Tag: spaceflight

Scientists demonstrate first space navigation on ISS using pulsars

10:12 am

The stars are ours! Scientists using an x-ray telescope installed on ISS have demonstrated it is possible to pinpoint the location of a spaceship and thus navigate through space using pulsars.

In the SEXTANT demonstration that occurred over the Veteran’s Day holiday in 2017, the SEXTANT team selected four millisecond pulsar targets — J0218+4232, B1821-24, J0030+0451, and J0437-4715 — and directed NICER to orient itself so it could detect X-rays within their sweeping beams of light. The millisecond pulsars used by SEXTANT are so stable that their pulse arrival times can be predicted to accuracies of microseconds for years into the future.

During the two-day experiment, the payload generated 78 measurements to get timing data, which the SEXTANT experiment fed into its specially developed onboard algorithms to autonomously stitch together a navigational solution that revealed the location of NICER in its orbit around Earth as a space station payload. The team compared that solution against location data gathered by NICER’s onboard GPS receiver. “For the onboard measurements to be meaningful, we needed to develop a model that predicted the arrival times using ground-based observations provided by our collaborators at radio telescopes around the world,” said Paul Ray, a SEXTANT co-investigator with the U. S. Naval Research Laboratory. “The difference between the measurement and the model prediction is what gives us our navigation information.”

The goal was to demonstrate that the system could locate NICER within a 10-mile radius as the space station sped around Earth at slightly more than 17,500 mph. Within eight hours of starting the experiment on November 9, the system converged on a location within the targeted range of 10 miles and remained well below that threshold for the rest of the experiment, Mitchell said. In fact, “a good portion” of the data showed positions that were accurate to within three miles. “This was much faster than the two weeks we allotted for the experiment,” said SEXTANT System Architect Luke Winternitz, who works at Goddard. “We had indications that our system would work, but the weekend experiment finally demonstrated the system’s ability to work autonomously.”

I think everyone who is interested in interstellar space travel has assumed since the discovery of the first pulsars that they would end up serving as the future north star for interstellar travelers. This experiment shows us how it will be done.

Well read science fiction fans should recognized the literary reference in the tagline.

3 comments

A spectacular collapse feature at Arsia Mons

3:55 pm

Collapse at Arsia Mons

Cool image time! This post could be called an update to my January 8th post, Exploring Arsia Mons. In that post I had compiled together the ten images of Arsia Mons, the southernmost volcano in the line of three giant volcanoes on Mars, that JPL had highlighted over several weeks in early January.

Today, I decided to do some of my own exploration of some of the many images taken of Arsia Mons by all of the Martian orbiters. My goal had been to explore the volcano’s western slopes (an area that had not been featured in the JPL releases) because that is the area where research has found evidence of past glacial activity as well as seasonal water clouds. I haven’t finished that survey, but in the process I came across a spectacular image of a collapse that had been visible in image nine of the January 8th post, but did not stand out there because of the lighting. The image on the right is that better image, cropped to focus in on the collapse itself.

The material at the base of the wall resembles piled up mud, which suggests this collapse is a Martian version of a mud slide. If so, it also suggests the presence of liquid. At the same time, the muddy look might not be from liquid but because of the lighter Martian gravity causing avalanches to be appear different there. The light gravity means material is not as dense, so when it collapses it might break apart more easily into a sandy type flow.

I am only an amateur geologist, so my theories here should not be taken very seriously. Nonetheless, I am sure there are planetary geologists who have looked at this closely because of the information about Martian geology that they can glean from it. I’d be curious to hear their thoughts.

Meanwhile, my exploration of the western slopes of Arsia Mons will continue. In Pioneer the science fiction book I wrote in the early 1980s (now available), I placed my Martian colony in Mangala Valles, a meandering canyon to the west of Olympus Mons that feeds out from the higher southern regions into the lower northern flat plains where even then some scientists thought an ocean might have once existed. My thinking then was that this might be a good location to find underground water. It now appears, with our greater knowledge, that the slopes of the volcanoes themselves might be more promising, and I am curious to find the most likely places in this region where a future colony might end up.

2 comments

Is the Google Lunar X-Prize dead?

8:56 am

Doug Messier today has written a sad summary of the status of the Google Lunar X-Prize, and it does appear that no one is going to meet the March 31, 2018 deadline.

