INSIGHT Reconstructed EDL SPK file, INSIGHT EDL Team Solution
===========================================================================
 
   Created in March 2019 by Mark Johnson, INSIGHT EDL Team/LMCO;
   coverage shortened and comments added on May 2, 2019 by Boris
   Semenov, NAIF/JPL.
 
 
Objects in the Ephemeris
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   This file contains the reconstructed Entry Descent Landing
   (EDL) trajectory of INSIGHT. The NAIF ID code for INSIGHT is -189.
 
 
Approximate Time Coverage
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   This file covers the whole EDL of the INSIGHT mission:
 
      COVERAGE BEGIN TIME (ET):      2018 NOV 26 19:40:12.182
      COVERAGE END TIME (ET):        2018 NOV 26 19:46:02.182
 
 
Status
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   This file was prepared for archiving in the Planetary Data System
   (PDS).
 
 
Pedigree
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   This file represents the reconstructed trajectory of the INSIGHT
   spacecraft during its descent to Mars on Nov 26 2018. The data in
   the original SPK file named ``InSight_high_rate_bkwd_extended.bsp''
   spanned the period from approximately 10 min before atmospheric
   entry interface to approximately two hours after touchdown. In
   preparation for the archive the coverage of the file was shortened
   to start at the EDL interface time and to end at touchdown, overlapping
   the cruise and surface position SPKs by a fraction of a second.
 
   The EDL trajectory data presented in this SPK is a result of
   backwards-propagating the trajectory from the observed landing
   location using the 200 Hz acceleration and rate data from the IMU.
   The high-rate data was available only after Entry Interface (E),
   thus data in the period from E-10 min to E, most of which was not
   copied to this file, was generated by backwards propagating from
   this earliest point using Systems ToolKit (STK) v11.2, utilizing a
   RK7-8 integrator with a 25x25 subset of the MRO_110-C gravity field,
   spherical solar radiation pressure, and Sun gravity as a perturbing
   force. While the source data was provided and trajectory
   determination was done in the Mars-centered, Mars Mean Equator, IAU
   node of J2000 inertial frame, the data stored in this SPK is in
   the Earth Mean Equator and Equinox of J2000 (the SPICE J2000 frame).
 
   The raw IMU data was processed by Tom Kennedy, LMCO
   (thomas.kennedy@lmco.com). The processed data was integrated into a
   full trajectory reconstruction by Gene Bonfiglio, JPL
   (eugene.bonfiglio@jpl.nasa.gov) and Brooke Harper, JPL
   (brooke.harper@jpl.nasa.gov). Additional propagation using STK and
   generation of this BSP file was performed by Mark Johnson, LMCO
   (mark.z.johnson@lmco.com).
 
 
Usage
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   This file should be used together with DE430 planetary ephemeris and
   MAR097 satellite ephemeris.
 
 
Contacts
--------------------------------------------------------
 
   If you have questions regarding this data contact INSIGHT EDL Team:
 
      Mark A. Johnson
      (303)-971-2169
      Mark.Z.Johnson@lmco.com
 
   or NAIF:
 
      Boris Semenov
      (818)-354-8136,
      Boris.Semenov@jpl.nasa.gov
 
 
 
Appendix 1: SPKMERGE Log
--------------------------------------------------------
 
 
; insight_edl_rec_v1.bsp LOG FILE
 
; Created 2019-05-02/11:27:48.00.
;
; BEGIN SPKMERGE COMMANDS
 
LEAPSECONDS_KERNEL   = /ftp/pub/naif/INSIGHT/kernels/lsk/naif0012.tls
 
SPK_KERNEL           = insight_edl_rec_v1.bsp
  SOURCE_SPK_KERNEL  = InSight_high_rate_bkwd_extended.bsp
    INCLUDE_COMMENTS = NO
    BODIES           = -189
    BEGIN_TIME       = 2018 NOV 26 19:39:03.000
    END_TIME         = 2018 NOV 26 19:44:53.000
 
; END SPKMERGE COMMANDS
 
 
End of comments.