Tag: engineering

First results from Cassini’s dives between Saturn and its rings

11:35 am

The first results from Cassini’s weekly dives between Saturn and its innermost rings have now been released.

The big surprise so far is the lack of a tilt to Saturn’s magnetic field.

Based on data collected by Cassini’s magnetometer instrument, Saturn’s magnetic field appears to be surprisingly well-aligned with the planet’s rotation axis. The tilt is much smaller than 0.06 degrees — which is the lower limit the spacecraft’s magnetometer data placed on the value prior to the start of the Grand Finale.

This observation is at odds with scientists’ theoretical understanding of how magnetic fields are generated. Planetary magnetic fields are understood to require some degree of tilt to sustain currents flowing through the liquid metal deep inside the planets (in Saturn’s case, thought to be liquid metallic hydrogen). With no tilt, the currents would eventually subside and the field would disappear.

Any tilt to the magnetic field would make the daily wobble of the planet’s deep interior observable, thus revealing the true length of Saturn’s day, which has so far proven elusive.

They also have gotten lots of much better images of the planet’s cloud tops.

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NASA and Lockheed Martin to build simulated interplanetary spaceship, on the ground

9:53 am

Yawn. NASA and Lockheed Martin have partnered to re-purpose a leftover shuttle cargo module into a ground-based simulated interplanetary spaceship.

Lockheed Martin announced it will refurbish the Donatello multi-purpose logistics module (MLPM), transforming from it from its original, unrealized role as a supply conveyor for the International Space Station to a test and training model of a living area for astronauts working beyond Earth orbit. The work is being done under a public-private partnership between the aerospace corporation and NASA. “We are excited to work with NASA to repurpose a historic piece of flight hardware,” said Bill Pratt, Lockheed Martin’s program manager for the deep space habitat contract, in a statement.

…Over an 18-month period, Lockheed Martin will build upon its deep space habitat concept it developed during the first phase of NASA’s Next Space Technologies for Exploration Partnerships, or NextSTEP, program by using virtual and augmented reality prototyping in an effort to reduce costs and schedule, as well as identify and address issues while early in the design process. The results, to be shared with the space agency, will help to further understanding of the systems, standards and interfaces needed to make living in deep space possible.

This is nice, but it is essentially make-work for Lockheed Martin and a waste of money. At this stage of our engineering knowledge, we need to fly our interplanetary spaceship prototypes. Building them on the ground can only provide a limited amount of new knowledge, much of which has already been learned from numerous very similar past ground-based experiments.

For example, why isn’t NASA and Lockheed Martin also partnering with SpaceX, contracting to fly Donatello on the Falcon Heavy? That makes a lot more sense, and would not cost a lot of additional money. In fact, it might be quite cheap, since SpaceX needs customers willing to gamble on its new heavy-lift rocket.

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Schedule for commercial manned flights solidifies

5:54 pm

Capitlism in space: It appears that the schedule for the first unmanned and manned test flights of the commercial capsules being built by SpaceX and Boeing is getting more certain.

The latest SpaceX schedule calls for an uncrewed test flight in February 2018, followed by a crewed test flight in June 2018. Boeing’s schedule anticipates an uncrewed test flight in June 2018 and a crewed test flight in August 2018.

While this sounds encouraging, the story contradicts a Boeing report last week that suggested their first manned flight would be delayed into the fourth quarter of 2018. Both stories however pin the first unmanned demo flight for June 2018, which now seems to be a firm date.

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Opportunity enters Perseverance Valley

10:06 am

Opportunity in Perseverance Valley

Just prior to the drop in communications this week because of the Sun’s position between the Earth and Mars, Opportunity was ordered down into Perseverance Valley, where it will sit until the return of full communications.

Opportunity entered Perseverance Valley on the west rim of Endeavour crater. The rover is positioned within the valley where she will spend the solar conjunction period.

Solar conjunction is when the Sun comes between Earth and Mars, which occurs about once every 26 months. During this time, there will be diminished communications to Opportunity. More on solar conjunction here: https://mars.jpl.nasa.gov/allaboutmars/nightsky/solar-conjunction/

Two weeks of commanding have been uploaded to the rover to keep her active during solar conjunction with short communications with the Mars orbiters during the period.

