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https://twitter.com/cbs_spacenews/status/1575588748842381313

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HST/SpaceX: Patrick Crouse, HST project manager, says Hubble is in good health, but atmospheric drag eventually will bring it down, likely in the mid-to-late 2030s; says NASA will closely study any emerging reboost plan to ensure nothing is done to impact its normal operation
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In this proposal, the center of the station does not need not be the center of rotation.

If the long tube-like section is supposed to be rotating, then what you are proposing is highly unstable, and likely can't work.

Referencing the intermediate axis theorem (Wikipedia link):

1. What appears to the space station would be (e1), and it tumbles end over end to create gravity. By itself that works.

2. Whatever unbalanced (or even balanced) mass you have jutting out from the side at the center of rotation becomes (e2), which due to even small sources of friction or torque, will cause that whole "arm" to start rotating perpendicular to the station portion (e1).

The result is a jumbled mess that happens before the Starship in your diagram tries to dock - which means it can't dock.

The intermediate axis theorem is real, and you can't keep assuming that masses will be fixed in place just because we want them to be. Masses in space will move based on ANY forces operating on them, in all three axis.

The best way to handle this is to have a 1st and 3rd axis of rotation be so overwhelming that the secondary axis forces can't overwhelm them. Which your design does not take into account.

Does it help me if I say i did not illustrate the actual station ring because it wasn't what I was trying to demonstrate?
I think I understand the stability question, this was an attempt at illustrating a transfer method :)
The station would look something like this.  But the ring is not the item I want to discuss, it's just a visual place holder.  what interests me is the method of transfer from the rotating ring to the non rotating section.
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https://www.nasa.gov/feature/goddard/2022/nasa-spacex-to-study-hubble-telescope-reboost-possibility

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Sep 29, 2022
NASA, SpaceX to Study Hubble Telescope Reboost Possibility

NASA and SpaceX signed an unfunded Space Act Agreement Thursday, Sept. 22, to study the feasibility of a SpaceX and Polaris Program idea to boost the agency’s Hubble Space Telescope into a higher orbit with the Dragon spacecraft, at no cost to the government.

There are no plans for NASA to conduct or fund a servicing mission or compete this opportunity; the study is designed to help the agency understand the commercial possibilities.

SpaceX – in partnership with the Polaris Program – proposed this study to better understand the technical challenges associated with servicing missions. This study is non-exclusive, and other companies may propose similar studies with different rockets or spacecraft as their model.

Teams expect the study to take up to six months, collecting technical data from both Hubble and the SpaceX Dragon spacecraft. This data will help determine whether it would be possible to safely rendezvous, dock, and move the telescope into a more stable orbit.

“This study is an exciting example of the innovative approaches NASA is exploring through private-public partnerships,” said Thomas Zurbuchen, associate administrator for the Science Mission Directorate at NASA Headquarters in Washington. “As our fleet grows, we want to explore a wide range of opportunities to support the most robust, superlative science missions possible.”

While Hubble and Dragon will serve as test models for this study, portions of the mission concept may be applicable to other spacecraft, particularly those in near-Earth orbit like Hubble.

Hubble has been operating since 1990, about 335 miles above Earth in an orbit that is slowly decaying over time. Reboosting Hubble into a higher, more stable orbit could add multiple years of operations to its life.

At the end of its lifetime, NASA plans to safely de-orbit or dispose of Hubble.

“SpaceX and the Polaris Program want to expand the boundaries of current technology and explore how commercial partnerships can creatively solve challenging, complex problems,” said Jessica Jensen, vice president of Customer Operations & Integration at SpaceX. “Missions such as servicing Hubble would help us expand space capabilities to ultimately help all of us achieve our goals of becoming a space-faring, multiplanetary civilization.”

The Hubble Space Telescope is a project of international cooperation between NASA and ESA (European Space Agency). NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Space Telescope Science Institute (STScI) in Baltimore, Maryland, conducts Hubble science operations. STScI is operated for NASA by the Association of Universities for Research in Astronomy in Washington.

Media Contacts:

Karen Fox / Alise Fisher
NASA Headquarters, Washington

Last Updated: Sep 29, 2022
Editor: Rob Garner
Tags:  Goddard Space Flight Center, Hubble Space Telescope, Universe
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Q&A

Q from Bill Harwood CBS - understand a study only... is the goal to use a PD mission to reboost.  and what is the latest entry projection? (

A: Jared: this study is for all servicing missions but Hubble focused. If a mission is possible, it fits within the parameters for Polaris and builds on the first (Dawn) mission...   Patrick: Reentry projection 5050 for 2037

Q from Michael Sheets CNBC - Can you talk about more polaris goals... If P 2 uses a dragon, would it do this? or something else

A: Jared: Polaris is all about tech demos. New or expanded capabilities that are necessary to make life multiplanetary, or utilizing tech that hasn't been demostrated foir a long time... PD 1 has an EVA, van allen etc...   Thomas Z: we did not talk about this in detail, we are just looking and learning. .... this may extend to things like Chandra as well.. but it's their program to develop the details. Jessica: when we do new devt we look to see the costs and schedule, what does it take to make it happen safely. Protecting Hubble is paramount. Not going to risk it. After studies we will look to see how it goes
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Jared: 2nd Polaris mission is a possibility to do this if the study confirms its appropriate
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This is great news, even if it's just a study at this point.

Question- will Isaacman be paid by NASA for this? Or, given a flight was planned anyway, will it be more a case of 'seeing as you're in the neighbourhood, can you do us a favour?'
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Note the idea originated with SpaceX:

https://twitter.com/thesheetztweetz/status/1575584925582913536

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Zurbuchen: "A few months ago SpaceX approached NASA with the idea for a study of how a commercial crew could help boost our Hubble spacecraft into a higher orbit, that would extend its observational lifetime."

NASA & SpaceX signed a Space Act Agreement for a feasibility study.
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Space Science Coverage / Re: NASA - Juno - Updates
« Last post by ugordan on Today at 08:46 pm »
One of the first properly-registered mosaics of Europa,
http://www.unmannedspaceflight.com/index.php?showtopic=8730&view=findpost&p=258652

Volcanopele worked on the Cassini imaging team so you can bet he knows a thing or two about assembling a mosaic.
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THIS is a large part of why I left NSF many years ago and why I will probably do so again very shortly. Try to be helpful or get people to be balanced about their thinking and you will be roasted for it.


The anti SLS is warranted.   Anything else is better.   It is the SpaceX only fanatical young males are the issue.

And fanatical old taxpayers! I drank the Kool-Aid on Ares I/V (and should've known better). SLS isn't a real improvement and has been ripping us off for years.
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Kathy L is very excited about this, getting ready for Crew5... struck by how we are talking about another use for this capability... our goal for Commercial Crew was to develop LEO capability and ISS visits, we're seeing that other uses are happening... Inspiration 4 was a demonstration of that....

Shout out to everyone working through Ian... it's (one reason) why we do science.. to find ways to notify and help folks avoid hurricanes.
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