Monthly Archives: June 2019

Asteroids & Comets, Solar Science, Space Science

Space sciences roundup – June.5.2019

A sampling of recent articles, videos, and images from space-related science news items:

[ Update: The InSight Mars lander team has come up with a plan for diagnosing and then testing a possible fix for the ground temperature probe that is stuck at a depth that is too shallow to do its job correctly: InSight’s Team Tries New Strategy to Help the ‘Mole’ | NASA

More details on the problem in this earlier report: More Testing for Mars InSight’s ‘Mole’ – NASA’s InSight Mars Lander

]

** A binary asteroid zipped past earth recently: Binary asteroids, key to Earth’s planetary defence – ESA

Humankind has had its closest look yet at a binary asteroid. As 1999 KW4 skimmed past our planet at 70 000 km/h, the most advanced visible-light telescope on Earth resolved the 1.3-km diameter asteroid and its 360-m sized moon. An even closer spacecraft-based encounter will come next decade, when NASA will send a probe to deflect the moon of the distant Didymos binary. Then ESA’s Hera mission will perform a follow-up survey right down to the body’s surface.

The International Asteroid Warning Network (IAWN) coordinated a cross-organisational observing campaign of the asteroid 1999 KW4 as it flew by Earth, reaching a minimum distance of 5.2 million km on 25 May. Since its orbit is well known, scientists were able to predict this flyby and prepare the observing campaign.

Side by side observation and artist's impression of Asteroid 199
“The unique capabilities of the SPHERE instrument on ESO’s Very Large Telescope have enabled it to obtain the sharpest images of a double asteroid as it flew by Earth on 25 May. While this double asteroid was not itself a threatening object, scientists used the opportunity to rehearse the response to a hazardous Near-Earth Object (NEO), proving that ESO’s front-line technology could be critical in planetary defence. The left-hand image shows SPHERE observations of Asteroid 1999 KW4. The angular resolution in this image is equivalent to picking out a single building in New York — from Paris. An artist’s impression of the asteroid pair is shown on the right.” – ESA

** Update on Japan’s Hayabusa2’s visit to Ryugu, a near-earth asteroid: Hayabusa2 drops second target marker, targets artificial crater for sample collection | The Planetary Society

Japan’s Hayabusa2 spacecraft has successfully dropped a second target marker on Ryugu. The reflective softball-sized sphere, which contains the names of Planetary Society members and other supporters, will give the spacecraft a visual guide if mission planners send it back to the surface to attempt a second sample collection.

JAXA is now considering collecting the sample directly from the area where Hayabusa2 created an artificial crater in early April, thanks to updated imagery collected during an aborted touchdown marker drop attempt in mid-May.

Hayabusa2 second target marker drop
“Hayabusa2 drops its second marker on asteroid Ryugu from an altitude of about 10 meters on 30 May 2019. These images were taken from altitudes between 10 and 40 meters.” Credits: JAXA, Chiba Inst. of Tech. Via The Planetary Society

** Comets provided earth with much of its water: Comet Provides New Clues to Origins of Earth’s Oceans – NASA JPL

The mystery of why Earth has so much water, allowing our “blue marble” to support an astounding array of life, is clearer with new research into comets. Comets are like snowballs of rock, dust, ice, and other frozen chemicals that vaporize as they get closer to the Sun, producing the tails seen in images. A new study reveals that the water in many comets may share a common origin with Earth’s oceans, reinforcing the idea that comets played a key role in bringing water to our planet billions of years ago.

The Stratospheric Observatory for Infrared Astronomy, SOFIA, the world’s largest airborne observatory, observed Comet Wirtanen as it made its closest approach to Earth in December 2018. Data collected from the high-flying observatory found that this comet contains “ocean-like” water. Comparing this with information about other comets, scientists suggest in a new study that many more comets than previously thought could have delivered water to Earth. The findings were published in Astronomy and Astrophysics Letters.

