Tag: engineering

Oblique view of Ceres’s bright spots

3:58 pm

Occator Crater on Ceres

Cool image time! The image above is a newly released image of Occator Crater on Ceres, the location of the dwarf planet’s double bright spots, taken by Dawn in October.

I have cropped the image to focus on the crater and the bright spots. Unlike most previous images, this one is taken from an angle to bring out the topography, which also confirms what other data had shown, that the bright spots are not on top of any peaks. If anything, they appear to be located at low spots in the crater, as that previous data had suggested.

Though the spots are not really very bright, they are very bright relative to the dark surface of Ceres. This is why it is difficult to get a good image of them. Either you have to over-expose the spots to see the surface details around them, or under-expose the surface around them to see some detail in the spots. This image tries to find a middle ground.

Eventually they will move Dawn in very close to try to get higher resolution images of the spots alone. At that time we might finally be able to get a better understanding of what causes them.

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Lisa Pathfinder lifts off

8:42 am

Lisa Pathfinder, an experimental probe to test the technologies for measuring gravity waves in space, was successfully launched today by Arianespace’s Vega rocket.

At its core is a pair of free-floating, identical 46 mm gold–platinum cubes separated by 38 cm, which will be isolated from all external and internal forces acting on them except one: gravity. “LISA Pathfinder will put these test masses in the best free-fall ever produced in space and monitor their relative positions to unprecedented precision,” says Karsten Danzmann, who also is the Co-Principal Investigator for the LISA Pathfinder Technology Package, the scientific heart of the satellite. “This will lay the foundations for future gravitational-wave observatories in space such as eLISA.”

It is important to point out that this probe will not measure gravity waves. It doesn’t have the sensitivity to do it. Instead it is testing the engineering, as described above, for building a later probe that will have sensitivity. To gain that sensitivity the floating cubes must be much farther apart, and likely will require several independent satellites flying in formation.

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Next Falcon 9 first stage to touch down on land?

12:16 am

The competition heats up: SpaceX is considering an attempt to land its Falcon 9 first stage on land in its next launch in two weeks.

Carol Scott, who works technical integration for SpaceX within NASA’s Commercial Crew Program, told reporters here at the Cape Canaveral Air Force Station today that SpaceX’s first attempt at a land-based rocket landing may be coming sooner than the public expects. “You know how they want to fly the stage back, right? Their plan is to land it out here on the Cape [Canaveral] side,” Scott told reporters.

The company declined to comment on Scott’s remarks, which are vague enough to leave them plenty of wiggle room. Not that it matters. Even if they attempt the next first stage landing on a barge, a landing on land will soon follow. It is only a matter of time.

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The first Ceres atlas

3:46 pm

Ceres's first atlas

Using data during Dawn’s first orbit of Ceres German scientists have compiled a global atlas of the dwarf planet.

The images used for this are the wide angle survey images, which won’t show the smallest objects because they were taken from about 2,700 miles above the surface. Nonetheless, this atlas gives scientists a baseline for studying the giant asteroid.

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Scientists begin another attempt to drill through the Earth’s crust

9:26 am

An expedition to the Indian Ocean is about to begin an effort to drill a core down through the Earth’s crust and into its mantle.

Geologists have been trying to drill through the contact between the crust and the mantle, called the Moho, since the 1960s, with no success. Either the projects have gone way over budget and been shut down, have failed due to engineering problems, or were stopped by the geology itself. This last issue is maybe the most interesting.

Expeditions have come close before. Between 2002 and 2011, four holes at a site in the eastern Pacific managed to reach fine-grained, brittle rock that geologists believe to be cooled magma sitting just above the Moho. But the drill could not punch through those tenacious layers. And in 2013, drillers at the nearby Hess Deep found themselves similarly limited by tough deep-crustal rocks

This new project hopes to learn from these past problems to obtain the first rock samples from below the Earth’s crust.

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Turning planes into trucks

9:14 am

The competition heats up: Airbus has patented a concept for having the cargo/passenger section of an airplane modular and removable.

Instead of a single hull, aeroplanes would essentially be built with a hole in their fuselage between the nose cone and the tail section, into which modular compartments could be fitted and removed. The compartments, which could take on the purpose of a passenger, luxury passenger or freight unit, would be transferred between the aircraft and airport via a docking module, which according to Airbus would (ideally) be integrated into airport terminal buildings.

