Tag: spaceflight

Opportunity to get a reboot

9:32 am

Because of an increasing number of computer resets on the Mars rover Opportunity, engineers plan to reformat the rover’s computer.

The resets, including a dozen this month, interfere with the rover’s planned science activities, even though recovery from each incident is completed within a day or two.

Flash memory retains data even when power is off. It is the type used for storing photos and songs on smart phones or digital cameras, among many other uses. Individual cells within a flash memory sector can wear out from repeated use. Reformatting clears the memory while identifying bad cells and flagging them to be avoided.

Obviously there is a risk, though small, that this action will not work and the mission will end here. Stay tuned.

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The decision on manned spaceflight

9:23 am

The rumors are swirling. Today alone the news included three different articles about NASA’s upcoming decision to down-select to either one or two in its manned commercial crew program.

The third article above speculates that the decision will be made shortly after this weekend, maybe as soon as next week. It also outlines in nice detail the companies who are competing for the contract.

I strongly expect NASA to pick two companies, not one, as the agency has repeatedly said it wants to have redundancy and competition in manned space flight. To this I agree whole-heartedly. Right now, if I was a betting man (which I am not), I would pick SpaceX and Sierra Nevada as the two companies to get the nod.

If NASA only picks one company that I don’t think there is much doubt that it will be SpaceX.

And then again, government agencies, because of politics, have sometimes made some incredibly stupid decisions. For example, back in the 1970s the company that proposed the space shuttle was rejected for another big space company that had more political clout, which then turned around and essentially stole the first company’s designs to build the space shuttle from them. It just took longer and cost more.

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The X-37B just keeps going.

2:56 pm

The Energizer bunny of space: The X-37B has now completed more than 600 days in orbit, with no indication when it will return to Earth.

The Air Force is believed to have only two X-37B space planes. These space planes have flown at otal of three missions, which are known as OTV-1, OTV-2 and OTV-3. (“OTV” is short for Orbital Test Vehicle.) The first mission blasted off in April 2010, and the craft circled Earth for 225 days. The second X-37B vehicle launched in March 2011, performing the OTV-2 mission. This spaceflight lasted 469 days, ultimately landing at Vandenberg Air Force Base in California in June 2012. That was the same landing site OTV-1 used after completing its mission.

The current OTV-3 mission is reusing the first X-37B space plane from the OTV-1 flight, showcasing the reusability aspect of the program.

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Single sensor caused Falcon 9R failure

9:21 am

SpaceX has identified the cause of the failure of last week’s Falcon 9R test flight failure as a single sensor.

On the Falcon 9R, there was no backup for this sensor, so the rocket was required to self-destruct when the sensor failed. On a Falcon 9, other sensors would have picked up the slack and the rocket would have continued in flight.

That the sensor is used by the Falcon 9, however, explains why they have delayed the next commercial flight. They probably want to make sure they understand why the sensor failed so they can reduce the chance of failure on the Falcon 9.

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SLS first launch officially delayed one year

3:18 pm

In a press conference today to tout the development of the SLS rocket, NASA finally admitted that the rocket’s first flight has been delayed a year until 2018, as had been rumored for months.

The cost? $7 billion more from now until that first launch, a number that does not include the billions already spent. I once again note that the entire commercial program, both manned and cargo, has cost less than that, from start to finish, and includes the entire manifest of actual cargo flights to ISS.

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Russian military abandons Rokot

9:35 am

Beginning in 2016, the Russian military will stop using its Rokot launcher, switching to Soyuz and Angara rockets instead.

The reason? Rokot relies on some imported parts, while Soyuz and Angara are build entirely in Russia.

It is interesting how fast the Russians are moving to stop their dependence on foreign parts, compared to the United States. Rather than try to build Russian-built parts for Rokot, they have taken the simplest and fastest approach and simply switched rockets.

In the U.S. Congress is instead demanding that a new rocket engine be build for Atlas 5 to replace the Russian engine, an expensive and time-consuming process. Wouldn’t it make more sense to say buy-buy to Atlas 5 and just switch to the Falcon 9?

