Tag: spaceflight

Vikram makes second and last lunar orbital change

9:40 am

The new colonial movement: India’s Vikram lunar lander today made its second and last orbital change, preparing itself for landing on the Moon on September 7.

The orbit of Vikram Lander is 35 km x 101 km. Chandrayaan-2 Orbiter continues to orbit the Moon in an orbit of 96 km x 125 km and both the Orbiter and Lander are healthy.

With this maneuver the required orbit for the Vikram Lander to commence it descent towards the surface of the Moon is achieved. The Lander is scheduled to powered descent between 0100 – 0200 hrs IST on September 07, 2019, which is then followed by touch down of Lander between 0130 – 0230 hrs IST

They plan to roll the rover Pragyan off of Vikram about two hours after landing.

This article provides a nice overview of the mission.

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SpaceX issues explanation for nonresponse in potential satellite collision issue

12:54 pm

SpaceX today issued an explanation for why it had not responded when ESA officials had asked them to change the orbit of one of its Starlink smallsats to protect against a possible collision with ESA’s Aeolus spacecraft.

SpaceX, in a statement Sept. 3, said it was aware of a potential conjunction Aug. 28 and communicated with ESA. At that time, though, the threat of a potential collision was only about 1 in 50,000, below the threshold where a maneuver was warranted. When refined data from the U.S. Air Force increased the probability to within 1 in 1,000, “a bug in our on-call paging system prevented the Starlink operator from seeing the follow on correspondence on this probability increase,” a company spokesperson told SpaceNews.

“SpaceX is still investigating the issue and will implement corrective actions,” the spokesperson said of the glitch. “However, had the Starlink operator seen the correspondence, we would have coordinated with ESA to determine best approach with their continuing with their maneuver or our performing a maneuver.”

This incident increasingly strikes me as a tempest in a teapot created by ESA for any number of reasons, including their overall dislike of SpaceX (for generally making all government-run space programs look foolish). There is also this quote from an ESA official in the article above:

“The case just showed that, in the absence of traffic rules and communication protocols, collision avoidance has to rely on the pragmatism of the involved operators,” Krag said. “This is done today by exchange of emails. Such a process is not viable any longer with the increase of space traffic.” He said that, if the Space Safety initiative is funded, ESA would like to demonstrate automated maneuver coordination by 2023. [emphasis mine]

I can just see ESA officials drooling with eager anticipation the coming of more “traffic rules and communication protocols,” partly inspired by this fake crisis they just created. Imposing more rules and getting increased funding is what they do best, since it certainly isn’t exploring space with creative and efficient innovation.

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Mars’ mysterious slope streaks become even more mysterious

10:10 am

Bright slope streaks in Arabia Terra
Click for full image.

Mars is an alien planet. This fact needs to be restated over and over, because we humans have an uncontrolled and unconscious tendency to view the things we find on Mars and assume they are caused by and resemble phenomenon we see all the time here on Earth.

Not. Mars has a very different climate, a significantly weaker gravitational field (about one third of Earth’s), and a geological and environmental make-up very alien from Earth’s. While many phenomenon there might have parallels on Earth, it is very dangerous to assume they are the same, because more often than not, they are exceedingly dissimilar and mysterious.

The image on the right is another example of this, reduced and cropped to post here. It is of some slope streaks in the Arabia Terra region on Mars, the largest most extensive region in the transition zone between the northern lowland plains and the southern highlands. I found it in my review of the August 30th release of new images from the high resolution camera on Mars Reconnaissance Orbiter.

As I already noted in my previous article about the mysterious slope streaks of Mars:

The bottom line, as noted in one paper, “The processes that form slope streaks remain obscure. No proposed mechanism readily accounts for all of their observed characteristics and peculiarities.”

Mars is strange. Mars is alien. Mars epitomizes the universe in all its glory.

The image above only reinforces this conclusion.
» Read more

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Hayabusa-2 in safe mode for one day on August 29

9:36 am

Japan’s Hayabusa-2 space probe automatically entered safe mode for one day on August 29, causing engineers to postpone a planned operation set for Sept 5.

