PDS_VERSION_ID                   = PDS3
RECORD_TYPE                      = STREAM

OBJECT                           = DATA_SET
DATA_SET_ID                      = "LP-L-ENG-6-SUNPULSE-V1.0"

OBJECT                           = DATA_SET_INFORMATION
DATA_SET_NAME                    = "LP MOON SUN PULSE DATA V1.0"
START_TIME                       = 1998-01-05
STOP_TIME                        = UNK
DATA_OBJECT_TYPE                 = "TABLE"
DATA_SET_RELEASE_DATE            = 1998-06-01
PRODUCER_FULL_NAME               = "ALAN B. BINDER"
DETAILED_CATALOG_FLAG            = "N"
DATA_SET_COLLECTION_MEMBER_FLG   = "N"
DATA_SET_DESC                    = "

Data Set Overview
=================

The sun pulse data set is a record of times that the Lunar Prospector
sun sensor detects the Sun.  These sun pulse times are derived from
ground processing of the sun sensor data, earth-moon limb sensor data,
and the spacecraft ephemeris.  This data set is part of the Lunar
Prospector Level 0 data archive.  The sun pulse times are used in
determining the spacecraft spin rate and orientation as a function of
time.  Because the Lunar Prospector spacecraft is sometimes in eclipse
with the Sun, the sun pulse data set is generated on the ground to
include both actual sun pulse times based on the sun sensor
measurements and estimated sun pulse times based on the history of
spin rate change during all prior eclipses.  See the
CONFIDENCE_LEVEL_NOTE field for further information on how sun pulse
time is estimated during eclipses.

The sun pulse data set is organized into files, each of which cover
about 4-6 hours of time.  In general, each sun pulse file matches the
time range of a corresponding merged telemetry file.  There is usually
one sun pulse record for every other minor frame of the merged
telemetry file.

Science Objectives
==================

The Lunar Prospector science objectives relevant to this data set are
to map the Moon's surface composition and its magnetic field, and to
determine the frequency and location of gas release events.  A special
emphasis of the science objectives is to search for polar water ice
deposits [BINDERETAL1998]. "
 
CONFIDENCE_LEVEL_NOTE           = "
 
Confidence Level Overview
=========================

When Lunar Prospector is in sunlight, the sun pulse time is set equal
to the sun sensor time extracted from the telemetry files.  When the
spacecraft is in eclipse, the sun pulse is estimated using the
pre-eclipse measured spin rate, the calibrated spin rate change during
eclipse, and limb sensor telemetry.  The uncertainty in an estimated
sun pulse time is also determined and stored in the data set.  Each
sun pulse record contains a flag indicating whether the value is an
actual or estimated value.

Data Coverage and Quality
=========================

Sun sensor data are acquired continuously by Lunar Prospector.
However, gaps can occur in the telemetry data.  The times of these
gaps are documented in a log file included with the level 0 archive. "
 
END_OBJECT                       = DATA_SET_INFORMATION
 
 OBJECT                           = DATA_SET_TARGET
 TARGET_NAME                      = MOON
 END_OBJECT                       = DATA_SET_TARGET
 
 OBJECT                           = DATA_SET_HOST
 INSTRUMENT_HOST_ID               = LP
 INSTRUMENT_ID                    = ENG
 END_OBJECT                       = DATA_SET_HOST
  
 OBJECT                           = DATA_SET_REFERENCE_INFORMATION
 REFERENCE_KEY_ID                 = "BINDERETAL1998"
 END_OBJECT                       = DATA_SET_REFERENCE_INFORMATION
  
END_OBJECT                        = DATA_SET
END