** Jupiter’s magnetic field exhibits unexpected variations over time: Juno space probe identifies changes in Jupiter’s magnetic field – Physics World

An important question for the researchers to answer now is what is the cause of the shift in Jupiter’s magnetic field? On Earth, the change is thought to originate in the planet’s core, however the best explanation for secular variation on Jupiter is in its deep atmospheric (zonal) winds. These winds extend up to 3000 km into the surface of the planet, where the conductive metal fluid is situated. Although the origin of zonal winds is still uncertain, they are believed to interrupt the magnetic field distribution.

The discovery will likely have implications for the study of our Solar System. Kimee Moore, a graduate student  from the University of Cambridge and lead author of the report on the findings, says that in the future “scientists will be able to make a planet-wide map of Jupiter’s secular variation” and this latest finding may even help “scientists studying Earth’s magnetic field, which still contains many mysteries to be solved”

** Latest on the Sun’s spot count: Sunspot update May 2019: The long ramp down | Behind The Black

The Sun in May continued to show the exact same amount of activity as it had shown for March and April. This steady uptick in sunspot activity once again shows that the ramp down to full solar minimum will be long and extended.
…
That we are definitely ramping downward to minimum, even with the slight increase in the past three months, is shown by the fact that the Sun has shown no sunspots for the past fifteen days. In fact, all the activity shown in May comes from the first half of the month. This pattern is actually a reflection of the Sun’s 27-day rotation period. …

** A film of a solar eclipse in 1900 was found and restored: First movie of solar eclipse rediscovered | Behind The Black

The magic of a real solar eclipse filmed on 28 May, 1900 by a famous magician, Nevil Maskelyne, while on an expedition by The British Astronomical Association to North Carolina. In 1898 he travelled to India to photograph an eclipse. He succeeded but the film can was stolen on his return journey home.

It was not an easy feat to film. Maskelyne had to make a special telescopic adapter for his camera to capture the event. This is the only film by Maskelyne that we know to have survived. The original film fragment held in The Royal Astronomical Society’s archive has been painstakingly scanned and restored in 4K by conservation experts at the BFI National Archive, who have reassembled and retimed the film frame by frame.

The film is part of BFI Player’s recently released Victorian Film collection, viewers are now able to experience this first film of a solar eclipse since the event was originally captured over a century ago.

** The Stars of Cepheus as seen by NASA’s Spitzer Space Telescope:

Soar through this cosmic landscape filled with bright nebulas, as well as runaway, massive and young stars. The image comes from NASA’s Spitzer Space Telescope, which sees the universe in infrared light. For more about Spitzer, visit https://www.nasa.gov/spitzer or http://www.spitzer.caltech.edu/.

** Mars:

*** An update on Europe’s ExoMars Rover mission, which ESA plans to launch in July 2020 for a landing in March 2021: ESA Prepares for ExoMars Rover 2020 Launch at Mars and on Earth | The Planetary Society

Preparations for the ExoMars rover mission are in their final stages. ESA made two announcements today: ExoMars Trace Gas Orbiter is shifting orbit, and they officially opened a new Rover Operations Control Centre (ROCC) in Turin, Italy. ROCC will support the Rosalind Franklin rover’s deployment from the Kazachok lander and surface operations after that. Along with the announcements they posted some cool images.

*** Ten things about Mars are revealed in an interactive display from ESA.

*** Signs of even more water on Mars:

From Space.com:

Scientists think they’ve stumbled on a new cache of water ice on Mars — and not just any ice but a layered mix of ice and sand representing the last traces of long-lost polar ice caps.

That’s according to new research based on data gathered by NASA’s Mars Reconnaissance Orbiter, which has been circling the Red Planet since 2006 and has just marked its 60,000th trip around Mars. On board the spacecraft is a radar instrument that can see about 1.5 miles (2.5 kilometers) below the planet’s surface — and in that data, scientists see lots and lots of ice.

