Tag: engineering

SpaceX begins filling methane tanks at Starship launchsite in Texas

9:32 am

Capitalism in space: SpaceX has begun the slow process of filling the storage tanks at its launchpad in Boca Chica with the methane that will be used by its Starship and Superheavy rocket once launched.

To fill the two existing tanks, which may store enough methane to fuel a stacked Starship and Super Heavy about 4/5ths of the way, SpaceX will need around 40-50 more tanker deliveries. Since last November, SpaceX has completed more than 320 liquid nitrogen and 200 liquid oxygen deliveries – equivalent to about 6700 tons (~14.8M lb) of LN2 [liquid nitrogen] and 4200 tons (~9.3M lb) of LOx [liquid oxygen]. If SpaceX maintains that average and focuses entirely on LCH4 [methane], the two horizontal tanks could be filled to the brim before the end of February.

Having a substantial amount of [methane] stored at the orbital tank farm will finally allow SpaceX to attempt the first major wet dress rehearsals (WDRs) and, more importantly, the first full static fires with flightworthy Super Heavy booster prototypes. Of course, a tank farm with full supplies of LOx, LCH4, LN2, and their gaseous equivalents is also a necessity for the first orbital Starship launch attempt, which has most recently slipped from a target of mid-2021 to no earlier than (NET) Q2 2022, pending regulatory approval.

The article also notes that the way SpaceX built two vertical methane tanks at the launchpad appears in violation of Texas regulations, and might either need a waiver from the state or be rebuilt in order to be used. Subsequently the company has added two horizontal tanks that conform to regulations, and it is these tanks it is now filling. More tanks however will have to be added to give it the fuel needed for launch.

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Astronomers form lobbying group to block development on Moon’s far side

9:14 am

Lunar zone reserved solely for astronomers
Lunar zone reserved exclusively for radio astronomers

In order to allow them to someday in the future maybe consider the idea of possibly building space-based radio telescopes on the Moon, astronomers have now formed a new lobbying group to advocate the creation of a zone more than a thousand miles wide on the Moon’s far side where all future development will be forbidden.

The new committee is chaired by Claudio Maccone, an Italian SETI (search for extraterrestrial intelligence) astronomer, space scientist and mathematician. Maccone supports creation of a Protected Antipode Circle or PAC, a large circular piece of lunar landscape about 1,130 miles (1,820 kilometers) wide that would become the most shielded area of the moon’s far side.

“PAC does not overlap with other areas of interest to human activity,” he said. “PAC is the only area of the far side that will never be reached by the radiation emitted by future space bases located at the L4 and L5 Lagrangian points of the Earth-moon system.”

In view of these unique features, Maccone believes the PAC should be officially recognized by the United Nations as an international protected area, where radio contamination by humans is curbed, now and into the future.

In other words, these astronomers want to be given, for free, full ownership of the region in the center circle on the graphic above for future radio telescopes, even though at present they have no plans or projects to build such things.

Though the idea of creating a region protected from radio signals so that good radio astronomy can be conducted has merit, no one should have the slightest sympathy for this request by astronomers. Why should anyone give them this vast amount of real estate when astronomers have shown so little interest in building any telescopes in space, anywhere?

Only after the astronomical community finally proposes an actual radio telescope for installation at this site should this request be given the slightest attention. Before that, it is merely a stupid power grab by elitists who deserve nothing from nobody.

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SpaceX and Jared Isaacman announce another private Dragon flight

7:24 pm

Capitalism in space: SpaceX and Jared Isaacman, the man who organized and commanded the Inspiration4 private commercial manned Dragon flight last fall, today announced a second private commercial Dragon flight, scheduled for this coming fall.

SpaceX plans to launch a new private astronaut mission, Polaris Dawn, from Florida as early as Nov. 1 and will attempt to conduct the first private spacewalk in history, the company announced Monday.