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A tugboat for satellites

9:21 am

The competition heats up: An Israeli start-up is building a satellite tugboat that could be used to move stranded satellites to their proper orbits.

The planned satellite, once built and deployed, should be able to rendezvous with in-orbit satellites and propel them into new orbits, give them course corrections, or steer them towards what’s known as the “graveyard orbit” – a decommissioned satellite graveyard some 300km above their usual height of 36,000 kilometers over the equator. This fuel saving can extend a communications satellite’s life.

The company says its tugboat design could be a possible solution to two stranded Galileo Project satellites, now in possibly unusable orbits following a launch malfunction over the weekend.

The spacecraft would use an ion engine for propulsion.

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Rosetta’s camera zooms in

9:10 am

67P/C-G on August 23, 2014
Comet 67P/C-G as seen on August 23, 2014 from 38 miles.
Click on image for uncropped version.

The Rosetta team has begun releasing more close-up images of Comet 67P/C-G taken by the spacecraft. The image to the right was taken by the navigation camera, but rather than capture the entire nucleus in a single image the camera is now zoomed in and taking a mosaic of four images. This picture is one quarter of that mosaic.

Note the boulders and the sharp peaks in the image. The boulders are important to map for planning Philae’s landing site. The sharp peaks suggest recent outgassing.

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Antares to launch polar orbiting satellites?

3:00 pm

The competition heats up: Orbital Sciences expects within a year to get government approval to use its Antares rocket to launch sun-synchronous satellites from its launch facility at Wallops Island, Virginia.

Currently Antares is used to launch cargo resupply missions to the international space station, whose orbital inclination — the angle at which it passes over the equator — of 51.6 degrees dictates that the rocket follow a southeasterly flight path over the Atlantic Ocean. To reach high-inclination orbits, the vehicle would presumably need to fly more directly toward the equator.

Among the details to be settled is the exact configuration of the Antares rocket Orbital would use to place satellites into sun-synchronous orbits, which are commonly used for Earth observation missions. The Antares rockets flown to date have been two-stage vehicles, but the company offers three-stage versions for missions with more stringent orbital-insertion accuracy or high-energy requirements.

The issue here is making sure the rocket stays clear of population areas during launch. An almost due south launch path, needed for polar orbit from Wallops Island, would pass this test.

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Air Force hypersonic test ends in failure

9:59 am

The second test flight in an Air Force program to research hypersonic flight failed when its booster rocket was intentionally destroyed for safety reasons immediately after launch.

It was the second test of the Advanced Hypersonic Weapon, a program managed by U.S. Army Space and Missile Defense Command/Army Forces Strategic Command to develop a conventional deep-strike munition that travels through the atmosphere on a nonballistic trajectory. In its first flight, the vehicle lifted off from Pacific Missile Range Facility in Hawaii and flew a nonballistic, glide trajectory at hypersonic speeds toward the Reagan Test Site at Kwajalein Atoll — some 4,000 kilometers away — where it arrived about 30 minutes later.

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A new Falcon 1 to compete against SpaceX

9:28 am

The competition heats up: A rocket launch start-up created by former SpaceX engineers seeks to build their own Falcon 1 rocket for the small satellite market.

Their rocket, called Firefly, will use a number of new and old technological ideas. The highlighted words in this paragraph, however, stood out to me the most:

Just as Firefly is drawing on a lot of government research in its aerospike technology, the company is using a key element of the SpaceX Merlin engine—the pintle injector—in its new engine’s combustion chamber. Markusic, who jumped ship from NASA to SpaceX after the agency sent him to Kwajalein Atoll in the Marshall Islands to observe the first flight of the Falcon 1, says he started working on the technology—also used on the Apollo program’s lunar-descent engine —at SpaceX and when he was developing a liquid-fuel alternative to the hybrid engine used on Virgin Galactic’s SpaceShipTwo. [emphasis mine]

It only took one trip to see SpaceX in operation for this NASA engineer to become a former NASA engineer.

