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Tianwen-1 At Mars
Greenish
post Feb 8 2021, 03:04 PM
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For those who haven't already seen, there is excellent work independently tracking and predicting the trajectory of Tianwen-1 by radio amateurs (using that word only technically, since they are very much pros).
The latest is predicting orbital insertion at 8 seconds before 1200 UTC on Wednesday 10 February, with a 386 km periapsis - burn starts a few minutes before that if you, like me, are planning your peanut consumption carefully this week.

Plenty of details to be found at these links (even a GMAT script and Jupyter notebook, and some doppler data, for the astrodynamically inclined).
https://destevez.net/tag/tianwen/
Daniel Estévez recent twitter thread with MOI images
Scott Tilley recent twitter thread
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Huguet
post Feb 10 2021, 01:26 PM
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Daniel Estévez (Twitter)
@ea4gpz
"Acqusition of signal confirmed in @SternwarteBO shortly after 12:48 UTC. The spacecraft is still using the low gain antenna."

https://twitter.com/ea4gpz/status/1359484672456196097
https://spacenews.com/chinas-tianwen-1-ente...it-around-mars/

Tianwen-1 in orbit of Mars,... we should receive some photo,.. some time... i think...

...anxious to see some of the best then 50cm resolution images it will take in the near future...
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Greenish
post Feb 10 2021, 01:38 PM
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Orbital insertion confirmed. CASC says landing attempt May-June timeframe now, per Andrew Jones of SpaceNews.
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MERovingian
post Feb 10 2021, 02:05 PM
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And another one! Mars is a spoiled planet! smile.gif What a great couple of days it has been!

Congrats to the Chinese space agency, 6th to the red planet!
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Huguet
post Feb 10 2021, 04:27 PM
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Interesting is the enormous numbers of firsts for the chinese in this mission,.. and the number of technologies they are using that are well tested on the chang's missions.

1 - Arriving Mars
2 - Orbiting Mars
3 - Mars close approach and High Resolution Image Mapping
4 - Mars Landing
5 - Mars Rover

The only achievment that will not be reached is Mars Return and Taikonauts to Mars.... and the first one they already proved at 1.6m/s2 moon gravity... big step to prove on mars 3.7m/s2 gravity... the second task,.. well, lets wait till they make it on Moon...


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nprev
post Feb 10 2021, 04:45 PM
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This will be the general thread for orbital operations. A new thread will be established for landing and surface activities once those occur.


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Huguet
post Feb 11 2021, 09:52 AM
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"At ~13:14:20 UTC #Tianwen-1 switched from Low Gain Antenna (LGA) to High Gain Antenna (HGA) and already started to send some high speed data back to the CSNA Groundstations."
Anyone to decode that?...
@AMSATDL AMSAT-DL ON TIANWEN-1
https://twitter.com/amsatdl/status/1359643118782578690

21 May predicted date to land on Mars:
@PRCMarsRover
https://twitter.com/PRCMarsRover/status/1359834987277684740
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Steve G
post Feb 11 2021, 12:58 PM
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Hopefully, they might be able to get a peek at neglected Deimos.
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neo56
post Feb 12 2021, 11:10 AM
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Amazing video taken by one of Tianwen-1 camera during orbital insertion.

Another one.


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Huguet
post Feb 12 2021, 12:21 PM
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Congrats CASC,... continue sending every raw footage or data yu receive from Tianwen-1, never too much... I have worked with the Yutu-2 Data and must say that if we got the same from Tianwen-1 it will be stupendous...


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neo56
post Feb 12 2021, 09:27 PM
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I did some quick image processing on screenshots of Tianwen-1 video of Mars orbit insertion to enhance surface features.









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Antdoghalo
post Feb 12 2021, 10:30 PM
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Congrats to the Chinese for being number 6 to enter orbit!!!
Looks like it photographed Albor Tholus and Elysium Chasma.


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Huguet
post Feb 12 2021, 11:07 PM
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Wonderfull views of Mars overlapped by tianwen-1, one idea, CASC should release another drop cam to get a far image of Tianwen-1 with Mars at the background...


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rlorenz
post Feb 12 2021, 11:53 PM
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QUOTE (neo56 @ Feb 12 2021, 06:10 AM) *



Very cool !

I'm surprised at the amount of foreground movement in the solar array movie (circa 45s). Not quite sure what is going on - array flexing? And if it is a structural oscillation or some controlled movement (gimballing of something, it almost looks like something is stepping or limit-cycling)
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fredk
post Feb 13 2021, 12:22 AM
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I couldn't see anywhere by what factor those clips are sped up...
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