Alternating ice and sand layers on Mars
“A composite image showing alternating layers of ice and sand in an area where they are exposed on the surface of Mars. The photograph, taken with the HiRISE camera aboard NASA’s Mars Reconnaissance Orbiter, was adjusted to show water ice as light-colored layers and sand as darker layers of blue. The tiny bright white flecks are thin patches of frost.” Credit: NASA/JPL/University of Arizona. [Via AGU.org]
*** The Space Show – Fri, 05/24/2019 – Dr. Gilbert Levin and Dr. Patricia Ann Straat talked about the “Viking Labeled Release experiment, life detection on Mars, From Mars With Love by Dr. Straat and more”.

*** Mars reports from Bob Zimmerman:

**** Rover update: May 30, 2019 – Latest on Curiosity’s explorations (and also an update on China’s Yutu-2 rover on Moon). The image below

… one of a number taken by the rover in the past week, showing water clouds drifting over Gale Crater.

Mars clouds as seen by Curiosity
Mars clouds over Gale crater as seen by Curiosity. Via Behind the Black.

According to NASA JPL:

These are likely water-ice clouds about 19 miles (31 kilometers) above the surface. They are also “noctilucent” clouds, meaning they are so high that they are still illuminated by the Sun, even when it’s night at Mars’ surface. Scientists can watch when light leaves the clouds and use this information to infer their altitude.

But Curiosity wasn’t just looking at the clouds:

While these clouds teach us something about Martian weather, the big rover news this week was that the data obtained from the two drill holes taken in April show that the clay formation that Curiosity is presently traversing is definitely made of clay, and in fact the clay there has the highest concentration yet found by the rover.

**** Crater? Pit? Volcano? – A puzzling feature might be an impact crater but maybe not:

I would not bet much money on this conclusion. The overall terrain of the Eridania quadrangle is filled with craters, large and small. There does not seem to be any obvious evidence of past volcanic activity, and if there had been it has not expressed itself in large volcanoes.

Eridania crater
This circular feature in the Eridania region could be a meteoroid crater or a volcano caldera. Via Behind the Black.

However, other images of this mountain show many circular features that at first glance appear to be craters like the featured image. They appear slightly raised above the surrounding terrain, though not in as pronounced a manner.

They all could be small volcanoes. Or maybe they are impacts that hit a dense surface which prevented them from drilling too deep down, and instead caused the crater to be raised above the surrounding terrain.

‘Tis a puzzle. The irregular pit in this particular feature adds to the mystery. It does not look like the kind of pits one sees in calderas. Instead, its rough edge suggests wind erosion.

**** The mysterious slope streaks of Mars – Streaks on the sides of sloped surfaces are puzzling…

… and appear to possibly represent a phenomenon entirely unique to Mars. I became especially motivated to write about these mysterious ever newly appearing features when, in reviewing the May image release from the high resolution camera on Mars Reconnaissance Orbiter (MRO), I found four different uncaptioned images of slope streaks, all titled “Slope Stream Monitoring.” From this title it was clear that the MRO team was re-imaging each location to see if any change had occurred since an earlier image was taken. A quick look in the MRO archive found identical photographs for all four slope streak locations, taken from 2008 to 2012, and in all four cases, new streaks had appeared while older streaks had faded.

Example of streaks on Martian slopes.
Example of streaks on Martian slopes. Via Behind the Black

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Brief Answers to the Big Questions
– Stephen Hawking

Rockets, Spaceflight & Parabolic Flight

Space tourism roundup – June.4.2019

A sampling of recent articles, videos, and images related to commercial human space travel:

** Beth Moses talks about her SpaceShipTwo flight and what she is doing to prepare others for such flights:

Describe to me the experience of being in space. We all saw that picture of you staring out the window in complete awe.

It was just magic and almost indescribable.

I felt very fortunate to fly where I did and the day I did. I felt like the Earth was so beautiful, but even more so than you can describe or can be imagined. I happened to fly on a day where we had snow on the mountains in the southwestern United States. And I remember vividly that appearance of glistening white mountaintops and blue Pacific Ocean and the green of the Earth. I told someone the other day I felt like Earth was wearing her diamonds for us that day, because it was so, so glistening and sharp.

It just took my breath away. It was amazing

“The face you make when you look back on Earth from space. Our Chief Astronaut Instructor, Beth Moses, is the 571st person to fly to space and the first woman to fly on board a commercial spaceship.” – Virgin Galactic

Clash: Compare the real flight to the simulations.

