Tag: spaceflight

Update on the Parker Solar Probe

8:49 am

Link here. The press release notes that the spacecraft’s instruments are one by one being made operational without problem and that it has also successfully completed a second course adjustment.

The release also provided a link to a page which will shows the probe’s present location. This is useful, as it also shows the probe’s position in relation to the Sun, Venus, and the Earth.

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Curiosity to drill twice more on Vera Rubin Ridge

3:45 pm

Before they will resume the journey up Mount Sharp the Curiosity science team now plans two more drilling attempts on Vera Rubin Ridge.

The rover has never encountered a place with so much variation in color and texture, according to Ashwin Vasavada, Curiosity’s project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California. JPL leads the Mars Science Laboratory mission that Curiosity is a part of.

“The ridge isn’t this monolithic thing — it has two distinct sections, each of which has a variety of colors,” Vasavada said. “Some are visible to the eye and even more show up when we look in near-infrared, just beyond what our eyes can see. Some seem related to how hard the rocks are.”

Part of this drilling campaign will also include gaining a better understanding better their improvised drilling technique.

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More details about Chinese suborbital launch earlier this week

9:56 am

Link here. The article really only provides one new detail about the flight itself, that the rocket used solid rocket motors. This fact, plus the overall secrecy, suggest to me that the company, iSpace, is doing its work for the Chinese military.

The article at the link also provides a good overview of the entire Chinese “private” smallsat rocket industry.

China is still run from the top, so any “private” rocket company must have the approval and support of the government. What makes China different from Russia, also ruled from the top, is the Chinese government’s willingness to encourage competitive independent operations, something the Russians has not done. The result is that China’s rocket industry is not stagnating, but growing.

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“Unsteady hand” drilled hole in Soyuz

9:34 am

According to reports in Russia today, Roscosmos head Dmitri Rogozin suggested earlier this week that an “unsteady hand” had made several attempts to drill a hole in the Soyuz capsule.

“There is another version that we are not ruling out; that this was done deliberately in space,” Russian news agency RIA Novosti quoted Rogozin saying.

He indicated there were “several attempts to use a drill” by an “unsteady hand,” scraping the metal areas surrounding the hole, according to RIA Novosti. “We can cut short the idea that this was a technological mistake made by some specialist or other,” he added.

The vision that immediately came to my mind was that of a drunk technician, unhappy about pay, bad living conditions, and corruption, stumbling into the capsule, drilling the hole. Later, after he sobered up he realized the disaster he had created for himself and tried to fix it secretly.

Then again, it is dangerous to take seriously anything Dmitri Rogozin says. He could be trying to spin the situation to his advantage.

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Saturn’s polar hexagonal vortex might tower high above clouds

3:35 pm

The uncertainty of science: A long term analysis of data from the probe Cassini suggests that Saturn’s north polar hexagonal vortex might tower many miles high above the planet’s clouds.

A new long-term study has now spotted the first glimpses of a northern polar vortex forming high in the atmosphere as Saturn’s northern hemisphere approached summertime. This warm vortex sits hundreds of kilometres above the clouds, in a layer of atmosphere known as the stratosphere, and reveals an unexpected surprise. “The edges of this newly-found vortex appear to be hexagonal, precisely matching a famous and bizarre hexagonal cloud pattern we see deeper down in Saturn’s atmosphere,” says Leigh Fletcher of the University of Leicester, UK, lead author of the new study.

“While we did expect to see a vortex of some kind at Saturn’s north pole as it grew warmer, its shape is really surprising. Either a hexagon has spawned spontaneously and identically at two different altitudes, one lower in the clouds and one high in the stratosphere, or the hexagon is in fact a towering structure spanning a vertical range of several hundred kilometres.”

There are many uncertainties here. For one thing, we have not yet even observed Saturn from up close through a complete year. We might be seeing random weather events having nothing to do with the gas giants overall planetary weather patterns.

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Roscosmos re-inspecting all Progress/Soyuz capsules

9:48 am

The Russians are going to give all Progress and Soyuz capsules being prepared for launch a new inspection following the discovery that the airleak on the Soyuz docked with ISS had been caused by a technician on the ground prior to launch and covered up.