For passenger planes this idea really doesn’t work. However, for cargo it is brilliant. Like trucks, it allows cargo to be loaded without using the expensive flight infrastructure.

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Deposed XCOR founders form new company

9:04 am

The competition heats up? The founders of XCOR, who only weeks ago were pushed out in a management reorganization, have teamed up again to form a new company.

Forgive me if I am as skeptical of this new company as I am of XCOR. I’ve looked at all the news articles describing this new company, and see little there that excites me. Lots of talk about new management ideas and agile production efforts, but in the end nothing that suggests anything revolutionary.

These guys had more than a decade at XCOR to produce something and essentially never did. Why should I think they will do it now, just because they are hanging a different company name on their sign?

Don’t get me wrong. I will be the first to celebrate if they make something happen. I just remain exceedingly skeptical.

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Russia describes its planned first manned Moon mission

8:46 am

To accomplish its first manned lunar landing, tentatively set for 2029, Russia will have to launch six Angara rockets.

According to the source, the launches are planned to be carried out in pairs from the Vostochny cosmodrome (the Amur region in Russia’s Far East) and the Plesetsk cosmodrome (Archangelsk region in the northwest) with small intervals between the blast-offs. Under the proposed scheme, after the orbit placement, the complex with a total weight up to 70 tonnes will be docked with the manned spacecraft, after which it will fly to the Moon. A payload of 18-20 tonnes will be delivered to the lunar orbit by the end of the mission.

According to a preliminary plan, Russia’s first manned flight to the Moon is possible in 2029. One year ahead of that it is planned to conduct a flight around the Moon, the testing and qualification of space systems for the future manned landing. However, this project may become a reality only if the work to create a new-generation manned transport spacecraft, the Angara-A5 rocket, lunar boosters and other needed rocket and space technology and infrastructure is included in the draft Federal Space Program for 2016-2025.

The final draft Federal Space Program, however, has not yet been approved. This story is obviously a lobbying effort within Russia to get this lunar mission included in that master plan.

What strikes me most about all this is the timing. The big national space programs, Russia, China, and NASA’s SLS, are all aiming for big lunar missions in the late 2020s. All will spend a lot of money for a very limited number of flights, mostly single stunts that merely demonstrate that they can do it. None of these programs will have much staying power on the Moon.

Private space is likely aiming for the Moon as well, and will likely be capable of getting there about the same time. However, private space will be cheap and designed to go many many times (for profit). Watching this race between nations and private companies is going to be quite fascinating. And unlike the 1960s space race, which was a race between two different top-down government programs, this 2020s space race will be between bottom-up capitalism versus top-down government.

I think in the end the governments will be very embarrassed. They will either lose, or act to squelch their private competition.

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John Williams – Flying theme from ET

6:01 pm

An evening pause: I have always thought Steven Spielberg’s E.T. The Extra-Terrestrial (1982) to be incredibly over-rated, poorly edited, shallow with a predictable script, and not very interesting. Why the public went mad for it in 1982 always baffled me. Nonetheless, Williams’ score was and is magnificent, and a listen here might explain that madness somewhat.

Hat tip Danae.

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The jets of Enceladus

9:09 am

Enceladus's jets

Cool image time! The image above, taken in June by Cassini, shows the night side of Saturn’s moon Enceladus, framed by Saturn’s rings, and faintly showing the jets of water coming from its south pole. To show it here I have cropped it and reduced it somewhat, as well as brightened the jets to make them more visible.

The release notes how the image compares the frozen water of Saturn’s rings and the liquid activity of Enceladus’s jets. I note how the image is simply beautiful. Be sure to click on the link to see the full resolution image.

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The launch cost of Japan’s H-IIA rocket

9:51 am

The competition heats up: Yesterday’s launch of Japan’s first commercial payload on its upgraded lower cost H-IIA rocket suggested that they are now a serious player in the competitive launch market. What the earlier articles didn’t tell me was the cost they charge to launch a payload on H-IIA.

This article today states that each launch costs 10 billion yen, which translates to about $80 million. That is about $10 million more than SpaceX charges for its Falcon 9, but is certainly cheaper than many other rocket companies. At this price they have a chance of grabbing some of the launch market, but to really compete they need to cut that cost even more, which the article suggests their next rocket will succeed in doing: “The government is developing a new core rocket named the H3, whose launches are expected to cost only about a half of the H2A.”

