Tag: engineering

Saturn’s north pole hexagon jet stream

8:52 am

Saturn's north polar hexagon jet stream

Cool image time! The image on the right, reduced and cropped to show here, was taken by Cassini in January as it was preparing to head into its final 22 orbital dives between Saturn and its rings. The image shows the gas giant’s north polar, with all its magnificent features. As the press release notes, the north pole was in shadow for the first part of Cassini’s mission, and only in recent years has finally moved into sunlight so that the spaceship can see and image it.

Although the sunlight falling on the north pole of Saturn is enough to allow us to image and study the region, it does not provide much warmth. In addition to being low in the sky (just like summer at Earth’s poles), the sun is nearly ten times as distant from Saturn as from Earth. This results in the sunlight being only about 1 percent as intense as at our planet.

This view looks toward Saturn from about 31 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on Jan. 22, 2017 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 939 nanometers.

Be sure to look at the full image.

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NASA may have decided to fly humans on first SLS test flight

8:32 am

Doug Messier at Parabolic Arc has a story today suggesting that there are rumors at NASA that the agency has decided that it will put astronauts in Orion for SLS’s first test flight, now tentatively scheduled for sometime in 2019.

At he notes, this will only be the second time in history humans will have flown on a untested rocket, the first being the space shuttle, where they had no choice as the vehicle needed people to fly it.

NASA’s arguments in favor of this manned test flight will probably rest on noting how much of the rocket is based on previously flown equipment. For example, the upper stage for this flight will be a modified Delta upper stage, a well tested and frequently flown stage. The first stage will be made of side-mounted first stage solid rocket boosters that are essentially upgrades of the shuttle’s solid rocket boosters. And the first stage engines are actual shuttle engines salvaged from the shuttle’s themselves. In addition, NASA will note that Orion will have a launch abort system, though it appears that there will be no test of this system prior to the flight.

These arguments don’t carry much weight. The Delta upper stage will also be modified for this flight, and this will be that version’s first use. Similarly, the solid rocket boosters have been modified as well, and this will be their first flight. And as I noted, the Orion launch abort system will not have been tested in flight.

Finally, and most important, the goal of this test flight is to see if these different parts have been integrated together properly. As a unit, none of them has ever flown together. To put humans on such a flight is very foolish indeed.

Messier sums this up quite well:

The flight might come off just fine. But, I fear that NASA’s concern about keeping the program funded, and Donald Trump’s desire for some space spectacular to boost his re-election chances, could combine to produce something very unfortunate.

I pray that people in the Trump administration put a stop to this silliness, as soon as possible.

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The UAE plan to tow an iceberg from Antarctica for drinking water

3:14 pm

The United Arab Emirates (UAE) has a project to tow an iceberg more than 5,500 miles from Antarctica in order to provide that arid nation drinking water for about five years.

The National Advisor Bureau, headquartered in Masdar City, Abu-Dhabi, plans to source the massive blocks of ice from Heard Island, around 600 miles (1000 kilometres) off the coast of mainland Antarctica. It will then transport them around 5,500 miles (8,800 km) to Fujairah, one of the seven emirates which make up the UAE. One iceberg could provide enough for one million people over five years, according to the company.

And the scheme could begin as early as the start of 2018.

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SpaceX to launch Bulgarian satellite in June with used first stage

8:30 pm

Capitalism in space: SpaceX will fly its second used first stage in June when it launches a Bulgarian communications satellite.

In a statement, BulgariaSat said its BulgariaSat-1 spacecraft is scheduled to launch in mid-June on a Falcon 9 from Cape Canaveral, Florida. The first stage of that Falcon 9 will be the same one that launched 10 Iridium Next satellites from Vandenberg Air Force Base in California in January. Maxim Zayakov, chief executive of BulgariaSat, said the use of a reused first stage lowers the launch price and “makes it possible for smaller countries and companies to launch their own satellites.”

The company did not disclose the price it is paying for the launch, including what discount it is receiving for using a “flight-proven” first stage.