Moses: The Gz [force through the head] was of a much lower duration. I reached our expected Gz on boost and re-entry, but was pleasantly surprised at how short it was. It just ramps up and then ramps off. You take a breath and realize, ‘Oh this is high G,’ and you take another breath and say, ‘Oh, this is high G.’ By the time you’ve finished your second breath, it’s done, and you’re back to normal G. The Gz felt like the centrifuge, but the Gx [force through the chest] I didn’t perceive as strongly as I did in the centrifuge. I don’t know why. Maybe it was because I was so happy to be going up. So Gz felt like the NASTAR centrifuge, Gx did not. Both maximums were about 3.6.

Clash: Will you fly again?

Moses: I would love to go back up, but I also want to get future astronauts up there as fast as possible. So it depends on what we still have to test, how many test flights we have and for what reasons. We’re actually still mapping that out. But I will not nominate myself. There are lots of other skill-sets and factors that need to be tested, so I will train other folks to do those tests. I’m not trying to blindly hog evaluations. But if there are evaluations that need my particular skill-set, I might fly again. We’re still working that out.

** Richard Branson remains steadfastly upbeat about Virgin Galactic’s prospects: Richard Branson: We’re at the dawn of new era of space exploration (Opinion) – Richard Branson/CNN

I said after the flight on December 13, as I stood with our pilots, Frederick “CJ” Sturckow and Mark “Forger” Stucky, that when you set off on important adventures, exceptional people come forward to join the journey — people who are consistently by your side and on your side, people who share your dreams and people who help make them reality. Reaching space has been the ultimate team effort.

It is evident that we are finally at the dawn of a new age of space exploration, which will see reusable space vehicles built and operated by commercially successful private companies, transforming our business and personal lives in ways that we have yet to comprehend fully.

Standing on the flight line, I could hear my dad in the back of my mind saying, as he often did, “Isn’t life wonderful?”

** Land Rover designed the Astronaut Edition Range Rover just for “Virgin Galactic’s Future Astronaut customers”:

** Suborbital space tourism will be a lot safer than climbing Mt. Everest, thankfully: Everest deaths: Four reasons why this climbing season went wrong – BBC News

Over the past two decades, the average annual death rate of climbers on Mount Everest has remained at about six.

But this spring, at least 10 people have already been reported dead or missing on the world’s highest peak.

This is also the season that saw a record 381 climbing permits issued by the Nepalese government.

In reality, this means about 600 people were preparing to embark on the climb, with permit holders accompanied by support staff up the mountain.

** Virgin Galactic & Blue Origin near space tourism operations. VG is currently installing the interior seating in a SpaceShipTwo rocketplane and plans to begin flying customers this year. Blue Origin expects to fly people on the New Shepard for the first time in 2019, though ticket sales have yet to begun. So suborbital space tourism may finally get off the ground this year:  Suborbital space tourism nears its make-or-break moment – The Space Review

After the Ansari X Prize was won in October of 2004, I was sure that there would be regular space tourism services available by 2008. (I lost a bet, in fact, that there would be services by then.) Here it is 15 years later and I’m still waiting to see routine flights of public citizens to the edge of space.

This is disappointing for sure but it is hardly unusual that a technology takes a lot longer than expected to reach the market.

I enjoy listening to Jonathan Strickland on the TechStuff Podcast tell captivating stories behind the development and commercialization of technologies. He explains the science and engineering in a clear and straight-forward manner while also drawing fine verbal portraits of the fascinating characters involved and vividly depicting the often bitter and complex battles among them.

Many of the technologies we take for granted today saw decades pass between the initial key invention(s) and commercial success. I just listened, for example, to a podcast about compact audio cassette tapes and another on video cassettes. (These are in a series from Strickland on the development of media starting with records and films.) While not nearly as challenging as high altitude rocket transportation, there was still a considerable gap between the initial invention of flexible audio tape in Germany in the 1930s and high-fidelity audio cassettes in the 1970s.  The first video tape recorders appeared in the 1950s but the first successful home video recorders didn’t appear until the mid-1970s.