They do not say whether H3 will be reusable, but at $40 million per launch it will be the cheapest rocket on Earth. That it is government developed however makes me skeptical they will succeed. We shall see. What is clear, however, is that the competition is certainly encouraging the lowering of cost.

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Blue Origin lands first stage rocket vertically

8:34 am

The competition heats up: Yesterday Jeff Bezos’s company Blue Origin did its second test flight of its New Shepard suborbital rocket and capsule, and successfully recovered the rocket’s first stage, landing the stage vertically using its rockets.

As Jeff Bezos wrote at the link:

Rockets have always been expendable. Not anymore. Now safely tucked away at our launch site in West Texas is the rarest of beasts, a used rocket.

This flight validates our vehicle architecture and design. Our unique ring fin shifted the center of pressure aft to help control reentry and descent; eight large drag brakes deployed and reduced the vehicle’s terminal speed to 387 mph; hydraulically actuated fins steered the vehicle through 119-mph high-altitude crosswinds to a location precisely aligned with and 5,000 feet above the landing pad; then the highly-throttleable BE-3 engine re-ignited to slow the booster as the landing gear deployed and the vehicle descended the last 100 feet at 4.4 mph to touchdown on the pad.

When you watch the video you’ll see that we took the liberty of engineering all the drama out of the landing.

I have posted video of the flight below the fold.

SpaceX has been attempting this with its orbital Falcon 9 rocket for the last two years. They have come very close, hitting their target and almost landing. They plan to try again in December. Blue Origin however has beaten them to it, even if they have done it with a suborbital rocket.This demonstrates unequivocally that the concept is sound and that a rocket’s first stage can be recovered. It also demonstrates that of all the rocket companies in the world, SpaceX and Blue Origin are in position to dominate for at least the next decade. I am very confident that SpaceX will succeed in its efforts to recover its first stage. I am also very confident that Blue Origin’s plans to upgrade New Shepard into an orbital rocket/capsule will proceed quickly.

In both cases, the companies will then move forward, capable of recovering and reusing significant parts of their rockets, thus making it possible to significantly lower the launch cost and thus charge their customers less. No one else is in this position, or even close to it. The launch market will belong to them.
» Read more

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NASA contracts Aeroject Rocketdyne to build shuttle engines for SLS

5:27 pm

The competition heats up? NASA has awarded Aerojet Rocketdyne a $1.4 billion contract to restart production on the space shuttle engines, with the intent to use those engines for its hoped-for missions beyond Earth orbit using the Space Launch System (SLS).

Normally I am thrilled when an American company gets a contract to build rocket engines, but here I have my doubts. This contract will only produce deep space engines if Congress gives NASA the money to fly SLS on deep space missions. Right now, Congress has only given NASA just enough money to fly one, maybe two SLS missions, with the second not coming until 2024 at the earliest. My impression of this contract award thus is that it is not to produce engines, but to keep Aerojet Rocketdyne from going bust, since no one else has been interested recently in buying their engines. In other words, it is pork, government money handed out in order to keep the people who work for Aerojet employed.

This is not the way to become a space-faring society. Better Aerojet Rocketdyne goes bust and the good engineers that work for it find jobs with companies making products that people want. Then, the government money can be spent wisely on things that we will eventually want and use, instead of make-work projects that accomplish nothing.

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NASA contracting development of new ion/nuclear engines

8:51 am

The competition heats up: NASA has awarded three different companies contracts to develop advanced ion and nuclear propulsion systems for future interplanetary missions, both manned and unmanned.

These are development contacts, all below $10 million. However, they all appeared structured like NASA’s cargo and crew contracts for ISS, where the contractor does all of the development and design, with NASA only supplying some support and periodic payments when the contractor achieves agreed-upon milestones. Because of this, the contractors will own the engines their develop, and will be able to sell them to other customers after development, thereby increasing the competition and innovation in the field.

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Dawn’s first close look at Ceres’s poles

10:59 am

Ceres's poles

The Dawn science team have released their first images of the north and south poles of Ceres.

The region around the south pole appears black in this view because this area has been in shade ever since Dawn’s arrival on March 6, 2015, and is therefore not visible. At the north polar region, craters Jarovit, Ghanan and Asari are visible, as well as the mountain Ysolo Mons. Near the south pole, craters Attis and Zadeni can be seen.

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