Hayabusa2 is equipped with four reaction wheels that are used to control the posture of the spacecraft, and posture control is usually performed using three of these reaction wheels. On August 29, the back-up reaction wheel that has not been used since October last year was tested, and an abnormal value (an increased torque) as detected. The spacecraft therefore autonomously moved into the Safe-Hold state. Details of the cause of the abnormal torque value are currently under investigation. On August 30, restoration steps were taken and the spacecraft returned to normal. However, as the spacecraft moved away from the home position due to entering Safe-Hold, we are currently having to return to the home position. We will return to the home position this weekend.

The attitude of the spacecraft is controlled by three reaction wheels as before. Entering the Safe-Hold state is one of the functions employed to keep the spacecraft safe, which means that procedures have worked normally.

In this case it is very clear that this event actually demonstrated that the spacecraft’s systems are operating properly to prevent it from becoming lost. However, the event also underlined the urgency of getting its samples from the asteroid Ryugu back to Earth.

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Lunar lander company PTScientists purchased

9:28 am

Capitalism in space: The private commercial lunar lander company PTScientists has been purchased by an unknown investor, thereby avoid liquidation after declaring bankruptcy in July.

Berlin-based PTScientists and the law firm Görg, which handled the company’s bankruptcy administration, announced the acquisition in a German-language statement published Sept. 2. The announcement said neither the company buying PTScientists nor the purchase price would be disclosed, but that the deal was effective Sept. 1.

The acquisition, the announcement stated, allows PTScientists to retain its staff of about 60 people who had been working on lunar lander concepts, including a study for the European Space Agency of a mission to send a lander to the moon to perform experiments for in-situ resource utilization. ESA awarded that study to a team that included PTScientists as well as launch vehicle company ArianeGroup in January.

It seems that someone decided that this company was worth saving, and that it (and the private construction of private planetary missions) has the potential to make them money in time.

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Parker completes third fly-by of Sun

9:22 am

The Parker Solar Probe has completed its third close fly-by of the Sun.

At just before 1:50 p.m. EDT on Sept. 1, 2019, NASA’s Parker Solar Probe completed its third close approach of the Sun, called perihelion. At the time of perihelion, the spacecraft was about 15 million miles from the Sun’s surface, traveling at more than 213,200 miles per hour.

Mission controllers at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, received a green “A” beacon from the spacecraft soon after perihelion, meaning all systems were performing as designed and that the spacecraft was in good health.

As they had the science instruments turned on sooner during this close approach, and will let them operate longer afterward, they will get more data then on the previous two close approaches.

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Vikram completes first de-orbit burn

9:45 pm

The new colonial movement: India’s Vikram lunar lander has successfully completed its first de-orbit engine burn, lasting 4 seconds, adjusting its orbit slightly in preparation for landing on the Moon on September 7.

They will do a second burn tomorrow, further adjusting the orbit.

Note that the update says that this burn was by Chandrayaan-2, but this must be a mistake. The Vikram lander separated from the Chandrayaan-2 orbiter yesterday, and it is Vikram that is doing the orbital changes and will land on the Moon.

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SpaceX declines to shift Starlink satellite to avoid collision

2:12 pm

When European Space Agency (ESA) engineers realized there was a greater than normal chance that a new SpaceX Starlink satellite could collide with ESA’s already orbiting Aeolus satellite, they asked SpaceX to shift its orbit, only to have SpaceX decline.

According to Holger Krag, head of the Space Debris Office at ESA, the risk of collision between the two satellites was 1 in 1,000 – ten times higher than the threshold that requires a collision avoidance maneuver. However, despite Aeolus occupying this region of space nine months before Starlink 44, SpaceX declined to move their satellite after the two were alerted to the impact risk by the U.S. military, who monitor space traffic. “Based on this we informed SpaceX, who replied and said that they do not plan to take action,” says Krag, who said SpaceX informed them via email – the first contact that had been made with SpaceX, despite repeated attempts by Krag and his team to get in touch since Starlink launched. “It was at least clear who had to react. So we decided to react because the collision was close to 1 in 1,000, which was ten times higher than our threshold.”