The consequences to Russia’s space industry because of this incident are going to be difficult to measure. It surely signals that they have still not got a handle on their quality control problems. In fact, it provides further proof that the technical work coming out of Russia is shoddy, sloppy, and filled with many forms of corruption, all circumstances that should give pause to anyone thinking of flying a product or themselves on a Russian-made product.

Worse, the centralized government-run space industry created by Putin is exactly the wrong thing for fixing these problems. Russia does not have a competitive and free aerospace industry. Everything is run by the government and based on the ability to wield political power rather the ability to demonstrate skill and quality in how you do your job.

With only five launches expected in 2019, Russia’s space program is sinking to the level of a third world country. This airleak disaster will only help it sink further.

One last note: I predicted this kind of disaster back in 2013, when the consolidation of Russia’s aerospace industry was announced by the Putin government. My prediction was not very difficult, nor especially brilliant, since disasters like this always occur from government-run top-down socialist/communist systems. One only has to be patient. It is only a matter of time before the system fails, and fails badly.

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ISS airleak an accidental drill hole on ground

5:21 pm

The airleak last week on ISS in the orbital module of a Soyuz capsule was not caused by a micrometeorite but by an accidental drill hole made by a technician on the ground who then, rather than reporting it, sealed it and covered it up..

“The hole was made on the ground. The person responsible for the act of negligence has been identified,” the source told the news agency.

Another source said a worker apparently accidentally drilled the hole, but instead of reporting it, simply sealed it. The sealant held for at least the two months the Soyuz spacecraft spent in orbit, before finally drying up and being pushed out of the hole by air pressure.

According to a Moskovsky Komsomolets report, the hole was located near the toilet and covered by decorative fabric. The Russian crew members used an epoxy-based sealant with metallic additives to plug both the hole and a fracture in the outer hull of the Soyuz located behind it, the newspaper said.

Well, if anything is going to put an end to the resistance to using privately built American manned capsule, this should do it. This is also going to do a great deal of harm to the Russian desire to sell tourist seats on their Soyuz.

Posted from Heber, Arizona.

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UAE names the two finalists for its first manned flight on Soyuz

9:15 am

The new colonial movement: The leader of Dubai yesterday named the UAE’s the two astronaut finalists, one of which will fly on a Soyuz to ISS sometime next year.

The ruler of Dubai has announced the names of two astronauts from the United Arab Emirates who will be heading to the International Space Station, a first for the Gulf nation. Sheikh Mohammed bin Rashid Al Maktoum, who also serves as the UAE’s vice president and prime minister, made the announcement on Monday on Twitter.

Sheikh Mohammed named the astronauts as Hazza al-Mansouri and Sultan al-Nayadi. Their missions are scheduled for next year.

No biographical information about these two men has yet been released, but I am willing to bet that some UAE politics played a part in their selection. This is not to say that they are unqualified (because both men were cleared to fly by the Russians) but to note the realities that always lurk within any government run space program.

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SpaceX’s Big Falcon Rocket and the colonization of Mars

7:49 pm

Link here. Lots of details about what SpaceX wants to do, as well as the company’s request for help in areas it is weak.

Below the fold is the youtube video from the Mars Society conference last week which forms the basis of the article at the link.

I only have one comment at this time: I worry that SpaceX is developing a rocket, the BFR, that has no marketable value, at this time. They succeeded with the Falcon 9 and the Falcon Heavy because they could market them and make money from them. The commercial space industry needed these rockets that could fly at lower cost, and that has paved the way for SpaceX’s success.

There are real questions whether a similar market exists for BFR. To paraphrase a line from the movie Field of Dreams, it is possible that if they build it the customers will come, but few businesses succeed with that market strategy.
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Russian official predicts only 10 launches for 2019-2020

9:24 am

How the mighty have fallen: A Russian official yesterday predicted that they will only do a total of 10 launches for the two year period from 2019 to 2020.

