Entry, Descent, and Landing data |
Entry, Descent, and Landing data |
Jun 1 2011, 10:59 PM
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Junior Member Group: Members Posts: 89 Joined: 27-August 05 From: Eccentric Mars orbit Member No.: 477 |
Poking through the files at JPL NAIF, I found a couple of kernels for MSL. One is labeled cruise, and one is labeled EDL. Now since there is no target set yet, these are obviously preliminary, but they are still interesting for just seeing what EDL is like. this is the comment section of the EDL kernel:
QUOTE MSL Sample EDL Trajectory SPK File (Central Landing Site (0.0 N, 45.0 E) =========================================================================== Created by Fernando Abilleira, MSL MD/NAV. Comments added by Boris Semenov, NAIF/JPL on Tue Feb 23 16:34:24 PST 2010. Objects in the Ephemeris -------------------------------------------------------- This file contains sample MSL (NAIF ID -76) EDL trajectory, from atmospheric entry interface point to landing, for Type 1B, open of launch period (11/25/2011), optimal launch time, central landing site (0.0 N, 45.0 E), landing time 06-AUG-2012 11:35:46.7 UTC. THIS FILE SHOULD BE USED FOR TESTING PURPOSES ONLY. Approximate Time Coverage -------------------------------------------------------- This file coverage is: COVERAGE BEGIN TIME (TDB) COVERAGE END TIME (TDB) ------------------------- ------------------------ 2012 AUG 06 11:30:58.537 2012 AUG 06 11:36:52.837 Pedigree -------------------------------------------------------- This file was provided by Fernando Abilleira, MSL MD/NAV on February 23, 2010. The original name of this file was 'day1_0.edlTraj.bsp'. Contacts -------------------------------------------------------- If you have any questions regarding this data contact Boris V. Semenov, NAIF/JPL, (818)-354-8136, Boris.Semenov@jpl.nasa.gov This particular kernel is just a list of positions and velocities at specific times, typically 0.1s apart. The attached CSV is a dump of the kernel at those times, plus some bonus stuff you can read about in the file. And here it is: msl_edl.txt ( 566.51K ) Number of downloads: 1128 (Why can't I upload a CSV? Rename this to msl_edl.csv when you get it) A couple of comments: 12 earth g's on entry! Phoenix peaked at 8. It flies for a long time, starting to gain altitude at about 110s and not opening the chute until 250s Of course I'll make an animation at some point, but I am actually more interested in this for analysis and backing out the aerodynamics model, so I can put it as a flyable model for Orbiter. |
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Jan 13 2012, 07:43 PM
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Well, given the fact that further TCMs are probably all but unavoidable for fine targeting I would say that no, the clocks are not accurate to the second at this time. I'm sure that they will be reset once all the maneuvers are completed.
Great to hear that they're gonna try to catch MSL's descent. The shot of Phoenix with chute open from HiRISE was both breathtaking and iconic! -------------------- 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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