As to why SpaceX refused to move their satellite, that is not entirely clear (the company did not respond to a request for comment). Krag suspected it could be something to do with SpaceX’s electric propulsion system, which “maybe is not reacting so fast” as the chemical propulsion on board Aeolus.

The article is clearly spun to make SpaceX look bad, though based on the stated facts the company shot itself in the foot quite ably. If their propulsion system could not have done the job as well as the other satellite, they should have simply said so and worked with ESA to get the issue fixed, rather than simply saying they would do nothing.

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Vikram has successfully separated from Chandrayaan-2

9:11 am

The new colonial movement: India’s lunar lander, Vikram, has successfully separated from Chandrayaan-2, and is functioning nominally in lunar orbit.

The update describing this is the second update at the link, with the first detailing the arrangements for the press to cover the landing on September 7.

The lander carries the rover, dubbed Pragyan, which will roll off Vikram only a few hours after landing.

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Chandrayaan-2 now in proper lunar orbit for release of lander/rover

7:45 pm

India’s Chandrayaan-2 spacecraft today completed its fifth engine burn in lunar orbit, placing it in the correct orbit for releasing its lander/rover.

The next operation is the separation of Vikram Lander from Chandrayaan-2 Orbiter, which is scheduled on September 02, 2019, between 1245 – 1345 hrs (IST). Following this, there will be two deorbit maneuvers of Vikram Lander to prepare for its landing in the south polar region of the moon.

The landing itself is scheduled for September 7.

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Has Yutu-2 found something unusual?

9:08 am

According to Chinese sources, China’s lunar rover Yutu-2 has spotted something unexpected and unusual on the surface of the far side of the Moon.

On July 28, the Chang’e-4 team was preparing to power Yutu-2 down for its usual midday ‘nap’ to protect the rover from high temperatures and radiation from the sun high in the sky. A team member checking images from the rover’s main camera spotted a small crater that seemed to contain material with a color and luster unlike that of the surrounding lunar surface.

The drive team, excited by the discovery, called in their lunar scientists. Together, the teams decided to postpone Yutu-2’s plans to continue west and instead ordered the rover to check out the strange material. With the help of obstacle-avoidance cameras, Yutu-2 carefully approached the crater and then targeted the unusually colored material and its surroundings. The rover examined both areas with its Visible and Near-Infrared Spectrometer (VNIS), which detects light that is scattered or reflected off materials to reveal their makeup.

VNIS is the same instrument that detected tantalizing evidence of material originating from the lunar mantle in the regolith of Von Kármán crater, a discovery Chinese scientists announced in May.

So far, mission scientists haven’t offered any indication as to the nature of the colored substance and have said only that it is “gel-like” and has an “unusual color.” One possible explanation, outside researchers suggested, is that the substance is melt glass created from meteorites striking the surface of the moon.

The report is at present too vague to really tell us anything. What I predict is that this discovery will almost certainly not be as strange or alien as this report makes it sound.

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China launches two smallsats

8:25 am

Using its Kuaizhou-1A solid rocket, China’s pseudo-private company ExSpace launched two smallsats into orbit yesterday.

This rocket, using technology developed for the military, including a mobile launch platform, is designed to compete directly with Rocket Lab and the other western private smallsat rockets trying to come on line right now. Its development appears to have been wholly funded by the Chinese government, which revealed after the launch that they plan between 8 and 9 more launches before the end of the year.

The leaders in the 2019 launch race:

14 Russia
14 China
10 SpaceX
6 Europe (Arianespace)
4 India
4 Rocket Lab
4 ULA

The U.S. continues to lead 19-14 in the national rankings.

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New Russia Soyuz spacesuits interfere with Russia pee tradition

9:49 am

Only in Russia: The newly designed Russian spacesuits for use by astronauts during ascent and descent in the Soyuz capsule apparently do not have a fly that will allow the continuation of a long-standing Russian tradition initiated by Yuri Gagarin on his way to the launchpad for his historic spaceflight.

The Sokol-M prototype suit was designed as a replacement for suits worn during launches to the International Space Station (ISS) on Soyuz spacecraft. … The maker of the suits, the aerospace firm Zvezda, says they will be made of new materials and adaptable to different body sizes.