Technological devices typically involve multiple sub-technologies that must work well together as a system. Finding the optimum combination of technologies that synergize into an affordable, practical product seldom happens on the first try. Instead an evolutionary competition occurs with the fittest combo eventually winning after a long struggle that leaves behind a trail of failed designs and bankrupted companies.

In the mid-2000s, there was at least a half-dozen companies making serious efforts at a suborbital vehicle for space tourism. There was no grand overarching roadblock that a few keen outsiders saw that the companies didn’t. Rather, each encountered particular individualized hurdles that tripped them up.

For example, Virgin Galactic could have developed a SpaceShip 1.5 vehicle that involved modest improvements to the 3-seat SpaceShipOne and starting flying within a couple of years after the XPRIZE. Burt Rutan has said he had customers requesting flights on the SpaceShipOne. Instead, VG decided to jump straight to an elaborate 8-person vehicle. Unfortunately, the company ran into tremendous difficulties in scaling up the hybrid rocket motor used on the SS1 and even today does not have a motor that can send the SS2 above 100 km, which was the altitude boundary for the XPRIZE.

XCOR made good progress on low-cost, reliable liquid-fueled rocket engines but could not raise sufficient funding to bring the Lynx spaceplane to fruition. Rocketplane Ltd.‘s design based on a converted Learjet turned out not to be viable and by the time they changed the design they were out of money. Similarly, TGV Rockets fell short of funding to build the Michelle-B, a vertical takeoff and landing rocket vehicle similar to Blue’s New Shepard.

Blue Origin had plenty of funding but, after flying a couple of prototype vehicles, the company decided to focus on developing a new liquid hydrogen propulsion system that could be used for the booster of a suborbital vehicle and also for the upper stage of an orbital launcher. A highly reusable LOX/LH2 engine is no trivial technology so there’s little surprise it took them a few years to develop.

The suborbital space tourism story is just another confirmation that a new technology needs multiple entrants, all trying their hardest to make their designs work.

So, if the SpaceShipTwo and New Shepard vehicles do start flying regularly, does that guarantee a successful space tourism business? No, of course, not. No untried business is a guaranteed success. However, there are many positive signs.

For example, several hundred people have signed up for SS2 flights and most have waited patiently for many years. Only a few percent canceled after the 2014 accident and many of these dropped out not because of safety concerns but because they were discouraged by the additional years of waiting to fly.

If 600 people each year attempt to scale Mt. Everest, despite an annual average of 6 deaths, just to brag about the ordeal they overcame, we can be sure there will be no shortage of customers willing to pay for the totally unique thrill of riding a rocket straight up to the edge of space and encountering the awesome view of a glittering cosmos above and a glistening Earth below.

** A UBS Global Research view of commercial space travel:

** Russia’s KosmoKurs (КосмоКурс) is developing a suborbital vertical takeoff and landing rocket vehicle similar to Blue Origin’s New Shepard and also intended for tourism services. Like the New Shepard, up to six passengers would ride in a capsule that detaches from a booster and returns via parachutes. The goal is to build the vehicle by 2023.

** A customer for a Circumlunar Mission offered by Space Adventures wanted his deposit back as delays grew ever longer: Space Adventures reaches settlement with would-be lunar tourist – SpaceNews.com

[Harald] McPike, an Austrian businessman and adventurer who lives in the Bahamas, filed the original suit in May 2017, seeking the return of a $7 million deposit he paid to Space Adventures for a $150 million seat on a Soyuz mission that would go around the moon, and additional damages. The defendants in the suit included Space Adventures; Tom Shelley, the company’s president; and Eric Anderson, the company’s chairman and chief executive.

According to McPike’s suit, he contacted Space Adventures in July 2012 about the possibility of flying on a mission around the moon that the company had been promoting for several years. In March 2013, he signed an agreement committing to participate in such a mission, and paid an initial deposit of $7 million towards the $150 million total price with the expectation that the mission would take place within six years.