Previously SpaceX had said it would charge about $40 million for a launch using a previously flown first stage, so I would suspect the discount is somewhere around that.

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Bezos sells about $1 billion of his Amazon shares

8:39 am

Capitalism in space: This past week Amazon CEO Jeff Bezos raised about $1 billion in cash by selling 1 million shares of his stock in Amazon.

Amazon.com Inc. Chief Executive Officer Jeff Bezos sold about $1 billion in company stock as part of a planned divestiture, a month after the world’s third-richest man said he spends about that amount annually on his space exploration company Blue Origin LLC.

Bezos sold 1 million shares from Tuesday to Thursday ranging in price from about $935 to $950 per share, according to a regulatory filing on Thursday. He still owns 79.9 million shares, or about 17 percent of the company, down from 83 million shares at the end of 2015.

What this means for Blue Origin is that Bezos has very deep pockets, and will likely be able to finance the development of its very big New Glenn rocket without outside help. That the company will likely also win contracts along the way for the company’s BE-4 rocket engine will also not hurt Bezos’ financial position.

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India’s GSLV rocket successfully launches communications satellite

8:28 am

India’s successfully launched a communications satellite early today using its Mark II GSLV rocket.

Friday’s launch, designated GSLV F09, was the fifth flight of the Mark II GSLV which debuted in April 2010. This replaced the Mark I, which first flew in 2001 and made its final flight at the end of 2010, introducing an Indian-developed third stage engine instead of a Russian-built engine flown on the Mark I. With this new cryogenic propulsion system, the GSLV Mk.II is a fully indigenous vehicle.

The GSLV’s service has been marred by concerns over its reliability – to date only half of its flights have been successful – however last September’s launch of INSAT-3DR saw it achieve three consecutive successes for the first time.

This launch success significantly strengthens ISRO’s ability to sell its launch services worldwide. They now have three different rocket configurations, all entirely home built, and all with a string of launch successes.

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Curiosity’s last dune investigation

5:12 pm

As Curiosity moves closer to the very base of Mount Sharp, it is presently making its last investigation of the various types of dunes found at the foot of the mountain.

From early February to early April, the rover examined four sites near a linear dune for comparison with what it found in late 2015 and early 2016 during its investigation of crescent-shaped dunes. This two-phase campaign is the first close-up study of active dunes anywhere other than Earth.

Among the questions this Martian dune campaign is addressing is how winds shape dunes that are relatively close together, on the same side of the same mountain, into different patterns. Others include whether Martian winds sort grains of sand in ways that affect the distribution of mineral compositions, which would have implications for studies of Martian sandstones. “At these linear dunes, the wind regime is more complicated than at the crescent dunes we studied earlier,” said Mathieu Lapotre of Caltech, in Pasadena, California, who helped lead the Curiosity science team’s planning for the dune campaign. “There seems to be more contribution from the wind coming down the slope of the mountain here compared with the crescent dunes farther north.”

The article also included a vague update on the status of Curiosity’s drill, out of commission since its drill feed mechanism had problems moving the drill up and down back in the fall of 2016.

Engineers are assessing how the use of vibration to deliver samples may affect the drill feed mechanism, which is used to move the drill bit forward and backwards. In addition, high winds at the linear-dunes location were complicating the process of pouring sample material into the entry ports for the laboratory instruments.

“A balky brake appears to be affecting drill feed mechanism performance,” said Curiosity Deputy Project Manager Steven Lee, of NASA’s Jet Propulsion Laboratory, Pasadena, California. “In some cases, vibration has been observed to change feed effectiveness, so we’re proceeding cautiously until we better understand the behavior. In the meantime, the engineering team is developing several methods to improve feed reliability.”

What this release does not say is whether they are any closer to solving the problem, or whether the drill is essentially out of business for the reminder of Curiosity’s life. To me, the silence on this question is deafening, and strongly suggests that they have decided the drill cannot be used, for the foreseeable future.

