 
 
DS1 Spacecraft Orientation CK File for 2001
===========================================================================
 
     Created by Boris Semenov, NAIF/JPL, Tue Sep 30 14:27:14 PDT 2003
 
 
Orientation Data in the File
--------------------------------------------------------
 
     This file contains orientation and angular velocity data for the
     Deep Space 1 (DS1) spacecraft frame, 'DS1_SC_BUS', relative to
     the 'J2000' inertial frame. The NAIF ID code for the 'DS1_SC_BUS'
     frame is -30000.
 
 
Status
--------------------------------------------------------
 
     This file was created by NAIF for archiving with the Planetary Data
     System (PDS) from daily CK files produced by NAIF Team, JPL.
 
 
Pedigree
--------------------------------------------------------
 
     The original CK files used to create this file were officially
     delivered to the DS1 project by the NAIF Team. These files contained
     spacecraft frame orientation relative to the 'J2000' inertial frame.
     The orientation was computed, converted to quaternions and filtered
     on-board; filtered quaternions were transmitted to the Earth in the
     channelized telemetry. On the ground quaternions were extracted from
     telemetry and written to daily CK files using the MSOPCK program. The
     individual daily files were merged together at the time of archiving
     to provide complete coverage on a yearly basis.
 
     A table containing the complete list of original CK files from which
     data were included in this file is provided at the end of these
     comments.
 
 
Approximate Time Coverage
--------------------------------------------------------
 
     This file covers the following interval:
 
          Coverage Begin UTC       Coverage End UTC
          ------------------------ ------------------------
          2001-JAN-01 00:01:01.088 2001-DEC-18 20:51:43.852
 
     This file is a type 3 CK file which provides linear interpolation
     between orientation data points extracted from telemetry. Such
     interpolation is not applied to the whole coverage of the file but
     only inside intervals where enough orientation telemetry data was
     available and orientation data points were close to each other in time
     for such interpolation to make sense.
 
     The nominal quaternion time spacing in the telemetry stream varied
     from a fraction of a second to many seconds between adjacent data
     points. The duration of the longest interval over which
     the data may be interpolated was set to 180 seconds. For all
     requests for data falling between two adjacent data points separated
     by more than 180 seconds the SPICELIB CK readers will return a
     logical flag stating "POINTING NOT FOUND".
 
     A table containing the complete list of valid interpolation intervals
     in the file is provided at the end of these comments.
 
 
Angular Rate Data Note
--------------------------------------------------------
 
     Data records in this file contain actual angular rates computed
     on-board.
 
 
Usage Note
--------------------------------------------------------
 
     In order to use this file an DS1 SCLK file containing coefficients
     mapping DS1 on-board time to ET must be loaded into a user's program.
 
 
Related Kernels
--------------------------------------------------------
 
     This file was created using the following LSK and SCLK files:
 
        naif0007.tls
        ds1_sclkscet_00071.tsc
 
 
Contacts
--------------------------------------------------------
 
     If you have any questions regarding this data contact NAIF at JPL:
 
        Charles H. Acton, Jr
        (818)-354-3869
        chuck.acton@jpl.nasa.gov
 
        Boris V. Semenov
        (818)-354-8136
        boris.semenov@jpl.nasa.gov
 
 
Appendix 1: List of the original CK files
--------------------------------------------------------
 
ds1_sc_ck_2001-01-01.bc
ds1_sc_ck_2001-01-02.bc

(many lines were skipped to reduce the example size)

ds1_sc_ck_2001-12-17.bc
ds1_sc_ck_2001-12-18.bc
 
 
Appendix 2: Interpolation Intervals in the File
--------------------------------------------------------
 
     The information in this section has been generated by running CKBRIEF
     utility program using -dump -utc command line options.
 
 
CKBRIEF Version: 2.0.0, 2001-05-16. SPICE Toolkit Version: N0056.
 
 
Summary for: ds1_sc_2001.bc
 
Segment No.: 1
 
Object:  -30000
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-JAN-01 00:01:01.088 2001-MAR-13 16:01:51.916 Y
  2001-MAR-13 16:05:13.915 2001-MAR-16 04:46:24.784 Y
 
Segment No.: 2
 
Object:  -30000
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-MAR-16 04:46:24.784 2001-MAR-20 00:11:54.587 Y
  2001-MAR-20 00:16:54.587 2001-MAR-20 00:16:54.587 Y

  (many lines were skipped to reduce the example size)

  2001-SEP-28 07:54:28.207 2001-SEP-28 14:52:14.245 Y
  2001-SEP-29 00:00:10.295 2001-DEC-02 16:30:43.740 Y
 
Segment No.: 5
 
Object:  -30000
  Interval Begin UTC       Interval End UTC         AV
  ------------------------ ------------------------ ---
  2001-DEC-02 16:30:43.740 2001-DEC-18 20:51:43.852 Y
 
 