The image on the right, reduced to show here, was taken by the rover’s navigation camera looking back uphill at the crater’s crest and the rover’s tracks in the valley. For the scientists the tracks are important because they reveal what the surface of the valley is like, which will help them determine whether it was formed from flowing water, flowing ice, or wind.

Even more significant, this initial drive into the valley means the science team has decided that either the wheel issues in June were not serious enough to prevent them from making this downhill trip, or the science is important enough that they are willing to risk the rover to get that science.

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Growing cucumbers in space

9:48 am

New research growing cucumbers on ISS has found that the roots of these plants grew in the direction of water in weightlessness.

Plant roots grow to find water, according to a process known as hydrotropism. Roots are also influenced by gravity and tend to grow downwards, called gravitropism. To find out whether gravity or water had the greater influence on root growth, investigators grew cucumber plants in the microgravity environment on board the International Space Station. In their experiments, water (or hydrotropism) had more influence in controlling root growth.

“We will be able to utilize roots’ ability to sense moisture gradients for controlling root growth orientation and efficiently growing plants in future space farms,” said Dr. Hideyuki Takahashi, senior author of the New Phytologist study.

You can read the full science paper here.

This might sound obvious, but it isn’t. Past plant growth experiments on Mir and ISS had tended to show that plant roots did not know where to grow in weightlessness, suggesting that they needed gravity to guide the roots to water. Because of this, later experiments in space provided the roots complicated engineering to guide the roots to the water.

This experiment shows that maybe that complex engineering is not necessary, or at least could be simplified a bit. At a minimum it is crucial information engineers will need to design any future gardens for interplanetary spaceships with long term weightlessness.

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ISRO’s 104 satellite launched earned India about $7 million

9:23 am

Capitalism in space: India’s space agency ISRO on Wednesday revealed to that country’s parliament that its record-setting 104 satellite launch on June 23 earned about $7 million.

On June 23 this year, PSLV-C38 had launched 712-kg Cartosat-2 satellite along with 30 co-passenger satellites. Of the 30 nano satellites, while one belonged to Noorul Islam University from Tamil Nadu, the rest 29 were from 14 foreign countries. On Wednesday, the government informed the Lok Sabha that the launch of 29 foreign satellites helped Antrix Corporation Ltd (ACL), the commercial and marketing arm of Isro, earn Rs 45 crore (6.1 million euros).

Before the June 23 multiple launch, Isro made the world record when its PSLV C37 launched 104 satellites in one go on February 15 this year. However, the space agency did not reveal how much it earned from that record-breaking launch. Out of the 104 satellites, 96 were from the US, three from India and one each from Israel, Kazakhstan, the Netherlands, Switzerland and the UAE.

From an American perspective it is encouraging that U.S. companies dominated the satellite count. From India’s perspective, the profits here are only going to encourage that nation to push for more rockets and cheaper costs.

The one problem I see with this is that it is the government that is obtaining the profits, not private Indian citizens or companies. Such an arrangement will not be good for India in the long run, as it encourages the government to use its coercive power to squelch private competitors.

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NASA and Boeing to replace damaged antenna on NASA satellite

8:49 pm

Due to an accident during satellite launch preparations, NASA and Boeing are planning to replace a damaged antenna on NASA’s TDRS-M satellite, used by NASA mainly for communications between the ground and ISS.

The update at the link however says nothing whether the satellite will still launch on August 3, as presently scheduled. Nor have they released any information about the accident itself.

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Opportunity takes panorama at top of Perseverance Valley

3:38 pm

On top of Perseverance Valley

During Opportunity’s two week pause in its travels in June as engineers tried to diagnose a problem with its left-front wheel, it took a wide panorama of the surrounding terrain, including the top of Perseverance Valley, released today.

The full panorama, shown above in reduced resolution, is a bit confusing. The head of Perseverance Valley to the northeast is on the right. The view straight ahead looks west, away from the crater. The hill and raising terrain on the left is the crater rim to the south of Perseverance Valley. The panorama is not a complete 360 degree view, as it does not include a direct view to the east and into Endeavour Crater itself.