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3D printing of bricks, using moondust

8:45 am

European engineers have managed to print bricks using simulated moondust and focused sunlight.

The resulting bricks have the equivalent strength of gypsum, and are set to undergo detailed mechanical testing. Some bricks show some warping at the edges, Advenit adds, because their edges cool faster than the centre: “We’re looking how to manage this effect, perhaps by occasionally accelerating the printing speed so that less heat accumulates within the brick. But for now this project is a proof of concept, showing that such a lunar construction method is indeed feasible.”

The video at the link is very unconvincing. While it shows film of the printing process, it does not show film of anyone holding or manipulating the finished bricks. Instead, it shows one or two photos of finished bricks, all of which give the impression that these bricks crumble easily at the edges, I suspect that the bricks are simply too fragile for practical use.

So, is this a proof of concept? Maybe. They have at least shown that 3D printing using materials on the Moon might work.

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Cassini science team releases movie of images from first ring dive

5:25 pm

The Cassini science team has released a movie compiled from images taken during the spacecraft’s first dive between Saturn and its rings.

I have embedded the movie below the fold. It cuts off before the spacecraft’s closest approach because they took a very conservative approach to this fly-by, turning the vehicle so that its antenna dish protected it. This prevented the taking of the best images. The second dive, that occurred yesterday, will have better images.
» Read more

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Maiden flight of China’s new 158-seat C919 passenger jet

4:16 pm

China’s answer to Boeing and Airbus’s domination of the aviation business, a 158-seat passenger jet dubbed C919, is due to make its maiden flight later this week.

According to Xinhua, the first flight of the C919, assembled by state-owned Commercial Aircraft Corporation of China (Comac), will be conducted at the Shanghai International Airport on Friday, but could be delayed if weather conditions are not suitable. The timing for the first flight was set after the passenger jet passed a thorough assessment in April.

A successful maiden flight, followed by a series of safety certification processes, could open a floodgate for new orders for the single-aisle passenger jet, likely to generate 1 trillion yuan (HK$1.13 trillion) in business for Comac, according to Galaxy Securities. The C919 has received 570 orders and commitments from 23 customers, mainly Chinese state-owned carriers and leasing companies.

The plane is three years behind schedule. And while much of it is Chinese-made, a considerable percentage of major parts are produced by U.S. and European manufacturers.

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The soft avalanches of Mars

9:23 am

Krupac Crater gullies

Cool image time! The image on the right, reduced in resolution to show here, shows the gullies flowing down Krupac Crater on Mars. Be sure to check out the original, released today by the Mars Reconnaissance Orbiter science team, since they have enhanced the colors to bring out the sandy flows, noting as well that while most of these gullies are found in higher latitudes, this crater at 7.8 latitude has them as well.

Although large gullies (ravines) are concentrated at higher latitudes, there are gullies on steep slopes in equatorial regions. An enhanced-color closeup shows part of the rim and inner slope of Krupac Crater located just 7.8 degrees south of the equator.

The colors of the gully deposits match the colors of the eroded source materials. Krupac is a relatively young impact crater, but exposes ancient bedrock. Krupac Crater also hosts some of the most impressive recurring slope lineae (RSL) on equatorial Mars outside of Valles Marineris.

Below I have cropped out a small section showing, at full resolution, the termination point of one of these flows, indicating where this section is on the larger image to the right. This avalanche is clearly not liquid, though it has a very sandy and soft nature, suggesting — as some scientists have theorized — that liquid from below the surface might have played a part in its flow.

It is important in looking at these images to repeatedly remind yourself that the gravity here is about one third that of Earth, and thus the angle of repose will be different, and that avalanches will behave very differently in this environment. Moreover, Mars’s far colder climate will also effect things. The avalanche we are looking at could not happen in this way on Earth.

close-up of flow

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NASA looks to private companies for lunar missions

8:53 am

Capitalism in space: NASA has issued a request for information on possible private commercial missions capable of carrying NASA payloads to the Moon.

