InSight Cruise Phase, Events during Mars transit prior to EDL |
InSight Cruise Phase, Events during Mars transit prior to EDL |
May 8 2018, 05:35 AM
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Merciless Robot Group: Admin Posts: 8785 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Hey again, everyone. This thread will be for discussion of anything that happens between now & landing day, currently 26 Nov US Pacific time (UTC-8 hrs during that part of the year).
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Nov 16 2018, 04:09 PM
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Senior Member Group: Members Posts: 2542 Joined: 13-September 05 Member No.: 497 |
There are SPICE predict files at https://naif.jpl.nasa.gov/pub/naif/INSIGHT/kernels/ but I don't know how well they model the final descent.
The raw IMU data from Phoenix including angles and rates is at https://atmos.nmsu.edu/pub/PDS4/Version_1.1...ndle_1100/data/ but it's quite difficult to do anything with the raw data. -------------------- Disclaimer: This post is based on public information only. Any opinions are my own.
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Guest_mcmcmc_* |
Nov 17 2018, 09:59 AM
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Guests |
The raw IMU data from Phoenix including angles and rates is at https://atmos.nmsu.edu/pub/PDS4/Version_1.1...ndle_1100/data/ but it's quite difficult to do anything with the raw data. Thanks, they're the same data I found. In theory they are clearly explained in .LBL files, but actually I am a little in trouble because PHXPROFILES.TAB (54 MB), which should contain whole EDL data, ends with: 2316.9030 0.0000 3.3774E+06 1.4861E+03 ( ....) 8.1841E+01 3.6288E+00 -4.4009E+01 3.5347E+00 3.1595E+00 5.2946E+00 Which should mean, by its LBL file: *2316 seconds elapsed since reference time "2008-05-25T23:00:00.000" (defined in DATASET.CAT) *Radial distance from Mars center of mass: 3377.4 km, sigma 1.486m *SpeedX = 81 m/s, sigma 4.6 m/s *SpeedY = -44 m/s, sigma 3.5 m/s *SpeedZ = 3 m/s, sigma 5.2 m/s (distance of landing site from Mars center: 3376.3 km) Ok for altidue and SpeedZ... but 81 m/s horizontal speed at landing??? Last line has a timestamp = 2316.9030, which is 459 seconds after first timestamp (1857,733), and 459 seconds are a duration compatible with EDL duration... but why those nonsens X and Y speeds? Figure 1-7 in this study says (of course) a different story: 0.1 m/s horizontal speed, but I can't find it in the data. PHXCOMPACT.TAB has no speed data, only altitude and atmospheric data at 1km interval: Radial distance (m) MRADIAL_DISTANCE sigma Altitude (km) MALTITUDE sigma Density (kg m^(-3)) MRHO sigma Pressure (Pa) MPRESS sigma Temperature (K) MTEMP sigma |
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