Be sure and click on the link and look at the full image. The top of the valley is really interesting to view. Was it formed by wind or water or water ice? They hope to find out.

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Hubble shoots movie of Phobos

10:34 am

Phobos over Mars

Cool image time! By taking a quick series of thirteen images, the Hubble Space Telescope was able to shoot a short movie of the rotation of Phobos above the surface of Mars. The gif animation on the right is the smaller of the two animations released today. Be sure and view the full resolution version.

What is even cooler is that movie was apparently unplanned. From the link:

Over the course of 22 minutes, Hubble took 13 separate exposures, allowing astronomers to create a time-lapse video showing the diminutive moon’s orbital path. The Hubble observations were intended to photograph Mars, and the moon’s cameo appearance was a bonus.

In terms of science this movie has a somewhat limited value. In terms of space engineering it is triumph, and once again illustrates the unprecedented value of having an optical telescope in space. Woe to us all when Hubble finally dies, as we have no plans to replace it.

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News from SpaceX

10:18 pm

Capitalism in space: At the annual convention of the National Space Society, Elon Musk revealed some significant new details about his company’s future engineering and launch plans.

The first two stories are related, as it had been powered landings that SpaceX hoped to use for its Red Dragon Mars landings. Dropping powered landings, at this time, means that the first Dragon mission to Mars will likely not happen in 2020. While Musk outlined a number of good engineering reasons for this decision, to me this quote from the first article was significant:

SpaceX planned to transition from splashdowns, which is how the current cargo version of the Dragon returns to Earth, to “propulsive” landings at a pad at some point after the vehicle’s introduction. Certification issues, he said, for propulsive landings led him to cancel those plans. “It would have taken a tremendous amount of effort to qualify that for safety, particularly for crew transport,” he said.

In other words, NASA was balking at this innovation, and was putting up so many obstacles that it just wasn’t worth the company’s effort at this time. NASA is their main customer for manned launches, and NASA doesn’t like daring or creativity or innovation. The powered version of Dragon will probably have to wait for other private customers looking for a way to get into space.

The third story outlines the engineering challenges that SpaceX has been dealing with in its effort to build the Falcon Heavy, and includes this tidbit from Musk:

With all of these elements in consideration, Mr. Musk is urging caution regarding public expectation for Falcon Heavy’s first flight, saying that there is a “real good chance that the first vehicle [won’t] make it to orbit. So I want to make sure to set expectations accordingly.”

Even more telling was how Musk continued on this point, stating that he hoped Falcon Heavy makes it far enough away from LC-39A before failing so the pad will escape significant damage. “I hope it makes it far enough away from the pad that it’s not going to cause damage. I would consider that a win, honestly,” said Mr. Musk.

Thank God NASA is not involved in the development of the Falcon Heavy. SpaceX would have probably had to abandon this as well.

Meanwhile, this detailed article by Eric Berger gives us Elon Musk’s position on NASA’s contracting system. Not surprisingly, much of what Musk says mirrors what I wrote in Capitalism in Space:

During his remarks Saturday, Musk said NASA could avoid unnecessary delays and costs by transitioning to a system of competitive awards for fixed-price contracts, in which companies are only paid when they meet “milestones” such as completing a flight test or satisfying NASA about the safety performance of a vehicle. Additionally, he said, at least two entities should compete during the development process.

There’s a lot more there, and it is worth a full reading.

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Has India cut its cubesat launch prices?

9:45 pm

Capitalism in space: A complex analysis of India’s recent launch prices suggests that ISRO reduced its cubesat launch prices when it launched a record-setting 103 satellites on the most recent PSLV launch.

The key paragraph however is this:

Small-satellite owners have long complained that the PSLV, whose reliability has been established in the market, has been slow to increase its launch tempo at a time of surging cubesat production. For the moment, none of these satellite customers’ launch options provide predictable launch cadence at affordable prices.

