Mro On Approach, TCM-3 not required |
Mro On Approach, TCM-3 not required |
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#1
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![]() Member ![]() ![]() ![]() Group: Members Posts: 134 Joined: 13-March 05 Member No.: 191 ![]() |
MRO has shifted from the cruise phase to Approach phase. Apparently, the trajectory is so good that TCM-3 was cancelled. This is good news for the prospects for a long life for MRO supporting future missions. TCM-4 is on Feb 28, and MOI on March 10. Only 5 weeks away!
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#2
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Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
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#3
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 ![]() |
Given the addition of some post-moi-pre-aerobraking imaging, at what appears to be between about 0000 and 0600 on the 15th of March - any idea on a nadir target for that sort of time? Doug Looks like it's the north polar ice cap. Here's the view midway in that interval (+ marks the nadir point): ![]() Note that the FOV above is 5 degrees. CTX has an FOV 0f 6 degrees; HiRISE 1.14 degrees. -------------------- |
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#4
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 ![]() |
Looks like it's the north polar ice cap. Here's the view midway in that interval (+ marks the nadir point): Try looking (hint, hint) closer to 6:00 UTC. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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#5
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 ![]() |
Try looking (hint, hint) closer to 6:00 UTC. Hmmm... here is the view at 0600: ![]() Wondering what you are hinting at--perhaps this is targeted after one of the proposed Phoenix landing sites? The subpoint above is 75N 141W. -------------------- |
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#6
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 ![]() |
Wondering what you are hinting at--perhaps this is targeted after one of the proposed Phoenix landing sites? The subpoint above is 75N 141W. I think your software is confused, or ours is. What SPICE kernel are you using? -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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#7
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 ![]() |
I think your software is confused, or ours is. What SPICE kernel are you using? Could be. Here are the kernels I'm using: CK: '$KROOT/ck/DESAT_MOI_sc_20060103171803.bc', SPK: '$KROOT/spk/spk_c_tcm1-od006_050812_060315_p-v1.bsp', '$KROOT/spk/spk_moi_lowperf_t2_051123_060320_p-v1.bsp', '$KROOT/spk/spk_moi_ideal_051123_060320_p-v1.bsp', '$KROOT/spk/spk_moi_highperf_t1_051123_060320_p-v1.bsp', I notice there's a big difference whether highperf, ideal or lowperf is used, so maybe that's the difference. The projection above uses highperf (since it's the last listed in the config file). -------------------- |
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#8
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2517 Joined: 13-September 05 Member No.: 497 ![]() |
I notice there's a big difference whether highperf, ideal or lowperf is used, so maybe that's the difference. The projection above uses highperf (since it's the last listed in the config file). We were doing this planning several weeks ago, so the kernel I used was from mid-January. In those kernels, we were near periapsis at 6:00 UTC. Looks like we're looking at some replanning if the MOI performance makes this much difference. I would try rerunning with ideal and see what that looks like. BTW, what software are you using for this? -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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