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Space 2.0: How Private Spaceflight, a Resurgent NASA,
and International Partners are Creating a New Space Age

Space Policy

Space policy roundup – June.3.2019

A sampling of links to recent space policy, politics, and government (US and international) related space news and resource items that I found of interest:

Webcasts:

** First Meeting of the 2019 NASA Advisory Council:

NASA Administrator Jim Bridenstine gave remarks during a meeting of the NASA Advisory Council (NAC) on May 30 at NASA Headquarters in Washington DC. The Council meets several times a year for fact finding and deliberative sessions. Meetings are held at NASA Headquarters in Washington, DC, as well as at NASA Centers across the country.

** Commercial Lunar Payload Services Contracts, Goddard Space Flight Center, May 31, 2019

** May 31, 2019 Zimmerman/Batchelor podcast | Behind The Black

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Safe Is Not an Option

Activism, Space Policy, SpaceCasts

The Space Show this week – June.3.2019

The guests and topics of discussion on The Space Show this week:

This week David Livingston is attending the National Space Society‘s annual conference – ISDC 2019 – in Washington, D.C. So there will be no Space Show webcasts until next week. 

Some recent shows:

** Sun, 06/02/2019 – Science fiction author and professional space historian, Gideon Marcus talked about his Galactic Journeys. website, “a portal to 55 years ago in science fact and fiction, covering the Space Race, the books, the movies, and the culture of the early 1960s”.

** Fri, 05/31/2019 –  Dr. Greg Matloff and C. Bangs “discussed their book, Stellar Engineering, terrestrial & possible alien megastructures & concepts for advanced civilizations outside our solar system”.

** Tue, 05/28/2019 – James Donovan talked about his new book, Shoot for the Moon: The Space Race and the Extraordinary Voyage of Apollo 11, and about “space policy, returning to the Moon, lessons learned, space and humanity plus more”.

** Fri, 05/24/2019 – Dr. Gilbert Levin and Dr. Patricia Ann Straat talked about the “Viking Labeled Release experiment, life detection on Mars, From Mars With Love by Dr. Straat and more”.

See also:
* The Space Show on Vimeo – webinar videos
* The Space Show’s Blog – summaries of interviews.
* The Space Show Classroom Blog – tutorial programs

The Space Show is a project of the One Giant Leap Foundation.

The Space Show - David Livingston

Rockets, Space Systems

Space transport roundup – June.3.2019

A sampling of recent articles, videos, and images dealing with space transport:

** Lightning strikes Soyuz 2-1B rocket during ascent but launch on May 27th successful anyway:

** Russian Proton rocket launches Yamal-601 geostationary communications satellite on May 30th:

** Stratolaunch appears to be shutting down: Exclusive: Space firm founded by billionaire Paul Allen closing operations – sources – Reuters

** Sierra Nevada Corp’s patented VORTEX® rocket engine was test fired in a public demo: Ozmens’ SNC Test-fires Next-Gen Rocket Engine in Prep for U.S. Launches – SNC

SNC Vortex Engine Test
SNC Vortex engine test firing. Credits: SNC

** SNC will support upgrades to the Japanese next-gen ISS cargo vehicle: Ozmens’ Sierra Nevada Corporation to Provide Hardware for Japanese HTV-X International Space Station Missions – SNC

… HTV-X is the advanced version of H-II Transfer Vehicle (HTV). The spacecraft will provide supplies to the Kibō Japanese Experiment Module and the International Space Station for future servicing missions.

The HTV-X spacecraft is developed and operated by the Japanese Aerospace Exploration Agency (JAXA), with primary sections of the vehicle being manufactured by Mitsubishi Heavy Industries (MHI) and Mitsubishi Electric Corporation (MELCO).

** Nozzle blows off during test firing of Northrop-Grumman solid fuel booster:

N-G management is downplaying the incident but I’m sure the USAF will want the problem found and fixed before the OmegA can be considered for defense payloads.

