More bad news

[Akarsh Simha]

https://www.livescience.com/space/space-exploration/chinas-secretive-new-thousands-sails-satellites-are-an-astronomers-nightmare-1st-observations-reveal

BTW, Scott Harrington is one of the co-authors of the research paper.

[Alan Agrawal]

Wow, the beginning of the end of deep sky observing.  Its all so sad…

Alan

On Oct 14, 2024, at 11:26 AM, Akarsh Simha <akars...@gmail.com> wrote:



https://www.livescience.com/space/space-exploration/chinas-secretive-new-thousands-sails-satellites-are-an-astronomers-nightmare-1st-observations-reveal

BTW, Scott Harrington is one of the co-authors of the research paper.

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[Rahul Sangole]

Heart breaking :( 

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[Ted Hauter]

Solar fans Unite!

Psychopaths running amock.

But remember that sea harvester for sea trash? We will need a big net like that. Make it red white and blue.

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[Richard Ozer]

It'll be a new challenge.  Find all 15,000.  I hear that the AL will have a very reflective pin.

On Mon, Oct 14, 2024 at 11:26 AM Akarsh Simha <akars...@gmail.com> wrote:

https://www.livescience.com/space/space-exploration/chinas-secretive-new-thousands-sails-satellites-are-an-astronomers-nightmare-1st-observations-reveal

BTW, Scott Harrington is one of the co-authors of the research paper.

--

[Ted Hauter]

🤭😂

To view this discussion on the web visit https://groups.google.com/d/msgid/sf-bay-tac/CAEgXk-mv8ZBL47OAY4jpX5V%2BLeC%3DrV_oZnJNzFqYE6x_jAe4hg%40mail.gmail.com.

[Akarsh Simha]

https://arstechnica.com/science/2024/11/nro-chief-you-cant-hide-from-our-new-swarm-of-spacex-built-spy-satellites/

Apparently now the defense

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[Vishal Kasliwal]

Those get colored black for a reason! 

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[Akarsh Simha]

On Wed, Nov 13, 2024 at 5:00 PM Vishal Kasliwal <vishal....@gmail.com> wrote:

Those get colored black for a reason! 

I hope they work hard to make them invisible! But my understanding is that the database of satellite orbits is public, including military ones. It's only their payloads and capabilities that are covert afaik.

Regards

Akarsh

 

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[Vishal Kasliwal]

Spy satellites have to change orbit to be able to see stuff that is at a significant angle otherwise. Looking anything other than straight down carries penalities with the penalties increasing as you look further off-angle. Spy satellites don't have fixed orbits... 

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[John Pierce]

anything other than a very minor orbital change requires a lot of thruster mass, limiting how many times a given satellite can 'move' 

To view this discussion visit https://groups.google.com/d/msgid/sf-bay-tac/CANZYFeFoKOvSYJBKHHn%2BSyE1M9%2B0_HYVxe63Hp7mWtc_ELsJuQ%40mail.gmail.com.

[Vishal Kasliwal]

Yup, probably one of the reasons why the U2 still flies to this date. It's an optimization problem - given all the existing spy satellites, find the satellite that requires the least delta-E to conduct the mission given a prescribed level of data-quality and compare that to what the U2 can deliver safely to decide which option to use given that the satellite has a finite lifetime delta-E. 

To view this discussion visit https://groups.google.com/d/msgid/sf-bay-tac/CAJnkzX%2BLBXpL94SgN5L9oDn9JPj9iP4Rda%2BB2fPWupko24FW3Q%40mail.gmail.com.