of commercial manned capsules in 2018

9:06 am

According to a NASA presentation last month, it appears that both SpaceX and Boeing are aiming to complete both their first unmanned and manned flights this coming year.

The schedules remain tight, but SpaceX plans to do its first unmanned demo mission in April, followed by a manned flight in August, while Boeing’s first unmanned flight is set for August, with the first manned flight in November. If these schedules happen 2018 should be quite an exciting year.

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Russian/Ukrainian Zenit rocket puts Angola’s first satellite into orbit

9:52 pm

A Ukrainian Zenit rocket with a Russian Fregat upper stage successfully launched Angola’s first communications satellite into orbit today. [Update: While the rocket succeeded, it appears there is a problem with the satellite, which Russia built for Angola. Engineers have lost contact with it.]

The launch occurred earlier today, but it took nine hours for the Fregat upper stage to complete several engine burns and maneuvers to place the satellite in the correct orbit. Considering that it was a Fregat upper stage that caused the launch failure of a Soyuz rocket last month, it seemed wise to wait for these maneuvers to complete successfully before announcing this launch a success.

That Russia and Ukraine worked together to make this happen is quite amazing, considering that the two countries are essentially still fighting a war against each other. It also indicates, as noted by this article, that the future of Zenit and the Ukrainian rocket industy might not be dead.

Angosat 1 was originally supposed to blast off on a Zenit rocket from Sea Launch’s commercial ocean-going platform in the Pacific Ocean. But Sea Launch flight operations ceased in 2014, and Russian officials considered launching Angosat 1 on the heavy-lift Angara 5 rocket before deciding last year to put the satellite on a fully-assembled Zenit booster already in storage at the Baikonur Cosmodrome.

At the time of the last Zenit launch in December 2015, there were no more missions on the Ukrainian-made rocket’s manifest, leaving the Zenit program’s future in question.

But with the switch of Angosat 1’s launch to a Zenit rocket, and the purchase of Sea Launch infrastructure mothballed in Long Beach, California, by a commercial Russian airline company, there are plans for the resumption of Zenit missions in the future. The new Sea Launch company, called S7 Sea Launch, ordered a dozen new Zenit launch vehicles from Yuzhmash in April for ocean-based missions and flights staged from the Baikonur Cosmodrome. Another Zenit rocket is slated to launch a long-delayed Ukrainian telecom satellite from the Baikonur Cosmodrome next year.

This launch also probably closes out the launch schedule for 2018, with the standings as follows:

29 United States (including all companies)
20 Russia
18 SpaceX
17 China

Russia, China, and SpaceX have all indicated that they are aiming for a launch rate of about 30 launches per year. If that happens in 2018, we could see the most rocket launches next year since the late 1980s.

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Ringo Starr to be knighted

5:36 pm

Ringo Starr, who grew up in the poorest of situations and was so sickly that he ended up getting almost no education, will be knighted by the Queen of England in the coming year.

The article paints a great picture of Starr, who always came off as the nicest and most endearing Beatle, and whose abilities on the drums in many ways cemented the band’s musical style. What makes my heart sing about this story however was how it demonstrates that it is still possible in the English-speaking world to come from nothing and rise to greatness. Starr’s poor background could have led to any number of bad ends, but he instead chose to play drums, and ended up helping to change the world’s musical culture.

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India aims to double launches in 2018

4:39 pm

The new colonial movement: The head of India’s space agency ISRO said in a newspaper interview today that the agency hopes to more than double the number of launches it completes in 2018, increasing the number to between 10 to 12 launches from the four successful launches in 2017.

“We are targeting 10 to 12 launches next year. The communication satellite GSAT-6A and Chandrayaan-2 mission will be launched by GSLV-Mk-II rockets. The second mission of GSLV-Mk-III rocket with a communication satellite and the launch of navigation satellite also will take place next year”, Kiran Kumar explained.

The much-awaited Chandrayaan-2 mission could be launched in the second quarter of 2018. “The moon lander is ready for the mission and undergoing tests. The flight hardware is getting assembled and going through tests. We are targeting the second quarter of the next year for the launch”, the top scientist said.