The news yesterday that Team Indus failed to raise the cash to pay for its rocket launch appears to have killed both it and the Japanese competitor. Lack of funds also appear to have stopped the Israeli team. Meanwhile, delays in getting the rockets operational for Moon Express and Synergy Moon leave both stranded on the ground.

3 comments

Falcon Heavy prepped for static fire test

10:29 am

Capitalism in space: SpaceX has raised its first Falcon Heavy rocket onto the launchpad in preparation for the static fire test required before the rocket can do its first launch.

SpaceX’s first Falcon Heavy rocket has been raised vertical at pad 39A for the second time in advance of a planned hold-down test-firing of its main engines tomorrow during a window that extends from 1-7 pm EST (1800-0000 GMT). Kennedy Space Center employees were told to expect an estimated 15-second firing.

7 comments

ULA settles lawsuit that said it defrauded government of $90 million

9:11 am

ULA has settled a lawsuit with a whistleblower who claimed the company had defrauded the federal government of at least $90 million by overbilling employee work hours.

Unlike the commercial marketplace where prices of goods and services are determined by market forces including competition, sellers in the aerospace industry face little or no competition and contract pricing is based largely on a contractor’s estimated costs, the lawsuit says.

ULA charged the government tens of millions of dollars for work that was never performed and inflated the estimated labor hours including the time required to buy parts and materials from vendors, the lawsuit says.

ULA retaliated against Scott [the whistleblower] by forcing him out of the company after he revealed the alleged illegal activities. ULA officials placed a camera above his desk, monitored and questioned his cell phone and computer use, and suggested he violated the law or engaged in improper bidding practices himself, the lawsuit says.

ULA used a system called the Keith Crohn model that creates a grid using the cost of equipment to reach an employee cost. A labor value was placed on the grid for every item ordered through the company’s purchasing department. For example, any item that cost between $1 and $1,000 would be assigned a labor value of 8 hours. It didn’t matter what part it was, the lawsuit said. The U.S. bans arbitrary cost estimates when actual data is available that establishes the cost.

The first paragraph of the quote above actually describes the bad deal that the Air Force made with ULA back in the early 2000s, giving the company a monopoly on launches while subsidizing it to the tune of $1 billion per year. That deal is now dead, and ULA is instead forced to compete with SpaceX (and soon others I hope) for launch contracts. Not surprisingly, their prices have dropped considerably.

One comment

Arianespace aims for 14 launches in 2018

9:01 am

The competition heats up: Arianespace officials told reporters today that it plans to complete 14 launches in 2018, which would be a record for the company.

For 2018, the company is targeting seven launches of the Ariane 5 model, four launches for the Soyuz model and three launches of the Vega satellite launcher.

Isn’t competition wonderful? SpaceX forces everyone to lower their launch prices, and instead of going out of business, which the old rocket companies were saying would happen for decades should they be forced to drop prices, everyone gets more customers, more business, and more profits. I am shocked, shocked!

Whether Arianespace can maintain this growth however is another story. As newer rocket companies, such as Blue Origin, come on line with even lower costs, I am not sure their more expensive rockets will survive.

One comment

An update on Zuma status

8:54 am

Link here. The article provides a nice summary of all the reports on the SpaceX launch and its mysterious top secret payload Zuma, including outlining the various failure possibilities. The one scenario they do not mention, however, is that the failure story itself is entirely bogus, a misinformation campaign by the unknown government agency that launched it.

I have no idea what happened, though it still appears to me most likely that SpaceX’s rocket performed as contracted.

12 comments

SpaceX military payload might have been lost

3:42 pm

Anonymous sources are suggesting that the top secret government payload that SpaceX successfully placed in orbit two days ago might have been lost.

Very little is presently known. Statements from SpaceX suggest that its Falcon 9 rocket worked perfectly, which would suggest the problems occurred after second stage separation. However, one source seems to suggest otherwise.

Until I get more information, I am therefore still counting this launch as a success for SpaceX.

13 comments

Exploring Arsia Mons

2:01 pm

Master index

In November over a period of two weeks the Mars Odyssey team posted ten images of Pavonis Mons, the smallest of the aligned three giant volcanoes just to the east of Olympus Mons, the largest known volcano in the solar system. I then made all of those images available in a single link, with some analysis.