But the new design makes it impossible to carry out one particular ritual launched by the first man in space, Yuri Gagarin, who had to relieve himself on the back wheel of the bus that was taking him to the launch pad in 1961.

The stop has been replicated at every launch from the Baikonur launch pad and, many male cosmonauts and astronauts pee on the tyre for good luck – something that would be impossible in the new suit, according to its maker. Female astronauts are not obligated to participate but some have brought vials of their urine to splash on the wheel instead.

“I’m not sure how they will be able to (carry on the tradition), since we haven’t designed the fly,” said the Zvezda director, Sergei Pozdnyakov, quoted by Russian agencies. “We have the design specifications. They don’t state that it’s necessary to pee on the wheel. The design specifications would need to be adapted.”

I suspect, knowing how important traditions and rituals are to the Russians, that the Russian government will require a design change to allow this tradition to continue.

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FAA required SpaceX to up its insurance for Starhopper test

9:40 am

The FAA’s office that regulates commercial space required SpaceX to increase its insurance coverage for this week’s Starhopper test to $100 million, thirty three times higher than their coverage for the previous Starhopper hops.

Lots of information at the link, though in summary it all makes perfect sense.

There are a number of likely reasons the federal regulator required SpaceX to boost its insurance coverage, says George Nield, a former FAA associate administrator who led its Office of Commercial Space Transportation (OCST) for more than a decade.

One is that Tuesday’s launch took Starhopper hundreds of feet higher than in July; during the prior flight, SpaceX’s vehicle only went about 60 feet (18 meters) up before landing. “The higher you want to go, the more propellant you’re going to have to load, and the more propellant you load, the bigger the boom if it were to explode,” Nield told Business Insider prior to Tuesday’s launch.

More importantly, their Boca Chica launch site is only a mile and a half from a small village of about twenty people, much closer than any other launchpad in the world. How SpaceX will manage this issue should they wish to test fly their fullscale Starship prototype from this site I really do not know. It could be that they won’t, and will confine all test flights to Kennedy, where they are also building a second Starship prototype.

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Kennedy Space Center prepares for hurricane

9:27 am

In preparation for the possibility of Hurricane Dorian’s arrival next week, the Kennedy Space Center is shutting down, including moving the giant mobile launcher vehicle, with the SLS launch tower on it, indoors to protect both.

The agency on Wednesday moved its hulking Apollo-era crawler-transporter out to Launch Complex 39B in order to bring the massive Mobile Launcher inside for the storm. That deployment must be made promptly because the crawler-transporter travels at just 1 mph (1.6 km/h).

The launch tower itself is 400 feet (122 meters) tall, which makes it a clear hazard in the high winds of a hurricane. NASA decided today (Aug. 29) that Dorian is threatening enough to merit moving the launch tower into Kennedy’s cavernous 52-story Vehicle Assembly Building for safety.

Their caution makes sense. Expect NASA to also announce that this two week delay in work will cause them several months more in delays to the SLS program. That has been their pattern over the years.

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ISS atmosphere issue?

9:19 am

Though NASA and Roscosmos both say the crews are in no immediate danger, alarms on ISS have indicated an issue with the oxygen levels on the station.

“The crew and the space station are in no immediate danger and are continuing normal operations,” the spokesperson said. “The overall atmosphere inside the station remains will below the O2 concentration limits. Teams are working to identify the root cause of the issue,” he added.

This report states that the problem is “the high oxygen content in the air in the Russian Zvezda module.”

If the problem was a drop in atmospheric pressure, the issue would likely be more serious, and suggest a repeat of the 2018 leak caused by a hole drilled in a Soyuz capsule. That the problem instead is high oxygen levels, suggests something more benign.

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OSIRIS-REx’s four candidate landing sites

9:07 am

The OSIRIS-REx engineering team has released a short video that flies over in close-up, showing the spacecraft’s four candidate sites on the asteroid Bennu, one of which will be where they will do a touch-and-go sample grab.

They continue to accumulate data on the four sites, all of which pose issues and risks because of nearby boulders and the looseness of Bennu’s rubble pile make-up.

