Dawn Vesta Mission Trajectory SPK, JPL SSD Solution
===========================================================================
 
     Created by Boris Semenov, NAIF/JPL on October 29, 2013, using
     trajectory data provided by Alex Konopliv, SSD/JPL on October 17,
     2013.
 
 
Objects in the Ephemeris
--------------------------------------------------------
 
     This file contains trajectory data for the Dawn spacecraft. The
     NAIF ID code for Dawn is -203.
 
 
Approximate Time Coverage
--------------------------------------------------------
 
     This file covers the following time intervals:
 
        COVERAGE BEGIN TIME (TDB)   COVERAGE END TIME (TDB)
        -------------------------  ------------------------
        2011 JUL 13 02:30:00.000   2011 JUL 28 13:00:00.000
        2011 AUG 02 07:30:00.000   2011 AUG 31 22:15:00.000
        2011 SEP 28 10:00:00.000   2011 NOV 02 11:14:00.000
        2011 NOV 17 15:00:00.000   2011 NOV 20 04:00:00.000
        2011 NOV 20 07:00:00.000   2011 NOV 23 23:00:00.000
        2011 NOV 25 01:00:00.000   2011 NOV 27 22:00:00.000
        2011 DEC 04 05:10:00.000   2011 DEC 10 09:00:00.000
        2011 DEC 12 16:00:00.000   2011 DEC 17 09:00:00.000
        2011 DEC 17 10:40:00.000   2011 DEC 24 20:20:00.000
        2011 DEC 24 21:45:00.000   2012 JAN 14 06:40:00.000
        2012 JAN 17 22:00:00.000   2012 JAN 28 12:00:00.000
        2012 JAN 28 15:40:00.000   2012 FEB 04 18:00:00.000
        2012 FEB 04 21:00:00.000   2012 FEB 22 04:00:00.000
        2012 FEB 23 10:00:00.000   2012 MAR 10 09:00:00.000
        2012 MAR 10 18:05:00.000   2012 MAR 17 15:40:00.000
        2012 MAR 17 18:00:00.000   2012 MAR 24 07:30:00.000
        2012 MAR 24 09:10:00.000   2012 MAR 31 15:30:00.000
        2012 MAR 31 16:40:00.000   2012 APR 21 14:00:00.000
        2012 APR 21 16:00:00.000   2012 APR 27 17:00:00.000
        2012 APR 27 19:00:00.000   2012 APR 30 12:00:00.000
        2012 JUN 06 06:00:00.000   2012 JUL 25 09:00:00.000
 
 
Pedigree
--------------------------------------------------------
 
     This SPK file contains Dawn trajectory reconstruction provided by
     Alex Konopliv and Ryan Park of the Solar System Dynamics Group
     (SSD), JPL.
 
     The Dawn orbits in this file were generated as part of the Vesta
     gravity field and related physical parameters determination work
     described in

        Konopliv, A.S., et al., The Vesta gravity field, spin pole 
        and rotation period, landmark positions, and ephemeris from 
        the Dawn tracking and optical data. Icarus (2013), 
        http://dx.doi.org/10.1016/j.icarus.2013.09.005

     The file does not provide complete coverage for the whole Dawn
     Vesta mission because no orbit determination was done during orbit
     transfer thrusting periods, orbit trim maneuvers, and safe modes.
     The complete list of the periods (arcs) for which the fit was done
     and notes regarding orbit trip maneuvers (OTMs) and safe modes are
     provided in Appendix 1 below.

 
Contacts
--------------------------------------------------------
 
     If you have any questions regarding this data contact
 
        Alex Konopliv, SSD/JPL
        Alexander.S.Konopliv@jpl.nasa.gov
 
        Ryan Park, SSD/JPL
        Ryan.S.Park@jpl.nasa.gov

     or:
 
        Boris Semenov, NAIF/JPL,
        Boris.Semenov@jpl.nasa.gov
 
 
Appendix 1: Summary of Arcs in the Dawn SSD Trajectory Set
===========================================================================
 
     # Survey:
     ARC002  13-JUL-2011 02:30:00 TO 23-JUL-2011 05:30:00
     ARC004  23-JUL-2011 05:30:00 TO 28-JUL-2011 13:00:00
     ARC005  01-AUG-2011 31:30:00 TO 31-AUG-2011 22:15:00

     # HAMO:
     ARC001  27-SEP-2011 34:00:00 TO 02-NOV-2011 11:14:00

     # Pre-LAMO, LAMO:
     # OTMS on Nov 20, 23, 28, Dec 4, 10, 12, 17, 24
     # OTMS on Jan 28, Feb 4, Mar 10, 17, 24, 31, Apr 21, 27
     ARC002  17-NOV-2011 15:00:00 TO 20-NOV-2011 04:00:00
     ARC004  20-NOV-2011 07:00:00 TO 23-NOV-2011 23:00:00
     ARC006  25-NOV-2011 01:00:00 TO 26-NOV-2011 12:00:00
     ARC007  26-NOV-2011 12:00:00 TO 27-NOV-2011 22:00:00
     ARC009  04-DEC-2011 05:10:00 TO 10-DEC-2011 09:00:00
     ARC010  12-DEC-2011 16:00:00 TO 17-DEC-2011 09:00:00
     ARC012  17-DEC-2011 10:40:00 TO 24-DEC-2011 20:20:00
     ARC014  24-DEC-2011 21:45:00 TO 14-JAN-2012 12:00:00
     # Entered safemode Sat Jan 14 06:49 to Tues Jan 17.
     ARC020  17-JAN-2012 22:00:00 TO 28-JAN-2012 12:00:00
     ARC022  28-JAN-2012 15:40:00 TO 04-FEB-2012 18:00:00
     ARC024  04-FEB-2012 21:00:00 TO 22-FEB-2012 04:00:00
     # Entered safemode Feb 22 03:13
     ARC030  23-FEB-2012 10:00:00 TO 10-MAR-2012 09:00:00
     ARC034  10-MAR-2012 18:05:00 TO 17-MAR-2012 15:40:00
     ARC036  17-MAR-2012 18:00:00 TO 24-MAR-2012 07:30:00
     ARC038  24-MAR-2012 09:10:00 TO 31-MAR-2012 15:30:00
     ARC040  31-MAR-2012 16:40:00 TO 21-APR-2012 14:00:00
     ARC042  21-APR-2012 16:00:00 TO 27-APR-2012 17:00:00
     ARC044  27-APR-2012 19:00:00 TO 01-MAY-2012 12:00:00

     # HAMO-2
     ARC004  06-JUN-2012 06:00:00 TO 01-JUL-2012 06:00:00
     ARC006  01-JUL-2012 06:00:00 TO 25-JUL-2012 15:00:00


End of comments.