Businessman Jared Isaacman, founder and CEO of the payments company Shift4, will command the mission, having previously he led the first all-private orbital mission in September known as Inspiration4. Isaacman is an experienced jet pilot.

The crew will also include two SpaceX engineers, Sarah Gillis and Anna Menon, as mission specialists and Isaacman’s business associate, Scott “Kidd” Poteet, as pilot.

The flight will attempt to achieve a higher orbit than even the highest flights during the U.S. space program’s Gemini missions that flew 853 miles above the Earth with astronauts Pete Conrad and Richard Gordon.

Isaacman has also tied this flight to more fundraising for St. Jude’s Children’s Research Hospital in Memphis, suggesting that he was very happy with the charity received in connection with his Inspiration4 spaceflight. If this new flight comes off as planned, Isaacman will follow it up with two more SpaceX manned flights.

For the spacewalk, SpaceX will have to complete the development of its own EVA spacesuit, and have four suits available for the crew since Dragon capsules do not have an airlock.

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A floating Martian rock

9:21 am

Mosiac of top of butte
For original images, click here and here.

A floating Martian rock
Click for original photo.

Cool image time! As Curiosity begins the slow and careful journey up through the rocky Gordon Notch onto the even rockier Greenheugh Pedimont layer above, the science team is using its cameras to take pictures of the buttes that form the northern and southern walls of that notch.

The mosiac above and the photo to the right, both cropped and reduced to post here, is one beautiful example. Taken by Curiosity’s high resolution camera on February 11th, both images show the consequences on geology of Mars’ low gravity, one third that of Earth’s. The top image shows the entire top of the butte, with the picture to the right focusing on one boulder that almost seems to be floating in the air. Look close and you can see daylight under the rock’s entire left half.

I think this butte is the north wall of Gordon Notch, but am not sure. Either way, the photos once again demonstrate that it is very dangerous to assign our Earth-based assumptions to Martian geology. There may be similarities, but the differences must not be ignored, or else our conclusions about what we see will be wrong.

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Lockheed Martin cancels merger with Aerojet Rocketdyne

8:52 am

Capitalism in space: Faced with a lawsuit from the Federal Trade Commission (FTC) opposing the merger, Lockheed Martin yesterday announced that it is terminating its effort to buy Aerojet Rocketdyne.

Aerojet released a press release at the same time, insisting that the company remains viable and healthy, but there are doubts. While its rocket engines (its main business) remain technically reliable and well-built, they are relatively expensive. Moreover, the shift by rocket companies to build their own engines in the last decade has reduced its customer base significantly.

This loss of market is now compounded by a battle between two factions on the company’s board of directors.

While monopolies do not encourage competition, the merger with Lockheed Martin would have been mostly good for the rocket industry. It would have quickly given Lockheed Martin the skills to make rockets, and kept Aerojet Rocketdyne alive, albeit as part of another company. Now the latter faces extinction, and the former will need more time to develop the capabilities required in its recently-won NASA contract to launch a rocket from Mars to return samples.

And once again, the FTC lawsuit indicates that the Biden administration has decided to take a heavy-regulatory hand when it comes to business. The result however of this approach in this case has not produced more competition, but the likely bankruptcy of at least one company.

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Rocket stage to hit Moon is from Chinese rocket, not Falcon 9 upper stage

6:22 pm

Astronomers have now concluded that the rocket stage that will impact the Moon on March 4th is not an abandoned the Falcon 9 upper stage that launched the DISCOVR satellite in 2015, but an upper stage from a Chinese rocket.

It was an engineer at NASA’s Jet Propulsion Laboratory, Jon Giorgini, who realized this object was not in fact the upper stage of a Falcon 9 rocket. He wrote to Gray on Saturday morning explaining that the DSCOVR spacecraft’s trajectory did not go particularly close to the Moon, and that it would therefore be a little strange if the second stage strayed close enough to strike it. This prompted Gray to dig back into his data, and identify other potential candidates.

