Tianwen-1 At Mars |
Tianwen-1 At Mars |
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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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#2
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![]() Member ![]() ![]() ![]() Group: Members Posts: 559 Joined: 1-May 06 From: Scotland (Ecosse, Escocia) Member No.: 759 ![]() |
Apollo 12 in 1969 was trying to land close to the dead Surveyor 3 craft, which was located inside a sizeable crater with internal slopes which could not be landed on safely. So the commander asked the navigation team to targeted him directly at Surveyor, on the basis that, due to landing errors, this was the best way to AVOID hitting Surveyor or decending inside its crater! The same rationale might apply here -- aim for the place that you least want to arrive at, in the sure knowledge that actually getting there is extremely ulikely!
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#3
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![]() Member ![]() ![]() ![]() Group: Members Posts: 153 Joined: 8-February 04 From: Phoenix, AZ USA Member No.: 9 ![]() |
Apollo 12 in 1969 was trying to land close to the dead Surveyor 3 craft, which was located inside a sizeable crater with internal slopes which could not be landed on safely. So the commander asked the navigation team to targeted him directly at Surveyor, on the basis that, due to landing errors, this was the best way to AVOID hitting Surveyor or decending inside its crater! The same rationale might apply here -- aim for the place that you least want to arrive at, in the sure knowledge that actually getting there is extremely ulikely! This phenomena played a role in the plot of the novel Gravity’s Rainbow by Thomas Pynchon, wherein the German V-2 engineers would observe the impacts of ballistic rocket tests from the center of the targeted bullseye. -------------------- Tim Demko
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