That may be about to change as several dozen vehicles designed specifically to accommodate the growing cubesat market are preparing to enter operations. Not all are likely to succeed in establishing a foothold, but the sheer number of them is impressive:

That makes it all the more important for ISRO’s Antrix Corp., the agency’s commercial arm, to cement a reputation for launch regularity and low prices.

In other words, because a flock of new smallsat launch companies, such as Rocket Lab, Vector, and Virgin Orbit, are about to enter the market ISRO is suddenly feeling the pressure, which is why they have cut prices as well as started to up their launch rate.

Isn’t competition wonderful?

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Sierra Nevada picks ULA’s Atlas 5 for first two Dream Chaser cargo flights

9:38 pm

Capitalism in space: Sierra Nevada has awarded ULA the contract for the first two cargo flights of Dream Chaser to ISS.

The announcement sets Dream Chaser’s first cargo flight to the International Space Station for launch from Cape Canaveral Air Force Station, Florida, in 2020. A second ISS cargo flight is contracted to lift off the next year. “ULA is an important player in the market and we appreciate their history and continued contributions to space flights and are pleased to support the aerospace community in Colorado and Alabama,” said Mark Sirangelo, corporate vice president of SNC’s Space Systems.

Financial terms of the contract were not disclosed.

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LISA Pathfinder switched off

8:17 am

After a successful mission proving the technology for a full scale orbiting gravitational wave detector, LISA Pathfinder was shut off yesterday.

After 16 months of science measurements an international team deactivated the LISA Pathfinder satellite on the evening of the 18th of July 2017. The gravitational-wave laboratory in space powered down after receiving the last commands in the evening and circles the Sun on a safe parking orbit. LISA Pathfinder has tested key technologies for LISA, the future gravitational-wave observatory in space, and has demonstrated their operative readiness. LISA is scheduled to launch into space in 2034 as an ESA mission and will “listen” to the entire Universe by measuring low-frequency gravitational waves.

The idea is laudable, but for Europe to need another seventeen years to build and launch the full scale telescope is absurd. They now know what needs to be done. It should be relatively easy and quick to get it into orbit. And even if it isn’t easy, seventeen more years? Give me a break.

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A map of Pluto

9:11 pm

Our best map of Pluto for many decades to come

The New Horizons science team has released the best maps of both Pluto and Charon possible from the images taken during the spacecraft’s fly-by of the ninth planet last year.

The new maps include global mosaics of Pluto and Charon, assembled from nearly all of the highest-resolution images obtained by New Horizons’ Long-Range Reconnaissance Imager (LORRI) and the Multispectral Visible Imaging Camera (MVIC). These mosaics are the most detailed and comprehensive global views yet of the Pluto and Charon surfaces using New Horizons data.

The new collection also includes topography maps of the hemispheres of Pluto and Charon visible to New Horizons during the spacecraft’s closest approach. The topography is derived from digital stereo-image mapping tools that measure the parallax – or the difference in the apparent relative positions – of features on the surface obtained at different viewing angles during the encounter. Scientists use these parallax displacements of high and low terrain to estimate landform heights.

You will also notice large areas of both Pluto and Charon that remain very fuzzy and unclear. What exactly is there will remain a mystery for many decades to come.

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Dream Chaser test vehicle undergoing tow tests

8:58 pm

Capitalism in space: Sierra Nevada’s Dream Chaser engineering test vehicle underwent tow tests today.

Rolling on two main landing gear wheels and a nose skid, the Dream Chaser traveled down a runway Monday in Sierra Nevada’s latest tow test at Edwards Air Force Base, which is co-located with NASA’s Armstrong Flight Research Center. Once cut free from its tow vehicle, the Dream Chaser slowed to a stop, allowing engineers to gather data on the craft’s brakes, steering system, and guidance, navigation and control sensors that will line the spaceplane up for landing, according to Eric Cain, a Sierra Nevada engineer who described Monday’s test on the company’s Twitter account.

More tests are planned in the coming months, including additional tow tests and a “captive carry” flight with the Dream Chaser suspended under a helicopter.