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Russia to continue on ISS past 2020?

9:03 am

A Russian news story today suggests that they are leaning strongly to continuing their partnership with the United States on ISS beyond 2020.

“The issue of Russia’s participation at the ISS after 2020 remains open, but there is a 90-percent chance that the state’s leadership will agree to participate in the project further,” [Izvestia] wrote, citing a source at Russia’s Federal Space Agency Roscosmos.

This report gives a better overview of the debate going on with Russia’s government and space agency. If they abandon ISS the work they have already done on new modules for the station will have to be written off, and it appears assembling their own station from those modules will be too expensive and take too long.

It also looks like NASA offered them a second year long mission if they stuck around.

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SpaceX delays commercial launch 24 hours

8:55 am

SpaceX has delayed its next commercial launch one day to Wednesday in order to make sure the issues that caused its Falcon 9R test rocket to self-destruct are irrelevant to the full Falcon 9 rocket.

Seems like a prudent decision that is also not overly timid. If this had been the NASA of the past few decades, they would have generally delayed the launch for far longer.

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Rosetta’s comet landing sites

8:48 am

67P/C-G landing sites

The Rosetta science team has narrowed the choices for Philae landing sites on Comet 67P/C-G to five, three on the smaller lobe and two on the larger lobe.

The smaller lobe sites, being on the outside surface of the lobe, don’t provide as good a view of the rest of the comet, while the larger lobe sites are on its inside surface, looking down at the neck and the smaller lobe. In addition, the terrain for the larger lobe sites looks to me more interesting.

Being on the inside surface, however, the larger lobe sites are going to be more difficult to land on.

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Picking a comet landing site

9:05 am

67P/C-G on August 22, 2014
Comet 67P/C-G as seen on August 22, 2014
from 40 miles. Click on image for full resolution.

Engineers have begun the landing site selection for Rosetta’s Philae lander.

This week, up to ten possible sites are being laid on the table for a first round of dedicated discussions and for the LCC and the SONC to carry out a technical analysis on each site, ready to be presented at the weekend meeting. Participants of the LSSG will then review the results from the technical analysis and discuss the scientific merits of the candidate sites. By the end of the weekend meeting, as many as five sites could be selected for further detailed investigation.

They will announce the five finalist sites on Monday.

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Soyuz puts two satellites in wrong orbit

5:55 pm

A Russian-made Soyuz rocket launched from French Guiana for Arianespace has placed two European Galileo GPS satellites into the wrong orbit.

Russianspaceweb suggests that the problem was caused by the rocket’s Russian Fregat upper stage. (Scroll down about halfway to read their report on this launch.)

Multiple independent sources analyzing the situation suggested that the Fregat upper stage had fired its engine for the right duration, however the stage’s orientation in space during the second or both maneuvers had probably been wrong. According to Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics and a veteran space historian, the Fregat’s angular orientation error during engine firing could reach as much as 145 degrees.

This failure is a triple whammy. It hits both Arianespace and Russia since the Soyuz was part of a partnership between the two. It also hits Europe’s Galileo GPS satellite, which after many years of development was beginning to move towards full operation.

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Sea Launch has suspended all operations until 2015

5:44 pm

Russian competition cools down: The mostly Russian-owned rocket company Sea Launch has suspended all operations until mid-2015.

I suspect that the Russian government, now in control of almost all Russian aerospace efforts, is not interested in building this company up as the rocket it uses is partly made in Ukraine and is a competitor to Russia’s new Angara rocket. Everything the Russian government has done for the past year has indicated a desire to shut down all cooperative efforts with other countries and focus everything towards all-Russian efforts.

Thus, Sea Launch dies.

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Falcon 9R destroyed during failed test flight

10:49 pm

In a test flight today of SpaceX’s Falcon 9R vertical take off and landing rocket the rocket was destroyed when ground controllers detected an “anomaly.”