From the announcement:

NASA has identified a variety of exploration, science, and technology demonstration objectives that could be addressed by sending instruments, experiments, or other payloads to the lunar surface. To address these objectives as cost-effectively as possible, NASA may procure payloads and related commercial payload delivery services to the Moon

In other words, NASA has money to spend on lunar science missions, and rather than plan those missions itself, as it has done since the 1960s, it is now offering to buy and launch proposals from private companies.

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Iran announces launch plans for 2018

8:46 am

Iran’s Aerospace Research Instititue (ARI) has announced that it plans to launch its Nahid-2 communications satellite in 2018.

Interestingly, Iran’s first Nahid communications satellite, Nahid-1, has missed its announced March 2017 launch date. Worse, that satellite had been first scheduled for launch in 2012. Similarly, a remote sensing satellite that was supposed to have been launched in the early part of this year, Dousti, has also been delayed.

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ISRO requests Indian proposals for Venus probe

8:39 am

India’s space agency ISRO has issued a request for proposals from Indian scientists for the scientific instruments to be installed on a future probe to Venus.

The announcement included the following information about the proposed Venus orbiter itself:

The payload capability of the proposed satellite is likely to be 175 kg with 500W of power. However these values are to be tuned based on the final configuration. The proposed orbit is expected to be around 500 x 60,000 km around Venus. This orbit is likely to be reduced gradually, over several months to a lower apoapsis.

All told it appears that India is moving forward with this project, and probably intends to build it much like they build Mangalyaan, their successful Mars orbiter, quickly, efficiently, and for relatively low cost.

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Company that analyzes satellite data raises $50 million

8:30 am

Capitalism in space: Orbital Insight, a company that uses computers to analyze satellite imagery of the Earth, has raised $50 million in new investment capital.

The fresh capital will be used to expand its partnerships, increase its analytics products, and build bigger international sales operations in Europe and Asia, Orbital said. The Mountain View, California-based company founded by former NASA scientist and Google engineer James Crawford also will step up recruiting in engineering, data science and design.

Falling satellite launch costs are helping make geospatial imagery a bigger and better source for economists and investors tracking everything from China’s manufacturing to the number of cars parked outside Wal-Mart stores. Venture capital investment in space companies jumped to a record nearly $1.4 billion last year, bringing the total since 2000 to $13.3 billion, Goldman Sachs Group Inc. said in a report last month. [emphasis mine]

Nor are the lower launch costs hurting the launch industry. Instead, the industry is booming, as it now has a lot more customers available to buy their launch services.

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North Korean missile destroyed because it was heading to Russia?

9:53 am

A new report today suggests that the North Koreans purposely destroyed their ballistic missile on Saturday because their tracking indicated it would land in Russia.

According to South Korea’s SE Daily, the ballistic missile would have struck ‘a harbour point or a Russian territory’ if it had not failed. ‘It is for this reason that North Korea intentionally destroyed the missile,’ the website reportedly said. A source is quoted as saying the launch target was ‘different from the previous direction’ and that ‘in the past, we fired 89-90 degrees to the east, and the projectile fell off the East Sea. But the angle of this shot was 49 degrees.’

So far the theories surrounding this missile test include an unintended explosion, a planned explosion, an aborted explosion, and even sabotage. All this suggests to me that the real issue here is that we really don’t have good intelligence behind North Korea’s actions.

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Cassini finds gap in Saturn’s rings surprisingly empty

6:50 pm

The uncertainty of science: The data from Cassini’s first dive through the gap between Saturn and its innermost ring suggests that the space there has much less material than predicted.

Cassini’s Radio and Plasma Wave Science (RPWS) instrument was one of two science instruments with sensors that poke out from the protective shield of the antenna (the other being Cassini’s magnetometer). RPWS detected the hits of hundreds of ring particles per second when it crossed the ring plane just outside of Saturn’s main rings, but only detected a few pings on April 26. When RPWS data are converted to an audio format, dust particles hitting the instrument’s antennas sound like pops and cracks, covering up the usual whistles and squeaks of waves in the charged particle environment that the instrument is designed to detect. The RPWS team expected to hear a lot of pops and cracks on crossing the ring plane inside the gap, but instead, the whistles and squeaks came through surprisingly clearly on April 26.