The two GSLV launches are critical, as this larger rocket is needed for India to really compete in the international market.

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The SpaceX light show yesterday

9:12 am

Falcon 9 launch, December 22, 2017

Numerous news articles today have noted that last night’s launch by SpaceX of ten Iridium satellites produced a somewhat unusual light show for Californians. Reader Frank Kelly sent me some images he took, noting,

I was able to catch the booster ascent, stage separation, second stage burn and what looks like the booster spinning with at least one engine firing. The spinning went on for a while so it must have had some fuel left.

I read SpaceX said they would not land this booster so maybe they had some fun with it for us folks in LA. It spun around for a minute like a pinwheel. A great show.

close-up of first stage maneuvers

The image above right is one of his images, reduced in resolution to post here. Below that is a cropped section of the full resolution image, showing the “pinwheel” being performed by the first stage. And as other readers of BtB have also noted, the launch crew was clearly performing engine tests and maneuvers with this first stage, all the way down to the ocean.

As is typical of SpaceX, they waste no opportunity to test their equipment and find out what it can do, on the extreme. I suspect these maneuvers were designed to push the first stage’s ability to recover from an out-of-control spin. From the call-outs by engineers during the launch, it appears that this test was a success, as it appears from those call outs that the first stage “landed” properly upright in the ocean.

Let me add that in reviewing some of the youtube videos posted by my readers in the comments below, I also think these first stage maneuvers might be tests in preparation for the first Falcon Heavy launch, which will involve landing three first stages at the same time, two landing very close together at Kennedy. The flight tests yesterday could be an effort to demonstrate how well they can program those first stages for their return.

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SpaceX successfully launches 10 Iridium satellites

7:45 pm

Capitalism in space: SpaceX today successfully launched ten 10 Iridium satellites.

This launch for Iridium reused a first stage from a previous Iridium launch. This was the first time Iridium launched with a used first stage. SpaceX did not try to recover the stage, which could be for several reasons, including the possible desire by the customer that they devote their entire effort to getting the satellites in orbit.

This was also SpaceX’s last launch for the year. The launch standings for the year now are thus:

29 United States
19 Russia
18 SpaceX
15 China

Sometime in the first week of 2018 I will post a full table showing this year’s launches plus the launch totals going back to the early 1980s. It reveals a great deal about the history of the launch industry for the past half century, as well as where that launch industry is likely heading in the coming half century.

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On the radio

3:11 pm

On Tuesday, December 19, 2017 I spent an hour with Robert Pratt on his Pratt on Texas radio show. Most of the show was devoted not to space and science but to discussing my weekly updates on the fascist culture on too many of today’s American campuses.

Robert has just let me know that this hour-long interview is going to be replayed twice over the next two weeks, on Christmas Day, December 25, 2017, and on New Year’s Day, January 1, 2018, both times from 6 to 7 pm Central time. He also let me know that the best link to listen is here.

So, if you have nothing better to do during these holidays, here is something that might help to fill your time.

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Arecibo returns to operation with images of asteroid Phaethon

10:02 am

The Arecibo Observatory in Puerto Rico has resumed science observations after recovering from Hurricane Maria with new radio images of the asteroid Phaethon.

After several months of downtime after Hurricane Maria blew through, the Arecibo Observatory Planetary Radar has returned to normal operation, providing the highest-resolution images to date of near-Earth asteroid 3200 Phaethon during its Dec. 16 flyby of Earth. The radar images, which are subtle at the available resolution, reveal the asteroid is spheroidal in shape and has a large concavity at least several hundred meters in extent near the leading edge, and a conspicuous dark, circular feature near one of the poles. Arecibo’s radar images of Phaethon have resolutions as fine as about 250 feet (75 meters) per pixel.

The images also revealed that Phaethon, which is considered a potentially hazardous near Earth asteroid, is about 3.6 miles across and is about a half mile larger than previously believed.

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