“Five launches are envisaged for 2019. Five launches of manned and resupply ships, and also of a nodal module are planned for 2020,” the vice-premier said at a meeting held at the Energia Rocket and Space Corporation on the problems of piloted cosmonautics in the process of fulfilling long-term space exploration programs. [emphasis mine]

The highlighted words reveal a second tidbit, namely that they apparently will not be launching the Nauka module to ISS in 2019, as previously announced.

In a related story, a Russian space official also confirmed that they will definitely cease flying American astronauts on Soyuz in April 2019, as per the NASA-Russian contract.

The second story does not mention the Soyuz flight seats that Boeing owns, obtained as part of the settlement of the Sea Launch partnership. I wonder about their status. Are the Russians going to block them? I also suspect that this second story might be a negotiating effort by the Russian government to press NASA into buying more flights, something NASA has so far not done.

Either way, the first story essentially places Russian in the bottom echelon of space-launch nations, ranking comparable to what India and Japan have been doing in recent years. Both these countries however expect to up their numbers, which makes Russia’s space future look even more dismal.

For the entire history of space, beginning with Sputnik, the Soviet Union/Russia had consistently dominated the world in annual launches. For them to have fallen so far tells us much about the failed socialist and centralized policies of the Putin government. They do not work. They never work. In fact, they cannot work.

Will someone please tell this fact to both the American Democratic Party, and the many people who continue to vote for its new socialist agenda?

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Some debate at NASA over Opportunity

8:58 am

This story yesterday had the following interesting paragraph:

Members of Opportunity’s engineering team recommended a different plan, the person close to the mission says. Their idea was to actively try to communicate with Opportunity until the end of January 2019 — the end of the seasonal cleaning period. After that, they suggested passive listening until the end of 2019. But these recommendations were ignored by management in order to save money, this person says, meaning the agency could be risking abandoning a still-functioning rover. The Opportunity team reportedly didn’t receive formal notice of the plan until “minutes before JPL published its press release,” according to The Atlantic.

It appears that some on the science team do not feel that the present plan to listen closely for only 45 days, through mid-October, is sufficient, as it will likely require a dust devil to clear Opportunity’s solar panels, and dust devil season will not begin until November.

However, it is very likely wrong to blame the resistance by NASA management to this plan solely to a desire to save money. There are other considerations, such as tying up the Deep Space Network for this one rover when, as I noted yesterday, the October to January time period will be a very very very busy time for that network, with many important new planetary probe events. Seven different spacecraft will either be landing or doing fly-bys on four different solar system targets during that time. Tying the network up to listen for Opportunity will likely not work.

It seems to me that Opportunity should be recovered, if possible, but it also must receive a lower priority during this time period. After New Horizons’ January 1st fly-by of Ultima Thule it might be possible to devote more time then to listening, but I can see the logic, at least in this context, for reducing the listening time from October to January.

Hat tip Kirk Hilliard.

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The upcoming very busy planetary probe season

12:08 pm

The next few months are going to be very busy and exciting for the planetary science community. Seven different probes will be either flying past or landing on four different solar system objects, with interesting events happening every few weeks:

  • September 21: One of Hayabusa-2’s mini-landers, Minerva-II-1, will land on the asteroid Ryugu
  • October 3: Another Hayabusa-2 mini-lander, MASCOT, will land on Ryugu
  • Late October: Hayabusa-2 itself will land and grab a sample of Ryugu
  • November 26: The U.S. lander InSight will land on Mars.
  • December 3: OSIRIS-REx will arrive at the asteroid Bennu.
  • December: Chang’e-4 will land on the Moon’s far side.
  • January 1: New Horizons will fly past the Kuiper Belt object Ultima Thule.

In addition, another Hayabusa-2 mini-lander will also land on Ryugu, sometime after Hayabusa-2’s landing. Moreover, as OSIRIS-REx and New Horizons approach their targets we shall see daily new and increasingly sharper images of both Bennu and Ultima Thule, prior to their arrival.

I expect from September to January there will be many many very cool images coming from space, on almost a daily basis.

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How the Curiosity science team found soft rock for drilling

10:15 am

Link here. They very much wanted drill samples on Vera Rubin Ridge, but had twice found the rock too hard for Curiosity’s drill. So how did they pinpoint the spot, dubbed Stoer, where the drill finally worked?