“It was a bit disorienting — we weren’t hearing what we expected to hear,” said William Kurth, RPWS team lead at the University of Iowa, Iowa City. “I’ve listened to our data from the first dive several times and I can probably count on my hands the number of dust particle impacts I hear.” The team’s analysis suggests Cassini only encountered a few particles as it crossed the gap — none larger than those in smoke (about 1 micron across).

The second dive through the rings will occur tomorrow, with data sent down the next day. Because the gap is emptier than expected, they will not have to protect the spacecraft so thoroughly, and will thus have more instruments gathering data during the fly through.

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Elton John – Rocket Man

6:01 pm

An evening pause: Hat tip Sayomara. This pause is slightly different, and is really two-for-one. The background music is Elton John’s “Rocket Man,” but the visuals are of SpaceX’s future spaceport site at Boca Chica beach near Brownsville, Texas. Apparently someone used a drone to fly over the site and videotaped it. As Sayomara noted, this “shows how far away this site is from being usable.”

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North Korean missile explosion part of planned test

12:27 pm

South Korean government officials said today that they do not believe the most recent North Korean missile test, which exploded shortly after launch, was a failure.

“We don’t believe the mid-air explosion was an accident,” cable news channel YTN quoted a government official as saying. “It’s believed the explosion was a test to develop a nuclear weapon different from existing ones.”

The nuclear-armed isolated country fired a ballistic missile on Saturday morning from near Pukchang in Pyeongannam-do (South Pyeongan Province). The missile climbed to 71 kilometers before exploding within North Korean territory, according to the South Korean and U.S. defense ministries. The explosion happened two or three minutes after blast-off.

Military experts say mid- or long-range missiles normally stabilize at 20 or 30 kilometers above ground. In the latest test, the missile climbed to three times the so-called “stabilizing height, which means the chances that any internal mechanical failure caused the explosion were “very low,” according to experts.

The officials also added that they think this test flight is preparation for a future nuclear bomb test that would take place above ground.

Update: This detailed essay takes a look at North Korea’s military capabilities for attacking its neighbors by short and long range artillery and missiles.

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SpaceX successfully launches first surveillance satellite

8:41 am

Capitalism in space: SpaceX this morning successfully launched its first National Reconnaissance Office (NRO) surveillance satellite.

They also successfully landed the first stage at the cape. Video below the fold. These first stage landings are becoming entirely routine, which in the long run will probably be their biggest single achievement. Expect this stage to fly again.

Last night John Bachelor emailed me a link to a podcast I did with him from April 2011, six years ago. He has reposted it, entitling it “SpaceX underbids Big Space & the beginning of commercial space supremacy.” During that appearance I noted the signing of SpaceX’s first contract with NRO. That contract led to today’s launch.

About the same time I posted a story describing NASA’s first small development contracts for commercial manned capsules, awarded to Blue Origin, Sierra Nevada, SpaceX and Boeing. In that post, I predicted the following about this commercial effort:

I bet they all get their rockets/capsules launched and in operation, supplying cargos and crews to low Earth orbit, before NASA even test fires its heavy-lift rocket [SLS].

Looks like that’s a prediction that will turn out true.
» Read more

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North Korea ballistic missile test ends in failure

2:53 pm

North Korea on Saturday local time once again attempted and failed to launch a ballistic missile.

Some details here. The missile flew 25 miles, and was a short range missile.

While previously I attributed the consistent failures of every single North Korean missile test to the inherent incompetence of that society’s totalitarian regime, I am now beginning to wonder if espionage from either the U.S. or China might be a contributing factor. It seems unlikely, and the simplest explanation remains engineering failures with North Korea’s aerospace industry. Yet…

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Trump administration eases technology restrictions to Saudi Arabia

8:22 am

The Trump has eased satellite technology restrictions that had been placed on Saudi Arabia and the member states of the Gulf Cooperation Council (GCC).

