Author Topic: Queqiao (Chang‘e-4 coms relay sat) - CZ-4C - XSLC - May 20, 2018 (21:28 UTC)  (Read 30843 times)

Offline Svetoslav

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Offline SciNews

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Queqiao entered the planned halo orbit around the second Lagrangian (L2) point of the Earth-Moon system on 14 June 2018, at 03:06 UTC (11:06 Beijing time).
« Last Edit: 06/14/2018 05:53 PM by SciNews »

Offline Sizzy

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Earth Image , taken by Longjiang small satellite near the backside of moon
June 8th 2018 13:29 UTC+8
« Last Edit: 06/15/2018 02:16 AM by Sizzy »

Offline SciNews

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images taken by Longjiang-2 with an optical camera developed by the King Abdulaziz City for Science and Technology of Saudi Arabia

Offline wahaha

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https://gbtimes.com/radio-enthusiasts-receive-new-earth-and-moon-images-from-chinese-microsatellite-in-lunar-orbit

Radio enthusiasts managed to connect with and download images captured by a tiny satellite in lunar orbit over the weekend and were rewarded with images of the Moon and Earth.

Offline eeergo

https://www.defenseone.com/technology/2018/10/chinas-moon-missions-could-threaten-us-satellites-pentagon/152084/

Sad reminder of what some people are paid and encouraged to think (=be paranoid) about - or why we can't have nice things.
-DaviD-

Offline zubenelgenubi

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https://www.defenseone.com/technology/2018/10/chinas-moon-missions-could-threaten-us-satellites-pentagon/152084/

Sad reminder of what some people are paid and encouraged to think (=be paranoid) about - or why we can't have nice things.

Jim Oberg's Omni article from 1984 was the first I'd heard of this attack scenario:
PEARL HARBOR IN SPACE, James Oberg, OMNI Magazine, July 1984, Page 42-44ff
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Online Steven Pietrobon

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Delta-V from LEO to to EML-2 is 3.43 km/s and EML-2 to GEO is 1.47 km/s, for a total of 4.9 km/s. Or, I could park my stealthy machine gun equipped death satellite in orbit above GEO for a delta-V of 4.3 km/s. When I want to attack, I lower the death satellite to below perigee and start blasting away! That's a lot faster than travelling from EML-2. The guy is obviously not paranoid enough. :-)
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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