He soon found one—the Chinese Chang’e 5-T1 mission launched in October 2014 on a Long March 3C rocket. This lunar mission sent a small spacecraft to the Moon as a precursor test for an eventual lunar sample return mission. The launch time and lunar trajectory are almost an exact match for the orbit of the object that will hit the Moon in March.

Regardless, it will be very useful to pindown the exact impact time and place so that astronomers can observe it.

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Global image of Mars from UAE’s Al-Amal orbiter

10:23 am

Mars as seen by Al-Amal in January 2022
Click for original image.

Cool image time! The United Arab Emirates (UAE) today released several new images taken by its Al-Amal Mars orbiter, showing the changing atmospheric conditions on Mars between September ’21 and January ’22.

The photo to the right, cropped and annotated by me, is the January image, showing the dust storm conditions that presently exist in the equatorial regions of Mars. The lighter puffy cloud-like features in the center of the image are a 1,500 mile wide dust storm centered on the equator. The white dot indicates the approximate spot where Perseverance sits in Jezero Crater, within that storm.

The previous Al-Amal image from September (available at the link) shows the whole Martian hemisphere with generally clear skies.

Below is a recent photo taken by Perseverance illustrating these dusty conditions.
» Read more

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ESA selects Ariane-6’s first payloads

9:05 am

The European Space Agency (ESA), ArianeGroup, and Arianespace today announced the payloads that will fly on the first launch of its new Ariane-6 rocket.

The payloads are a variety of cubesats and science experiments, none heavier than 175 pounds with a total payload weight less than one ton. These secondary payloads will either be deployed from or kept attached to a dummy mass that will simulate a large primary satellite payload.

The press release makes no mention of a launch date, as has been the pattern in the last few Ariane-6 press releases. The last release to mention a launch date was in October 2020, which then predicted a launch in the second quarter of ’22. That this date is no longer being mentioned suggests the date has been pushed back, though for how long remains a mystery.

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First image from Webb released

8:52 am

Webb's first released alignment image

It ain’t pretty, nor is it in optical wavelengths, but the first alignment image from the James Webb Space Telescope has been released by NASA.

That image, reduced slightly to post here, is to the right. It shows 18 different near-infrared images of the same star, each image taken by a different segment of Webb’s primary mirror. At the moment the mirrors are not perfectly aligned, so that each segment’s star image shows up at a slightly different place. The goal now will be to adjust those mirror segments so that future images will show only one star, all focused to the same spot.

This alignment process is expected to take about a month.

The image is significant however because it shows that each segment is producing a relatively sharp image, even though the telescope has not yet cooled to its operating temperature. It thus appears that, unlike Hubble, Webb’s mirror segments were ground correctly, and it will be able to take sharp images right off the bat.

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Musk: “We need to seize the opportunity and do it as quickly as possible.”

9:54 pm

Raptor engine
Raptor-1 on the left, Raptor-2 on the right

The headline quote above encapsulates the main philosophical point of Elon Musk’s presentation tonight in Boca Chica, Texas. Musk’s presentation was focused mostly at outlining the status of SpaceX’s Starship/Superheavy reusable heavy-lift rocket, but he started his talk stating his philosophical reasons for doing what he is doing.

It is his strong belief that in order to guarantee the survival of all life on Earth, we must colonize as many planets as possible. Musk’s quote above indicated his sense that this effort must be done now. As he had noted,

The window of opportunity [to build human settlements on other worlds] may be open for a long time, and I hope it is, but it may also be open for a short time. And this is the first point in the four and half billion history of Earth that it is possible.

He added, “To be frank, civilization is feeling a little fragile these days,” which makes achieving his goal quickly even more urgent.

After making this point, Musk then proceeded to outline what they’ve accomplished so far in building Starship/Superheavy, and what they hope to do in the coming years. Much of what Musk said was largely known, such as the size and power of Starship and its design. He did underline these important details:
» Read more

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