PDS_VERSION_ID = PDS3
LABEL_REVISION_NOTE = "
2014-08-26 SwRI:BTCarcich updated comments, MET UNIT, MET DESCRIPTION
"
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 40
FILE_RECORDS = 629
^TABLE = ("NH_MET2UTC.TAB", 1)
MISSION_NAME = "NEW HORIZONS"
INSTRUMENT_HOST_NAME = "NEW HORIZONS"
DATA_SET_ID = "NH-X-SWAP-2-PLUTOCRUISE-V3.0"
PRODUCER_INSTITUTION_NAME = "SOUTHWEST RESEARCH INSTITUTE"
PRODUCT_CREATION_TIME = 2014-08-26
OBJECT = TABLE
INTERCHANGE_FORMAT = ASCII
ROWS = 629
COLUMNS = 2
ROW_BYTES = 40
NAME = "MET_CONVERSION_TABLE"
DESCRIPTION = "This table contains information for
converting between Mission Elapsed Time (MET) and Universal Coordinated
Time (UTC). It is only an approximation; see caveats that follow.
N.B. This series of caveats is a necessary result of the fact that this
TABLE and this PDS label undergo continuing reviews by PDS peer
reviewers and are assessed liens from time to time.
N.B. This table is neither required nor recommended for use in working
with New Horizon data by the New Horizons project,
but was only provided as required by a lien levied during a PDS
peer review. Simple linear interpolation is the only practical
method to convert times not at the endpoints of the piecewise
continuous function this TABLE presents, although so doing
will not account for discontinuities in UTC (leap seconds) or in
MET (spacecraft clock partition boundaries). To deal with such
discontinuities, the user must follow the proper procedure as
directed below; this TABLE is only provided as an approximation
tool; as such this TABLE contains provision for neither identifying
nor handling UTC or MET discontinuities.
N.B. The proper procedure for converting between MET and UTC is to
use the SPICE toolkit (http://naif.jpl.nasa.gov) and the SCLK
correlation provided with the New Horizons SPICE data set,
NH-J/P/SS-SPICE-6-V1.0. This file has only been provided as a
convenience when the highest level of precision is not necessary
(e.g. see next N.B.).
N.B. The correlation in this file is extrapolated into the future,
relative to the PRODUCT_CREATION_TIME, and for those times does
not account for future events such as changes in the spacecraft
clock rate, leap seconds, etc. The intent is to provide updated
versions of this file thoughout the project, so users of this
file should use the SPICE toolkit when interpreting data with
an observation date beyond the PRODUCT_CREATION_TIME of this
file.
"
OBJECT = COLUMN
NAME = "MET"
START_BYTE = 1
BYTES = 10
COLUMN_NUMBER = 1
DATA_TYPE = ASCII_INTEGER
FORMAT = "I10"
DESCRIPTION = "This column is the MET of the spacecraft
clock; as such, the UNIT of SECOND implies
second as measured by the on-board spacecraft
clock and not the International System of
Units (SI) unit of second"
UNIT = "SECOND"
END_OBJECT = COLUMN
OBJECT = COLUMN
NAME = "UTC"
START_BYTE = 16
BYTES = 23
FORMAT = "A23"
COLUMN_NUMBER = 2
DATA_TYPE = TIME
END_OBJECT = COLUMN
END_OBJECT = TABLE
END
|