Though all the sites are being considered, my sources in the industry suggest that the two dubbed Sandpiper and Nightingale are being favored. I like Osprey, because it is inside a crater and looks clear, but then, what do I know?

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Russia’s Rockot launches military geodesic satellite

8:51 am

Russia today used its re-purposed ballistic missile, Rockot, to launch the second in a two-satellite constellation of military geodesic satellites, designed to more accurately map the Earth’s gravitational field.

This launch puts Russia in the lead in the annual race for most launches for the first time since 2018. It also gives them more launches for the year than they had predicted. Both facts demonstrate that their launch industry is showing a recovery from the problems experienced in 2016, when they discovered corruption in one of their main rocket engine companies, requiring the recall of all engines.

The leaders in the 2019 launch race:

14 Russia
13 China
10 SpaceX
6 Europe (Arianespace)
4 India
4 Rocket Lab
4 ULA

The U.S. still leads Russia in the national rankings, 19 to 14.

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Cliff collapse on Mars

2:38 pm

Cliff collapse on Mars
Click for full image.

Cool image time! The photograph to the left, rotated, cropped, and reduced to post here, was found in the August image release of the high resolution camera on Mars Reconnaissance Orbiter (MRO).

This was an uncaptioned image, with a title “Cataract and Grooves in Kasei Valles.” Kasei Valles is the giant canyon north of Marineris Valles. Though it is not as well known or maybe as dramatic, it is about as long and vast as its more famous southern canyon. It also has some very intriguing features, including what I consider to so far be the pit on Mars with the highest priority for exploration.

The image on the right shows the result when a giant section of this cliff face broke off and collapsed into the canyon. It also shows that the collapse occurred a long time ago. Not only are there newer craters on the collapse debris, the breakdown at the cliff base looks well eroded, as if many eons have passed since it piled up there.

When this section broke off however it was a very big event. The width of the collapse is about a mile across, with its depth about 600 feet. The height of the cliff is approximately 3000 feet, give or take a few hundred feet. Thus the chunk that broke off was about 600 feet wide, 5,000 feet long, and about 3,000 feet high. That’s one very big rock.

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Apparent Iran launch failure

9:54 am

Just released satellite photos showing fire and smoke at an Iranian launchpad suggest that a rumored attempt by Iran this week to launch a satellite into orbit resulted instead in a launchpad failure.

[S]atellite images by Planet Labs Inc. showed a black plume of smoke rising above a launch pad there, with what appeared to be the charred remains of a rocket and its launch stand. In previous days, satellite images had shown officials there repainted the launch pad blue.

On Thursday morning, half of that paint apparently had been burned away. “Whatever happened there, it blew up and you’re looking at the smoldering remains of what used to be there,” said David Schmerler, a senior research associate at the Middlebury Institute of International Studies.

Schmerler told The Associated Press that the images of the space center suggested that the rocket either exploded during ignition or possibly briefly lifted off before crashing back down on the pad.

In July Iranian officials had said they would do three launches this year, with a communications satellite launch expected before the end of the summer. It would appear that this failure is of that launch.

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NASA Inspector General to Congress: Free Europa Clipper from SLS

8:44 am

In a letter to Congress on August 27, 2019, NASA’s inspector general has called for Congress to immediately abandon the legal requirement it imposed on Europa Clipper to fly on NASA’s SLS rocket, thereby allowing NASA to choose any commercial rocket to launch the spacecraft.

The letter [pdf] is amazingly blunt.

[W]e write to highlight an issue at NASA that we believe requires immediate action by Congress. Language in NASA’s appropriation legislation requires the Agency to launch a satellite to Europa, a moon of Jupiter, in 2023 on the yet-to-be-completed Space Launch System (SLS) rocket. However, because of developmental delays and, more significantly, NASA’s plans to use the first three SLS rockets produced for its Artemis lunar program, an SLS will not be available until 2025 at the earliest. Consequently, if completed on its projected schedule, the approximately $3 billion dollar Europa spacecraft (known as “Europa Clipper”) will need to be stored for at least 2 years at a cost of $3 to $5 million per month until an SLS becomes available. NASA recently added $250 million in Headquarters-held reserves to the project to address these storage and related personnel costs.