This is the same engineering test vehicle that underwent tow tests and flew successfully once, though its landing gear failed up upon touchdown. They have replaced that landing gear, which was borrowed from the Air Force and was never intended to be the spacecraft’s wheels. Thus, they need to go through these tests all over.

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NASA communications satellite damaged during launch prep

8:20 am

A NASA TDRS communications satellite, scheduled for a August 3 launch on a ULA Atlas 5 rocket, was damaged on July 14 while it was undergoing final preparations for launch.

Though the issue apparently involves one of the satellite’s main antennas, it is unclear what happened exactly or how extensive the damage was. Furthermore, this article about the incident notes that an earlier incident had also occurred during shipping.

It is understood this latest incident is not related to a ‘close call’ that NASA was investigating earlier in the flow. That incident involved the spacecraft’s shipping container – containing environmental instrumentation – which slid a couple of feet on the trailer it was being winched on to.

If I was a customer who might want to buy the launch services of ULA, I would demand detailed information about why these incidents happened, including what measures are being taken to prevent them from occurring again.

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First Starliner manned flight delayed to late 2018

9:24 pm

Boeing has revealed that the first manned flight of its commercial Starliner capsule will likely be delayed a few more months to late 2018.

The latest confirmed schedules from NASA show the uncrewed mission, dubbed the Orbital Flight Test (OFT), slated for No Earlier Than June 2018, followed quickly in August 2018 by the crewed flight test.

However, comments made by Chris Ferguson last month at the Paris Air Show seem to indicate that the crewed flight test is moving from its August timeframe. According to Mr. Ferguson, Director of Crew and Mission Operations for Boeing’s Commercial Crew Program, the first Starliner crewed test flight is aiming for “last quarter of 2018” – which would be a shift of two to five months into the October to December 2018 timeframe.

The unmanned test flight, however, remains set for a June 18, 2018 launch.

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Commercial space has won

1:12 pm

Today the Senate Subcommittee on Space, Science, and Competitiveness, chaired by Senator Ted Cruz (R-Texas), held the third of a series of hearings on the future regulatory framework required for American commercial space to prosper.

My previous reviews of the past two hearings can be found at these links:

In today’s hearing the witnesses in general once again called for a variety of reforms that would simplify the regulatory process for private enterprise. Dr. Moriba K. Jah, associate professor from University of Texas at Austin, suggested removing NOAA’s veto power on remote sensing, something that the proposed House bill I analyzed in my Federalist op-ed actually does). Jeffrey Manber of Nanoracks suggested giving the private sector a certain date when ISS will be decommissioned so that they can more easily obtain investment capital for building the privately-built space facilities that will replace it. Tim Ellis of Relativity, a company trying to build rocket engines manufactured entirely by 3D printing, called for more American spaceports, accessible by private companies, as well as a simplification of the FAA permitting process. Robert Cabana, Director at the Kennedy Space Center, talked about the need for government facilities to provide the infrastructure for private companies, as the center has done for the private launch sites and manufacturing facilities they have helped get established at Kennedy since the retirement of the shuttle.

Tim Hughes from SpaceX topped them all.
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Lunar landers/rovers for sale!

10:40 pm

Moon Express, one of the five finalists trying to win the Google Lunar X-Prize (GLXP) before it expires at the end of this year, announced today its long range plans, focused on building low cost lunar landers rovers, and sample return missions that could be purchased and launched for a tenth the cost of a typical government mission.

The GLXP mission won’t be the last lunar voyage for Moon Express, if all goes according to plan. Its deal with Rocket Lab covers up to five launches, and Moon Express wants at least two more to occur in the next few years, Richards revealed during a news conference today.

The first post-GLXP mission, scheduled to launch in 2019, will set up a robotic research outpost near the lunar south pole and prospect for water and other resources. Then, in 2020, Moon Express will launch the first commercial lunar sample-return mission. That effort, Richards said, should prove out the company’s technologies and its business model, which is centered around creating low-cost access to the moon’s surface for a variety of customers. The core piece of hardware to make all of that happen is a single-engine lander called the MX-1, which will launch on the GLXP flight. Moon Express aims to mass-produce the MX-1, sell it as a stand-alone lunar explorer and have it serve as a building block for three larger, more capable spacecraft — the MX-2, the MX-5 and the MX-9, Richards said today.