[ Update: Scott Manley analyzes the incident:

]

** An update on Gilmour Space Technologies, an Australian/Singapore company developing a SmallSat launcher with a hybrid motor propulsion system: Building a rocket in a garage to take on SpaceX and Blue Origin – CNET

GIlmour’s suborbital One Vision rocket “is slated to launch in late June”. If that goes well they will proceed with development of the orbital

… three-stage rocket dubbed “Eris,” it will blast off to low Earth orbit, dropping off small satellites 100 miles (160 kilometers) above the surface.

“Eris is a three-stage vehicle, so it has three separate stages that fire individual sections,” Gilmour explains. “We have designed it to be able to take all of the known small satellites that are being built and designed right now, into space.”

The company has started work on Eris, and completion is tentatively scheduled in for 2020.

** Rocket Crafters tests 2.5 kN Cyclone hybrid motor:

This test is the most recent demonstration of Rocket Crafters new 2.5 kN (550 lbf) Cyclone Labscale testing engine. The Cyclone Engine uses a combination of the patent pending STAR-3D (Safe, Throttleable, Affordable, Reliable, 3D-Printed) Fuel Grain and VIFFI (Vortex Flow-Field Injector) technologies. The engine was fired for five seconds at 50% throttle and performed even better than expected with a maximum thrust of 1.5 kN (340 lbf)! Notice how smooth the plume from the engine is, it is much steadier and smoother than that what would be observed from a traditional Hybrid Rocket Engine. In addition, the top view is taken from a GoPro mounted to the Oxidizer Tank for the Engine, because it is attached to the test stand any vibrations from the Engine would be seen from this view.

** Firefly Aerospace releases payload users guide for the Orbital Transfer Vehicle (OTV), which uses solar electric propulsion to move payloads to a desired orbit:

** A Chinese rocket company tests a thruster system:

** More about university student rocket teams:

[ Update: The team fell short of 100 km but still reached a high altitude: College Rocket-Builders Are Flying High, Even as Launch Falls a Bit Short – WSJ

But in the middle of their flights, the rockets ran into an issue and fell short of hitting the Karman Line, an international standard for the boundary between earth’s atmosphere and space at 62 miles up.

“The bottom line is, from the start, it wasn’t really about the small technical details,” said Saad Mirza, a 19-year-old Princeton University student who was the team’s technical lead. “The real fact is we beat pretty much every odd.”

After spending innumerable hours working toward getting to space and falling short, the team members weren’t upset. Oddly enough, they were giddy.

There were technical triumphs to celebrate. The second-stage ignition, they felt, was a major accomplishment. Both rockets took off “straight as an arrow,” Mr. Mirza said. And even without getting to space, the rockets still got quite high. (They are still going through data to determine the exact height.)

]

** Misc.

** SpaceX:

*** SpaceX CRS-17 Dragon leaving the ISS this morning for a splashdown in the Pacific: NASA TV Set to Air US Cargo Ship Departure from Space Station | NASA

Filled with more than 4,200 pounds of valuable scientific experiments and other cargo, a SpaceX Dragon cargo spacecraft is set to return to Earth from the International Space Station Monday, June 3. NASA Television and the agency’s website will provide live coverage of the craft’s release beginning at 11:45 a.m. EDT.

Around noon, flight controllers at mission control in Houston will deliver remote commands to the station’s Canadarm2 robotic arm to detached Dragon from the Earth-facing port of the Harmony module. Expedition 59 Flight Engineer David Saint-Jacques of the Canadian Space Agency will back up the operation and monitor Dragon’s systems as it departs the orbital laboratory.

After firing its thrusters to move a safe distance away from the station, Dragon will execute a deorbit burn around 4:56 p.m. to leave orbit, as it heads for a parachute-assisted splashdown in the Pacific Ocean, 202 miles southwest of Long Beach, California, at 2:55 p.m. PDT. There will be no live coverage of deorbit burn or splashdown.

A view of the splashdown target area:

The Dragon is currently the only vehicle that can return substantial amounts of cargo from the ISS: Science Results Packed for Return to Earth Aboard Dragon Monday – Space Station

*** Two launches set for June. The following dates are still “no earlier than” and the specific launch window times are not yet posted.