Congress could reduce risks to both the Europa mission and Artemis program while potentially saving taxpayers up to $1 billion by providing NASA the flexibility in forthcoming fiscal year (FY) 2020 appropriations legislation to determine the most cost effective and timely vehicle to launch the Europa Clipper mission in 2023 or whenever the satellite is completed.

As blunt as the letter is, the wording above is also very careful to hide the fact that the $1 billion savings will come, not from avoiding the launch delay, but from buying a private commercial launch vehicle (estimated launch cost about $100 million) versus using SLS (estimated launch cost of $1 billion to $4 billion).

Will Congress take this advice? It should, though I am pessimistic. Our Congress has not shown much interest in doing the smart thing when it comes to SLS for about a decade. Why should things change now?

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SpaceX begins hunt for Starship landing sites on Mars

3:07 pm

Candidate landing sites for SpaceX's Starship

In the August image release from the high resolution camera of Mars Reconnaissance Orbiter (MRO) were five images whose title immediately caught my interest:

The overview map on the right shows the location on Mars for these five photographs. The second and third images are of the same location, taken to produce a stereo pair.

To put it mildly, it is most intriguing to discover that SpaceX is beginning to research a place where it can land Starship on Mars. I immediately emailed Nathan Williams, the JPL scientist who requested these images from SpaceX, but he was bound by a non-disclosure agreement with SpaceX and could not comment. I have since tried to get some information directly from SpaceX but so far the company has not responded. A 2017 news story had indicated the company’s interest in this Mars’ location, but gave no details either.

Based on what we now know of Mars, however, it is possible to figure out why they favor this location, on the border between the two large northern lowland plains Arcadia and Amazonis Planitia.
» Read more

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Engineers attach test helicopter to Mars 2020

2:41 pm

Engineers have now attached to the Mars 2020 rover the test helicopter that will attempt to make the first air-born flight on another world.

The Mars Helicopter is considered a high-risk, high-reward technology demonstration. If the small craft encounters difficulties, the science-gathering of the Mars 2020 mission won’t be impacted. If the helicopter does take flight as designed, future Mars missions could enlist second-generation helicopters to add an aerial dimension to their explorations.

“Our job is to prove that autonomous, controlled flight can be executed in the extremely thin Martian atmosphere,” said JPL’s MiMi Aung, the Mars Helicopter project manager. “Since our helicopter is designed as a flight test of experimental technology, it carries no science instruments. But if we prove powered flight on Mars can work, we look forward to the day when Mars helicopters can play an important role in future explorations of the Red Planet.”

If this works on Mars, MiMi Aung will be in a position to win contracts for similar helicopters for the rest of her life. It seems to me that this project has been her baby from the beginning.

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Elementary students to name NASA’s 2020 Mars rover

12:58 pm

NASA announced today a contest among the nation’s elementary students to find a name for its Mars 2020 rover.

Starting Tuesday, Aug. 27, K-12 students in U.S. public, private and home schools can enter the Mars 2020 Name the Rover essay contest. One grand prize winner will name the rover and be invited to see the spacecraft launch in July 2020 from Cape Canaveral Air Force Station in Florida.

To enter the contest, students must submit by Nov. 1 their proposed rover name and a short essay, no more than 150 words, explaining why their proposed name should be chosen. The essays will be divided into three groups, by grade level – K-4, 5-8, and 9-12 – and judged on the appropriateness, significance and originality of their proposed name, and the originality and quality of their essay, and/or finalist interview presentation.

Fifty-two semifinalists will be selected per group, each representing their respective state or U.S. territory. Three finalists then will be selected from each group to advance to the final round.

As part of the final selection process, the public will have an opportunity to vote online on the nine finalists in January 2020. NASA plans to announce the selected name on Feb. 18, 2020 – exactly one year before the rover will land on the surface of Mars.

Obviously, there is a bit of hokum in this contest. The kids will make suggestions, the public will vote, but in the end NASA will make the selection. Requiring them to write short essays justifying their suggestion however is an excellent educational idea, and for this kudos to NASA.

