Tianwen-1 At Mars |
Tianwen-1 At Mars |
Feb 8 2021, 03:04 PM
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#1
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Member Group: Members Posts: 219 Joined: 14-November 11 From: Washington, DC Member No.: 6237 |
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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May 12 2021, 10:33 AM
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#2
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Member Group: Members Posts: 185 Joined: 4-January 19 Member No.: 8523 |
Indeed not less than 200km at periapsis. Timing for Zhurong to start its landing maneuver, in UTC, by Edgar Kaiser, based on the orbiter periapsis and time over the landing guessed coordinates on Utopia Planitia:
Mars in sight over China 2021.05.10 20:33:02 SKIPPED 2021.05.12 21:47:53 SKIPPED Mars off sight over China 2021.05.14 23:02:44 DATE OF LANDING, BY SOURCE QUOTING CAST (by Cosmic_Penguin) 2021.05.17 00:17:35 2021.05.19 01:32:26 Mars in sight over China 2021.05.21 02:47:17 In sight with Jiamusi Antenna: https://en.wikipedia.org/wiki/Chinese_Deep_Space_Network 2021.05.23 04:02:08 2021.05.25 05:16:59 Last periapsis on May: 27/05/2021 06:31 29/05/2021 07:46 Date of Landing, by a source quoting CAST: https://twitter.com/Cosmic_Penguin/status/1...701561030123521 More from Edgar Kaiser, that sugests we could have an atempt at today window: "Tianwen-1 showed quite some ground station activity along yesterday's approach to apoapsis. Tonight, at 21:47:53 UTC it will pass periapsis again." Based on Mars position in the sky on the periapsis dates, chinese would have best comunication with the Tianwe-1 only today, bad sight on 14, 17 and 19th, so it apears that today could be the last window till may 21th. https://twitter.com/df2mz/status/1392384013986410504 Orbital Period is 49h 14m 51s https://twitter.com/df2mz/status/1391876766294331395 Good Thread following the landing from kaynouky https://twitter.com/Kaynouky/status/1392051005664239619 -------------------- "The Earth is a very small stage in a vast cosmic arena"
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