In the absence of direct data on rock mechanical properties, we came up with three criteria that we could use to try to find a softer rock. (1) Did the bristles of the DRT brush leave scratches on the rocks’ surfaces? While not necessarily a direct indicator of what the rock strength would be when we drilled into it, we could at least say rocks that got scratched with the DRT had a softer surface than those that didn’t. (2) How well exposed are the white calcium sulfate veins? On some rock targets, like Stoer, we clearly see veins. On other targets, like Voyageurs, the veins are recessed into the rock. Recessed veins erode much faster than the surrounding bedrock because the surrounding bedrock is harder. Non-recessed veins tells us the bedrock may be similar in strength to the veins, or, if the veins stick out, the bedrock may be lower in strength. (3) What does the large-scale topography tell us? Broadly, Vera Rubin Ridge is a ridge because it is composed of hard rocks that are more resistant to erosion than their surroundings. We realized we might use this same logic to find softer rocks within the ridge by trying to drill in local topographic lows or at bases of scarps where the bottom of the scarp is eroding more quickly than the hard rocks on top.

The successful drill hole, Stoer, was thus down somewhat from to top of the ridge. As they prepare to move on, it appears they want to try again to drill at the top of the ridge. It also appears that the work described above has maybe found another location there where the rock might be soft enough for the drill.

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As Mars dust storm clears, Opportunity remains silent

10:04 am

The Opportunity science team today provided a new update on the rover, noting that it remains silent even as the Martian dust storm is clearing.

With skies clearing, mission managers are hopeful the rover will attempt to call home, but they are also prepared for an extended period of silence. “If we do not hear back after 45 days, the team will be forced to conclude that the Sun-blocking dust and the Martian cold have conspired to cause some type of fault from which the rover will more than likely not recover,” said Callas. “At that point our active phase of reaching out to Opportunity will be at an end. However, in the unlikely chance that there is a large amount of dust sitting on the solar arrays that is blocking the Sun’s energy, we will continue passive listening efforts for several months.”

The additional several months for passive listening are an allowance for the possibility that a Red Planet dust devil could come along and literally dust off Opportunity’s solar arrays. Such “cleaning events” were first discovered by Mars rover teams in 2004 when, on several occasions, battery power levels aboard both Spirit and Opportunity increased by several percent during a single Martian night, when the logical expectation was that they would continue to decrease. These cleaning dust devils have even been imaged by both rovers on the surface and spacecraft in orbit (see https://mars.nasa.gov/resources/5307/the-serpent-dust-devil-of-mars/).

It appears however that if nothing is heard from Opportunity by sometime in mid-October, they will be very prepared at that time to begin shutting down ground-based operations here on Earth.

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Scotland’s first commercial rocket test flight

9:34 am

Capitalism in space: A private smallsat rocket company, Skyrora, has successfully completed a suborbital test flight, the first commercial rocket test flight in Scotland.

Skyrora saw its 2.5 metre (9ft) projectile reach altitudes of almost four miles after taking off at the Kildermorie Estate in Ross-shire. Known as Skylark Nano, it accelerated to Mach 1.45 – more than 110mph.

One could also describe Skylark Nano as nothing more than a big model rocket. Nonetheless, the company is using this test flight to improve its chances to win the competition for some of the money the UK government will award to private companies in connection with the establishment of its new spaceport in Sutherland, Scotland.

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Dates set for first landings on Ryugu

9:10 am

The science team for the Japanese probe Hayabusa-2 have set the dates for the first two landings on the asteroid Ryugu.

On 21 September, it will despatch the first of these piggybacked packages. A 3.3kg container known as Minerva II-1, which is mounted on the spacecraft, will deploy two robots known as Rover 1A and Rover 1B.

The 1kg “rovers” will actually move by hopping under the asteroid’s low gravity. Each one contains a motor-powered internal mass that rotates to generate force, propelling the robot across the surface. The rovers are equipped with wide-angle and stereo cameras to send back pictures from Ryugu.