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Webb assembled for the first time

12:50 pm

Northrop Grumman engineers have successfully completed, for the first time, the full assembly of the James Webb Space Telescope.

To combine both halves of Webb, engineers carefully lifted the Webb telescope (which includes the mirrors and science instruments) above the already-combined sunshield and spacecraft using a crane. Team members slowly guided the telescope into place, ensuring that all primary points of contact were perfectly aligned and seated properly. The observatory has been mechanically connected; next steps will be to electrically connect the halves, and then test the electrical connections.

…Next up for Webb testing, engineers will fully deploy the intricate five-layer sunshield, which is designed to keep Webb’s mirrors and scientific instruments cold by blocking infrared light from the Earth, Moon and Sun. The ability of the sunshield to deploy to its correct shape is critical to mission success.

Only a decade late and nine times over budget ($1 billion vs $9 billion). Let us all pray that when this spacecraft finally reaches its operational location a million miles from Earth it operates as designed.

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What Starhopper achieved

8:47 am

Starhopper in flight
Click for full image.

Captalism in space: While most news reports (including mine yesterday) have focused on the spectacular 150-meter flight of Starhopper, the real story here is the Raptor engine. As one of my readers said most succinctly in a comment:

As impressive as the flight was, there is so much more going on here. This is the most efficient rocket engine ever, with all fuel and LOX running through the combustion chamber – including exhaust from the turbopumps. The Russians tried it, and NASA tried it, but this is the first time such a design has flown. It’s also the first major engine using methane, so SpaceX is learning all the ground support processes for storing, fueling, and detanking methane (mostly) safely. (Still causing grass fires at launch…) They’re aiming for production cost below $2M per Raptor, and they’re about ready to go full production on the engines, around 500 engines per year.

In fact, Musk himself reveals the truth of Diane Wilson’s comment in a tweet, found in this news story about yesterday’s flight:

Starhopper’s flying days may be done, but the stubby prototype will be retasked rather than put out to pasture.

“Yes, last flight for Hopper. If all goes well, it will become a vertical test stand for Raptor,” Musk said via Twitter on Saturday.

In a sense, yesterday’s flight was no different. Starhopper was essentially a flying test stand for Raptor, which is in itself an incredible concept, when you think about it. Now it will continue to be used as a test stand, but will no longer fly.

I have been told by rocket engineers more than once that you need to build and test your engine before you can really start your rocket design. Once you know its capabilities you can then design and construct the rocket.

This is why Virgin Galactic’s SpaceShipTwo has generally been a failure. They built the ship before the engine, and when the engine had issues they had to improvise redesigns that have limited the ship’s capability and seriously delayed its launch.

SpaceX now has its engine ready. Construction on its two prototype Starships, in Boca Chica and Florida, will now proceed quickly. Based on how quickly it took SpaceX to do the first Starhopper test flights (announced in late 2018 and flying in about eight months), expect test flights within six to eight months. (Note that in this last link I expressed doubt they could get those Starhopper flights off in 2019. SpaceX proved me wrong.)

Finally, a minor news note: SpaceX today successfully brought a Dragon cargo capsule back to Earth after a month at ISS, completing its third flight in space. That this multi-use flight is hardly mentioned in the news illustrates how far SpaceX has reshaped space engineering in only a few years.

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Starhopper: Success!

2:37 pm

Starhopper in flight
Click for full image.

It appears today’s 150 meter hop (about 500 feet) of SpaceX’s Starhopper prototype was a complete success. To the right, and also below, are screen captures grabbed by me from one private live stream as well as from SpaceX’s own live stream.

In fact, this quick hop appears to have gone amazingly smoothly. It launched almost exactly at the target time, and landed quite softly on the launchpad, as intended. You can see the nozzle of the Raptor engine shifting and adjusting throughout the flight, also another indication that their engineering here is working perfectly. Congratulations SpaceX!

I have embedded SpaceX’s video below the fold. The flight begins around 30 minutes in.

Starhopper near the top of its flight

Starhopper beginning its descent

Starhopper on the ground
» Read more

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