They have now done the same thing for the southernmost (and possibly the most interesting) of those three aligned volcanoes, Arsia Mons. From the first image below:

Arsia Mons is the southernmost of the Tharsis volcanoes. It is 270 miles (450km) in diameter, almost 12 miles (20km) high, and the summit caldera is 72 miles (120km) wide. For comparison, the largest volcano on Earth is Mauna Loa. From its base on the sea floor, Mauna Loa measures only 6.3 miles high and 75 miles in diameter. A large volcanic crater known as a caldera is located at the summit of all of the Tharsis volcanoes. These calderas are produced by massive volcanic explosions and collapse. The Arsia Mons summit caldera is larger than many volcanoes on Earth.

In other words, you could fit almost all of Mauna Loa entirely within the caldera of Arsia Mons.

The image on the right above is the master index, annotated by me to show the area covered by each image. The images can accessed individually below.
» Read more

Leave a comment

R.I.P. John Young 1930-2018

8:33 pm

John Young, the ninth man to walk on the Moon and the only man to fly a Gemini capsule, an Apollo capsule, and the space shuttle, passed away yesterday at the age of 87.

Young was the only spaceman to span NASA’s Gemini, Apollo and shuttle programs, and became the first person to rocket away from Earth six times. Counting his takeoff from the moon in 1972 as commander of Apollo 16, his blastoff tally stood at seven, for decades a world record.

He flew twice during the two-man Gemini missions of the mid-1960s, twice to the moon during NASA’s Apollo program, and twice more aboard the new space shuttle Columbia in the early 1980s.

His NASA career lasted 42 years, longer than any other astronaut’s, and he was revered among his peers for his dogged dedication to keeping crews safe — and his outspokenness in challenging the space agency’s status quo.

Young captained the first shuttle Gemini flight and the first space shuttle flight, and also flew twice to the Moon, landing once.

God speed.

4 comments

Atlas 5 man-rated upgrades approved by NASA for Starliner launches

11:17 pm

Capitalism in space: ULA announced this week that its Atlas 5 rocket has passed a NASA review that now approves the design changes necessary to allow that rocket to launch Boeing’s Starliner manned capsule.

“Design Certification Review is a significant milestone that completes the design phase of the program, paving the way to operations,” said Barb Egan, ULA Commercial Crew program manager. “Hardware and software final qualification tests are underway, as well as a major integrated test series, including structural loads. Future tests will involve launch vehicle hardware, such as jettison tests, acoustic tests, and, finally, a pad abort test in White Sands, New Mexico.”

Launch vehicle production is currently on track for an uncrewed August 2018 Orbital Flight Test (OFT).

The schedule to make that August flight happen still remains tight, but this approval brings it one step closer.

6 comments

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.

10 comments

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.

2 comments

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.

One comment

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.

Leave a comment

The state of the worldwide rocket industry at the start of 2018

8:00 am

In January 2017 I posted a graph that showed the total successful rocket launches, by company and nation, from the years 1998 through 2016. That graph allowed me to note some interesting trends, of which the following were the three most significant:

First, 2016 was the worst year for the Russian rocket industry in decades. In fact, their launch total of only 18 might be the fewest Russian launches in a year since the beginnings of the space race.

Second, China has been aggressively ramping up its launch rate, and in 2016 moved clearly into the top tier of space-faring nations. Their prediction that they are aiming for 30 launches in 2017 is further evidence that this effort is not a temporary thing.

Third, the United States is clearly transitioning away from a government owned and operated rocket industry to one owned and operated by the private sector. Since the retirement of the space shuttle, the federal government has not launched a single rocket that it designed, built, and owns. Instead, every payload put in space by the U.S. has been put there by a private sector rocket.

Below the fold is a new graph. It now includes 2017, but also goes back to 1980, which I think makes a good starting point for the true beginning of the modern the rocket industry. In December 1979 Arianespace successfully completed the first launch of Ariane 1, beginning its effort to build a commercial rocket that would capture market share in the communication satellite industry. In 1980 India launched its first rocket. And in 1981 the space shuttle began flying.
» Read more

27 comments

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.

16 comments

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.

Leave a comment

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.

14 comments
1 … 308 309 310 311 312 … 490