Then, on 3 October, the mothership will deploy a lander called Mascot, which has been developed by the German Aerospace Center (DLR) in conjunction with the French Space Agency (CNES). Mascot, otherwise known as the Mobile Asteroid Surface Scout, is a 10kg instrument package that will gather a range of scientific data from the surface. It carries a wide-angle camera, a microscope to study the composition of minerals, a radiometer to measure temperature and a magnetometer to measure the magnetic field.

After it reaches the surface, Mascot can move its position only once, by jumping.

An earlier report had said that Hayabusa-2 would itself land late in October, but this report today leaves that landing date unstated.

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First private patents filed for manufacturing materials on ISS

10:36 am

Capitalism in space: Two private companies, Proctor & Gamble and Made in Space, have filed the first private patents for the manufacture of either materials or supplies on the International Space Station.

These patents are very important, as they specifically describe doing manufacturing in space of objects that can be used in space. There have been many previous patents for research in space, but all have usually related to research for use on Earth.

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Air leak on ISS

10:17 am

An air leak on ISS was detected yesterday, and pinpointed to cracks found in the spherical habitation module of one of the Soyuz capsule’s docked to the station.

According to Russian sources, the problem was found in the Habitation Module of the Soyuz MS-09 spacecraft, where the crew detected two small cracks, reaching 1.5 millimeters in size. Alexander Gerst apparently first discovered the leak.

The cosmonauts photographed the affected area and sent it to mission control for analysis. The first estimates indicated that the holes could be caused by meteor or debris strikes which punctured the hull of the spacecraft. Head of the Roskosmos State Corporation Dmitry Rogozin confirmed the incident but said that the problem had been resolved. According to Rogozin, the crew had to close off various sections of the station to isolate the leak.

According to ESA sources, the area of the leak was temporarily sealed with tape, while Russian cosmonauts were working on a permanent sealing patch. After some drop during the night, the air pressure inside the ISS was reported as stable near sea level. In the meantime, mission control informed the crew that all scheduled activities for August 30 had been cancelled.

The cracks do not pose a problem for using the Soyuz for returning to Earth, as the habitation module is discarded before de-orbit. The descent module appears unharmed.

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The aurora of Saturn

10:11 am

Cool movie time! Using the Hubble space telescope scientists have compiled an animation showing the changes in Saturn’s north pole aurora over time.

In 2017, over a period of seven months, the NASA/ESA Hubble Space Telescope took images of auroras above Saturn’s north pole region using the Space Telescope Imaging Spectrograph. The observations were taken before and after the Saturnian northern summer solstice. These conditions provided the best achievable viewing of the northern auroral region for Hubble.

…The images show a rich variety of emissions with highly variable localized features. The variability of the auroras is influenced by both the solar wind and the rapid rotation of Saturn, which lasts only about 11 hours. On top of this, the northern aurora displays two distinct peaks in brightness — at dawn and just before midnight. The latter peak, unreported before, seems specific to the interaction of the solar wind with the magnetosphere at Saturn’s solstice.

The animation of all the images is embedded below. At the link is a second video showing the aurora in close-up

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Lunar scientist Paul Spudis had passed away

10:03 am

R.I.P.: Paul Spudis, lunar scientist and strong advocate for the human exploration of space, passed away yesterday at the age of 66.

Spudis was one of the best lunar scientists we have had. He also saw past petty budget battles and his personal planetary research to recognize the need for human exploration and settlement on the Moon and elsewhere. This is a premature loss for us all.

Leonard David at Space News has written a fine obituary, which gives only a hint at how important Spudis was to the recent resurgence of the U.S. in the exploration of space.

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Looking for Marsquakes

1:24 pm

After eight and a half years of study of one particular very young fault system on Mars using high resolution images from Mars Reconnaissance Orbiter, scientists have found no evidence that any quakes occurred there in that time.

The team studied images of Mars’s surface over nearly a decade to look for changes that might have been caused by marsquakes. The researchers used images of Mars’s surface from the High Resolution Imaging Science Experiment (HiRISE) and applied Co-registration of Optically Sensed Images and Correlation (COSI-Corr)—software that has been validated to track terrestrial glaciers, landslides, and quakes on Earth, as well as dune movement on Mars itself—to hunt for signs of displacement near fault zones.