It is believed that the Washington, DC, discussions between the U.S. and the Saudis saw agreements on U.S. support for the Saudi-led coalition in Yemen and also on common approaches towards containing Iran. Of particular significance, however, is the agreement by the U.S. to lift export restrictions on strategic technologies such as unmanned aerial vehicles and reconnaissance satellites to Saudi Arabia, and potentially to other GCC countries.

It is believed that Saudi Arabia is in the market for two to eight high-resolution reconnaissance satellites over the coming years, and it is known that French companies Airbus Defence and Space and Thales Alenia Space have partnered together to offer electro-optical reconnaissance satellites similar to the Falcon Eye satellites being built for the United Arab Emirates.

This change will also benefit U.S. satellite makers, giving them a better chance at winning Saudi contracts. At the same time, it makes available to these Middle East Islamic nations some high level technology that could be used against us.

Update: While his administration has quietly widened cooperation with Saudi Arabia, President Trump is publicly complaining that the Arab country takes advantage of the U.S.

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NASA officially delays SLS first flight to 2019

12:40 pm

Government in action! Despite spending almost $19 billion and more than thirteen years of development, NASA today admitted that it will have to delay the first test flight of the SLS rocket from late 2018 to sometime in 2019.

“We agree with the GAO that maintaining a November 2018 launch readiness date is not in the best interest of the program, and we are in the process of establishing a new target in 2019,” wrote William Gerstenmaier, chief of NASA’s human spaceflight program. “Caution should be used in referencing the report on the specific technical issues, but the overall conclusions are valid.”

Anyone who is a regular reader of Behind the Black will not be surprised by this. Beginning as far back as March 2015 I began noting the various issues that made a 2018 launch unlikely. All that has happened here is that NASA has gone public with what has been obvious within the agency now for two years.

The competition between the big government SLS/Orion program and private commercial space is downright embarrassing to the government. While SLS continues to be delayed, even after more than a decade of work and billions of wasted dollars, SpaceX is gearing up for the first flight of Falcon Heavy this year. And they will be doing it despite the fact that Congress took money from the commercial private space effort, delaying its progress, in order to throw more money at SLS/Orion.

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Hibernation research for long space flights

12:19 pm

Scientists are doing new research at using some form of hibernation for humans traveling on interplanetary missions lasting months or years.

Bradford’s engineering and medical team used the first of those NIAC grants, issued in 2013, to design a compact zero-gravity, rigid-structure habitat based on the International Space Station crew module designs. The habitat featured closed-loop oxygen and water production systems, direct access to the Mars ascent and descent vehicles, and support for a crew of six, all of whom would be kept in torpor for the entire six- to nine-month Mars journey.

The proposed medical treatment relies on using techniques similar to the ones surgeons perfected to induce hypothermia. For example, cooling nitrogen gas could be fed to astronauts via nasal cannula, lowering brain and body temperatures to between 89 and 96 degrees—close enough to normal to maintain torpor without overcooling the heart or increasing the risk of other complications. Cooling tends to decrease the body’s ability to clot, Tisherman says. He has also noted that patients who are cooled to mild levels of hypothermia—93 degrees—for 48 hours or more have more infections than uncooled people.

As is usual in these modern fascist times, bureaucracy and the fear of radical protesters are preventing this research from moving forward. NASA is forbidden to fund any research that uses live animal subjects, such as pigs, even though they are ideal subjects and, as noted in the article, “The number of pigs involved in this kind of study wouldn’t amount to one’s week’s breakfast for the average American.” Private funds have also not raised because no one wants to deal with the public relations nightmare of PETA protests.

The article is long and detailed, and gives an excellent overview of the state of the field as well as the research questions it faces. Above all, it does indicate that the idea of using hibernation in space, born in science fiction, is not so much of a fantasy after all.

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