Chinese satellite in wrong orbit

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kopius
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Chinese satellite in wrong orbit

Postby kopius » Tue Jun 20, 2017 11:16 pm

Whoops...

Ground controllers could try to salvage a Chinese television broadcasting satellite deployed in a lower-than-planned orbit Sunday by a Long March 3B rocket.

A brief statement from the China Aerospace Science and Technology Corp., a state-run contractor for China’s space program, confirmed an anomaly in the Long March 3B rocket’s third stage left the Chinasat 9A communications satellite in the wrong orbit following a liftoff from the Xichang space center...

https://spaceflightnow.com/2017/06/19/c ... t-failure/
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Re: Chinese satellite in wrong orbit

Postby SpaceManMat » Wed Jun 21, 2017 9:28 am

Short and in the wrong inclination. Sounds like someone stuffed the coordinates.
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Re: Chinese satellite in wrong orbit

Postby OverTheTop » Wed Jun 21, 2017 12:12 pm

Stage 3 anomaly I believe.

Short and in the wrong inclination. Sounds like someone stuffed the coordinates.

Not likely. Too short burn on S3 would have the required effect. Inclination can be corrected (and indeed normally needs to be as most GEO satellites are not launched from the equator) by an additional delta-V, of typically 1-2 km/s.
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Re: Chinese satellite in wrong orbit

Postby SpaceManMat » Wed Jun 21, 2017 5:12 pm

OverTheTop wrote:Stage 3 anomaly I believe.

Short and in the wrong inclination. Sounds like someone stuffed the coordinates.

Not likely. Too short burn on S3 would have the required effect. Inclination can be corrected (and indeed normally needs to be as most GEO satellites are not launched from the equator) by an additional delta-V, of typically 1-2 km/s.


I need to brush up on GEO orbits, makes sense but I had thought changes in inclination are difficult. Although thinking about it at apogee in a highly elliptical orbit the velocity will be relatively small so a burn at the right angle should be able to alter the inclination relatively easy. Just need apogee to line up over the equator.
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