The MX-2 combines two MX-1s into a single package, boosting the MX-1’s payload capacity in Earth-moon space and potentially enabling missions to Venus or the moons of Mars. As their names suggest, the MX-5 and MX-9 incorporate five engines and nine engines, respectively, and broaden the exploration envelope even further, Richards said. All of these spacecraft will be available in orbiter, lander and deep-space variations, and the MX-5 and MX-9 vehicles will also come in a sample-return configuration.

Moon Express has not revealed how much it will charge for any of these spacecraft. However, company representatives have said that, together, the MX-1 and Electron can deliver a lunar mission for less than $10 million (that’s “cost,” not retail). Electron flights currently sell for about $5.5 million apiece, putting the lander’s raw cost at $4.5 million or less.

Essentially, they are taking the revolution in satellite technology that is making everything smaller and cheaper and applying it to planetary exploration. They are then offering this technology as a very cheap and fast option for scientists and governments. Based on these numbers, a mission to the Moon could cost a customer less than $20 million, which is nothing compared to a typical NASA mission. Even India’s Mars Orbiter was several times more expensive than this.

While I consider NASA’s planetary program second to none, and one of the best things it does, Moon Express is demonstrating, as has SpaceX with launch services, that private enterprise, if given the chance, can do it better.

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Juno images of Great Red Spot released

5:42 pm

The Juno science team has released the images taken by Juno as it flew past Jupiter’s Great Red Spot on June 11.

The three images at the link were all processed by citizen scientists, who took the raw images provided immediately and enhanced the colors. Not surprisingly, the images reveal that there are storms within storms within storms inside the Spot, which itself is a storm, the largest in the solar system.

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Mars rover update: July 12, 2017

2:49 pm

Summary: Curiosity looks at some big dune ripples, then creeps up hill. Opportunity tests its wheels.

Curiosity

For the overall context of Curiosity’s travels, see Pinpointing Curiosity’s location in Gale Crater.

The interior of a dune ripple

Since my last update on June 23,, Curiosity has worked its way around and, for a few days, even into the small sandy field at the base of Vera Rubin ridge. The scientists noticed that the sandy here had a series of large ripples, and they wanted to take a close look at at least one. The image on the right, cropped to show here, was taken shortly after they had the rover drive through one ripple in order to expose its interior. You can see the robot arm directly above the cut created by the rover’s wheels. On the cut’s wall several distinctly different toned layers are visible. A close look reveals that they are wavy, and probably indicate numerous and repeated overlays as the wind brushes a new layer of dust on top of old layers, time after time. The different tones indicate a change in the material’s composition, which could reveal something about some past events in either Mars’ weather or geology.

In order to decipher this information, however, they will need to be able to date the layers, and figure out when each tonal change happened. I am not sure Curiosity can do this, especially since they have not scooped up any of this dust for later analysis.

They are now approaching Vera Rubin Ridge, and should climb up onto in the coming weeks. At that point they will move off the Murray Formation, where they have been since March 2016, made up of dried and ancient crushed mud, and up onto a lighter, yellowish layer of rock, dubbed the Hematite Unit. This October 3, 2016 press release. gives a good outline of the geology of these regions.
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Africa and space

10:07 am

Link here. Prompted by the launch last week of Ghana’s first satellite from ISS, this article take a look at what other African countries are doing to become players in the new colonial movement, noting efforts being done by Nigeria, South Africa, Ethopia, Angola, and Kenya.

Overall, no African country is doing very much in space. The fact that this African-centered news outlet feels compelled to note this, however, suggests that the competitive urge might be stirring there.

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Navy temporarily relieves commander from ocean collision

10:59 am

The Navy has temporarily relieved the injured commander of the U.S.ship involved in a major ocean collision with a cargo ship in mid-June.

The investigation is on-going, and they say this action is because he is injured, not because of any decision based on the investigation. I personally do not expect this commander to ever get a command again.

For those that want to read a detailed discussion on Behind the Black of this incident, see this thread.

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