Falcon 9R is a three engine version of the Falcon 9 first stage, designed to test designs for making that first stage capable of landing vertically. It has flown successfully a number of previous times, but this time it appears something was not quite right during the flight and ground controllers had to destroy it for safety reasons.

Is this a set back? Of course. Is it a failure? Not really, as it was a test flight of very cutting edge technology and even failures will teach you something to improve the engineering.

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A problem with drilling on Mars

9:07 am

In drilling a new hole while scientists considered Curiosity’s future route to Mount Sharp, the drill cut off operations prematurely.

Engineers think that the rock might have shifted during drilling, causing the robot rover to abort. They have ordered the rover to take a lot of pictures of the situation so they can figure out what happened.

I should note that engineers take a large risk every time they use Curiosity’s drill, as the design of the rover’s electrical system is such that the drill might short everything out while it operates. Thus, when I see a story about a problem with any drilling operation, I become very concerned. In this case, however, it appears to not be a problem with the rover itself.

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Air Force requests info for new engine

8:54 am

Corporate welfare: The Air Force on Thursday issued a request for information from industry for the replacement of the Russian-made engines used by ULA’s Atlas 5 rocket.

Companies are being asked to respond by Sept. 19 to 35 questions. Among them: “What solution would you recommend to replace the capability currently provided by the RD-180 engine?” Air Force officials have told Congress they only have a broad idea of how to replace the RD-180. Estimates of the investment in money and time necessary to field an American-built alternative vary widely. Congress, meanwhile, is preparing bills that would fund a full-scale engine development program starting next year; the White House is advocating a more deliberate approach that begins with an examination of applicable technologies.

In the request for information, the Air Force says it is open to a variety of options including an RD-180 facsimile, a new design, and alternative configurations featuring multiple engines, and even a brand new rocket. The Air Force is also trying to decide on the best acquisition approach. Options include a traditional acquisition or a shared investment as part of a public-private partnership. [emphasis mine]

The Atlas 5 is built by Lockheed Martin. This is really their problem, not the Air Force or ULA. In addition, the Air Force has other options, both from Boeing’s Delta rocket family as well as SpaceX’s Falcon 9 rocket. For the government to fund this new engine is nothing more than corporate welfare, at a time when the federal government is swimming in debt and is essentially bankrupt.

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Arianespace and ESA sign contract for three launches

9:53 am

Arianespace and the European Space Agency (ESA) signed a contract on Thursday for the Ariane 5 rocket to launch 12 more of Europe’s Galileo GPS satellites on three launches.

This contract is a perfect example of European pork. Europe’s Galileo system might provide competition to the U.S. GPS and Russian Glonass systems, but I am not sure what additional capabilities it provides that will convince GPS users to switch to it. Instead, building it provides European jobs, while using the Ariane 5 rocket to launch it gives that increasingly uncompetitive rocket some work to do. In fact, this situation really reminds me of the U.S. launch market in the 1990s, when Boeing and Lockheed Martin decided that, rather than compete with Russia and ESA for the launch market, they instead decided to rely entirely on U.S. government contracts, since those contracts didn’t really demand that they reduce their costs significantly to compete.

Europe now appears to be heading down that same road.

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NASA’s Space Launch System searches for a mission

9:26 am

Managers of NASA’s Space Launch System (SLS) are searching for a mission that they can propose and convince Congress to fund.

Any honest read of this article will conclude that this very expensive rocket system is an absurd waste of money. It has no mission now, and will never get one considering the cost. Instead, NASA will spend billions to fly two test flights, both unmanned, and then the money will run out.

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Sierra Nevada abandons its own hybrid engine for Dream Chaser

1:13 am

The competition heats up: Sierra Nevada has decided not to use its own hybrid engine on its Dream Chaser manned shuttle.

With the apparent decision by Virgin Galactic to also abandon this engine, it would appear that hybrid rocket technology is not yet ready for prime time, if ever.

Posted from Spokane, Washington, where Diane and I will be visiting my oldest friend Lloyd and his family for the rest of the week.

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