  • June 11: Vandenberg AFB, Pad SLC-4E – Falcon 9 with three spacecraft for the Canadian Radarsat Constellation.
  • June 22: Kennedy Space Center, Pad 39-A – Falcon Heavy with USAF STP-2 Mission with 24 military and scientific research satellites.

[ Update: A time has been released for the FH launch:

]

*** Falcon Heavy STP-2 launch system components are on site and in assembly: SpaceX’s next Falcon Heavy hits milestone as final rocket parts arrive in Florida – Teslarati

*** Planetary Society’s LightSail-2 arrives at Cape for launch on the SpaceX Falcon Heavy. LightSail 2 Arrives in Florida | The Planetary Society

*** The Falcon 9 booster for the launch for the 60 Starlink satellites returned to Port Canaveral last week (videos via www.USLaunchReport.com):

*** Update on the Starlink satellites: SpaceX says all 60 Starlink satellites functioning so far – SpaceNews.com

All 60 satellites — the first in a constellation that could one day number 12,000 — have deployed solar arrays, a SpaceX spokesperson said in a May 31 statement, and most are in the process of climbing from their 440-kilometer drop-off point to their 550-kilometer target orbit.  

“SpaceX continues to monitor the constellation for any satellites that may need to be safely deorbited,” the spokesperson said. “All the satellites have maneuvering capability and are programmed to avoid each other and other objects in orbit by a wide margin.”

*** Starhopper & Starship orbiter demonstrators:

**** Raptor engine being installed on the Starhopper test vehicle this weekend but just for fit checks:

From SNF:

For instance, up until recently, the company was planning to utilize Raptor SN4 for the untethered hops. However, the company has now decided to utilize this engine only for fit checks, and will instead perform the hops with SN5 – the latest Raptor to come out of SpaceX’s factory in Hawthorne, California.

SN4 arrived in Boca Chica for the fit checks on Friday afternoon. Meanwhile, SN5 is already at SpaceX’s test facility in McGregor Texas for verification testing before being shipped south.

While the precise reason for the engine change is unknown, by still shipping SN4 to Boca Chica first, SpaceX will be able to ensure that the Starhopper is ready for hopping ahead of SN5’s arrival. This should help to reduce the delays caused by waiting for SN5.

Some pictures:

***** Starships may become single-stage point-to-point transports:

**** An examination of the latest iteration of the design of the Super Heavy Booster/Starship combo:  Initial BFR (Starship) is not much more powerful than Falcon Heavy | Selenian Boondocks

BFR is now no longer absurdly over-sized at all. That talking point is over. It’s easily within their demonstrated capability. Fewer staging events also helps. And landing the Super Heavy booster may be easier than landing 3 separate cores simultaneously (no one knows right now). They switched from carbon fiber to stainless steel for fabrication, but that’s probably a step in the right direction if you want the vehicle to fly realsoonnow. Hypothetically (with almost balloon tanks), stainless has the same mass fraction as a carbon fiber (which needs design knock-downs for cryogenics and oxygen, particularly with out-of-autoclave processes) and similar to SpaceX’s current aluminum-lithium alloy. In practice, it seems SpaceX is still literally hammering out the manufacturing process. They have a method that seems to work with Starhopper, but the mass fraction is terrible (built literally by a water tower company). It seems almost like Sea Dragon.

But they don’t HAVE to have extremely good mass ratio. The upper stage doesn’t HAVE to have SSTO-like capability, not at first. It just needs enough to get to orbit with significant payload, say 50 tons. Perhaps it just needs 6.5km/s. That’s also about the delta-v needed to go from the Gateway to LLO then to the lunar surface and back (well, that’s about 6.2km/s total… 5.2km/s if you’re aggressive with your burns).

*** A talk by Paul Wooster of SpaceX at the recent Humans to Mars Summit in Washington, D.C. (starts at around 00:23:00) – Getting to the Moon and Mars:

Wooster also participated in the afternoon panel session titled, Session 1b: Surface Operations on Mars (starts at around 7:05:00 into the video).

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