The researchers focused on the Cerberus Fossae fault system, the youngest fault system on the Red Planet and thus the most likely to still be active. They used the average coregistration performance of each study image to determine that this method should be able to detect fault slip rates of 0.1–10 millimeters a year.

The team identified only one displacement signal that could have been interpreted as evidence of a marsquake—but dismissed it as the result of a topographic artifact. Their results suggest that no seismic movement occurred in the Cerberus Fossae area over the course of the study, which spanned 8.5 Earth years’ worth of images from the planet.

This suggests, but does not prove, that Mars has very few quakes. We shall know more when InSight lands on Mars on November 26.

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India’s manned flight schedule revealed

9:43 am

The new colonial movement: K. Sivan, the head of India’s space agency ISRO, announced yesterday the planned flight program that will lead up to that nation’s first manned spaceflight in 2022.

The Indian Space Research Organisation will conduct two flights of unmanned space capsules about 30 months and 36 months from now in preparation for the country’s first manned space mission by 2022, space agency officials announced on Tuesday.

The manned space capsule will be designed for a five-to-seven day mission about 300km to 400km above the Earth, officials said, adding that Isro has for over a decade been developing key technologies for human space flight.

Isro has designed a three-person space capsule but how many astronauts will be sent in the first mission has not been decided yet, they said. Only Russia, the US and China have until now sent astronauts into space aboard their own spacecraft.

This entire program hinges on the repeated successful use of India’s most powerful rocket, the GSLV Mark 3, which has only flown once so far. Two more launches are scheduled through January, including one that will take India’s first lunar lander to the Moon.

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Virgin Orbit performs more flight tests of 747

9:37 am

Capitalism in space: Virgin Orbit has completed a series of flight tests of the 747 airplane that will be used to launch its LauncherOne smallsat rocket.

The flights of the company’s Boeing 747 aircraft, nicknamed “Cosmic Girl,” were the first since the company installed a pylon on the plane’s left wing that will be used to carry the LauncherOne rocket on future flights of the air-launch system.

The company disclosed few details about the test flights, but flight tracking services such as Flightradar24 list three flights of the aircraft in recent days, most recently Aug. 27, taking off from the Southern California Logistics Airport in Victorville, California. The flights ranged in duration from one and a half to three and a half hours in airspace over the Mojave Desert and over the Pacific Ocean off the California coast.

The company appears to be making progress, though its also appears that their promised first rocket flights are not happening this summer, as previously announced.

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Launch schedule shuffles for SpaceX

9:29 am

Link here. A combination of payload issues, scheduling conflicts, and rocket refurbishment demands has forced SpaceX to shuffle and delay many of its remaining launches scheduled for the rest of 2018.

The biggest conflict appears to be between the first manned Dragon test flight, and the second Falcon Heavy flight, both of which are now listed for a November launch. Since both will use the same launchpad, there must be some space between them.

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Russian medics have approved UAE’s astronaut candidates

9:19 am

The new colonial movement: Russian medics have now narrowed the candidates for the United Arab Emirates’ (UAE) first spaceflight.

Nine candidates were sent to Russia for testing. The article does not say how many candidates were given medical clearance. Further training in September will narrow the choices further, followed by a final decision by the UAE naming the one person who will fly to ISS.

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Dragon/Starliner schedules firming up

9:11 am

At a meeting at NASA this week a status update of SpaceX’s manned Dragon and Boeing’s manned Starliner capsules indicated that their proposed flight schedules, with the first manned flights occurring next year, are increasingly firm.

Overall, the updates were quite positive with most of the flight hardware nearing completion. The two companies must each execute two test flights to the International Space Station (ISS) in order to be certified to perform operational crew rotation missions.

On the SpaceX side, the company will first execute an uncrewed test flight of the Crew Dragon spacecraft called Demonstration Mission 1 (DM-1) – currently scheduled for this coming November. It will then be followed by a crewed test flight designated Demonstration Mission 2 (DM-2). In between the two missions, SpaceX will also execute an in-flight abort test.

