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: 8784 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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Guest_mcmcmc_* |
Nov 7 2018, 07:07 PM
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Guests |
Insight will have same EDL profile of Phoenix, so while we wait for november 26th we can imagine how it will be: this video mixes real mission control audio+video with video simulation to show what happened 10 years ago and what will happen 3 weeks from now:
https://www.youtube.com/watch?v=hH5pNFROlYU Note: for some reasons, the "freefall phase" after parachute jettisoning is not called like that for Insight, but instead called "gravity turn"; then engines are started ("Powered descent phase"), and after 3 seconds of freefall+deceleration Insight will enter the "Constant velocity phase"; once Insight slows down to 30 km/h (around 50m from ground) it turns on ground contact sensors on legs; at 8 km/h engines are turned off, to prevent too much regolite from being blown around, and a final free-fall (few centimeters) starts, and we are on Mars. This document analyses actual Phoenix EDL recorded data: https://ntrs.nasa.gov/archive/nasa/casi.ntr...20080034645.pdf Reconstructed Insight timeline (from multiple inconsistent sources): Text version: CODE n t alt m v m/s v mph v kmh Event 1 -420 cruise stage detachment 2 -390 Entry turn starts 3 -300 Entry turns end 4 0 128000 75301 13000 17017 atmosphere entry 5 100 7.4g 6 223 12000 415 928 1494 Parachute 7 238 10300 132 295 475.2 heat shield jettisoned 8 248.0 leg1 9 248.5 leg2 10 249.0 leg3 11 249.5 legs ready 12 300 5500 Radar on 13 333 2300 Radar acquires ground 14 351 1100 61 136 220 Parachute/Lander separation 15 354 900 Gravity turn start (free fall) 16 378 51 8 17 28 Constant velocity start (powered descent) 17 393.75 2.2 5 8 Engine off 18 394 0 0 0 0 Touchdown Status monitor: http://win98.altervista.org/space/exploration/ Phoenix EDL analysis: Sources: https://www.seis-insight.eu/en/public-2/the...mission/landing https://mars.nasa.gov/insight/timeline/land...escent-landing/ https://www.jpl.nasa.gov/news/press_kits/in...ion/Layer-2.jpg |
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