In terms of Boeing, they will perform an uncrewed Orbital Flight Test (OFT) with the CST-100 Starliner followed by a Crewed Flight Test (CFT). A pad abort test will be also conducted between the two missions.

While Boeing’s schedule for these flights is somewhat uncertain as they investigate the recent failure of several valves to close during an engine test, SpaceX’s schedule has become very solid. Assuming nothing goes wrong on the unmanned test flight in November and the in-flight abort test, they will fly humans in April, 2019.

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Scientist proposes aerobraking asteroids into Earth orbit

9:00 am

What could possibly go wrong? A scientist has proposed the use of the Earth’s atmosphere to aerobrake resource-rich asteroids into Earth orbit to make them easily available for mining.

In the new paper, Tan and colleagues propose using aerobraking to slow small asteroids enough that they don’t just shoot straight past Earth, but stay in orbit, where they could be mined for platinum or water. Those resources could then be taken to space stations to supply future missions or operations. Water, they write, could even be split into hydrogen and oxygen for fuel. All it would take is a precisely calculated push from an unmanned spacecraft, they report this month in Acta Astronautica.

And if the maneuver were done far enough from Earth—millions of kilometers, in most cases—it likely wouldn’t take much effort. That’s because a small push from far away would greatly change the angle of an incoming space rock’s path. Tan notes that each case would be different, depending on the trajectory of the target asteroid, and says that modifications might be necessary if the asteroid gets off track.

They propose doing this only with small asteroids, less than 100 feet in diameter.

I am sure my readers can outline the numerous problems with this proposal. From my perspective, the primary one is that it is almost impossible to predict the precise path of these kinds of asteroids. Their rotation and irregular shape combined with radiation pressure from the Sun tends to make their solar orbits somewhat chaotic and difficult to predict at the accuracy needed to safely nudge them into a close fly-by of the Earth.

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New Horizons snaps first picture of Ultima

8:48 am

It isn’t much more than a tiny moving dot across a sea of stars, but on August 16, 2018 New Horizons was able to capture its first series of images of its January 1st fly-by target, the Kuiper belt object they have nicknamed Ultima Thule.

This first detection is important because the observations New Horizons makes of Ultima over the next four months will help the mission team refine the spacecraft’s course toward a closest approach to Ultima, at 12:33 a.m. EST on Jan. 1, 2019. That Ultima was where mission scientists expected it to be – in precisely the spot they predicted, using data gathered by the Hubble Space Telescope – indicates the team already has a good idea of Ultima’s orbit.

Ultima was 100 million miles away at the time.

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The shift to smallsats by the U.S. military

10:05 pm

Link here. The story focuses on the first planned constellation of smallsats, hopefully set for launch by 2021.

[DARPA] has mounted a program called Blackjack, which aims to loft a network of 20 prototype spy satellites to low Earth orbit (LEO) in 2021. These craft will be incredibly cheap compared to the current crop: The goal is get each satellite built and launched for about $6 million, said Thomas, the Blackjack program manager.

Blackjack aims to meet this ambitious cost target by leveraging developments in the private space sector. Several companies plan to establish huge constellations in LEO in the next few years, to deliver cost-effective internet service to people around the globe. SpaceX’s Starlink network, for example, will feature thousands of individual satellites.

Blackjack will integrate reconnaissance and communications payloads into standard commercial satellite bodies (known as buses) and take advantage of the high launch rate required to loft the mega-constellations, Thomas said. “The Blackjack approach assumes that we’re not going to be an anchor tenant. We’re not going to be driving these companies,” he said during the FISO presentation. “But we want to take advantage of that production line of spacecraft, the buses especially, that they’re going to be building. We want to take advantage of that launch and take advantage of all of those pieces.”

There’s a lot more at the link. If this first constellation works out, they will upgrade it to a constellation of 90 satellites. And it will based on buying the bulk of its product from the private sector instead of having the military build it. This will provide a wealth of business for smallsat manufacturers as well as smallsat rocket companies.

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