PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 72 FILE_RECORDS = 13808 ^TABLE = "OPERAW.TAB" DATA_SET_ID = "GIO-C-OPE-3-RDR-GRIGG-SKJELL-V1.0" PRODUCT_ID = "OPE-OPERAW-199512" PRODUCT_CREATION_TIME = 1995-08-18 PRODUCT_NAME = "Giotto Extended Mission OPE, Raw Data" TARGET_NAME = "26P/GRIGG-SKJELLERUP 1 (1922 K1)" INSTRUMENT_HOST_NAME = "GIOTTO" INSTRUMENT_NAME = "OPTICAL PROBE EXPERIMENT" START_TIME = 1992-07-10T14:16:39.071 STOP_TIME = 1992-07-10T16:14:59.287 SPACECRAFT_CLOCK_START_COUNT = "UNK" SPACECRAFT_CLOCK_STOP_COUNT = "UNK" DESCRIPTION = "This file contains raw, decommuted significant data taken by the Optical Probe Experiment (OPE) aboard the GIOTTO space- craft during the fly-by of comet Grigg-Skjellerup on 10 July 1992." RECORD_FORMAT = "I8,1X,I2,1X,I2,1X,F4.1,2(1X,I5), 1X,I2,1X,I5,1X,I4,1X,I5,2(1X,I4),2(1X,I3)" OBJECT = TABLE NAME = "RAW DATA" INTERCHANGE_FORMAT = ASCII COLUMNS = 14 ROW_BYTES = 72 ROWS = 13808 DESCRIPTION = "Table of time, tags and counts in each channel. Note that the time elements in columns 2-4 are separated by colons rather than blanks. The counts in each channel are recorded over 1/8 of a spin. Center wavelengths are all approximate and given in nanometers. Although the authors indicated that some of these fields could be disregarded, no data have been removed from this file. Fields of questionable value are flagged with a NOTE. DESCRIPTIONs for the following fields are taken from documentation supplied with the data file by J. B. Renard and A.C.Levasseur-Regourd." OBJECT = COLUMN NAME = GRT BYTES = 8 DATA_TYPE = ASCII_INTEGER START_BYTE = 1 FORMAT = "I8" UNIT = "MILLISECONDS" DESCRIPTION = "Ground receiving time (UT), in milliseconds since midnight of 10 July 1992. Due to the acquisition time, the accuracy is about 0.2 sec." END_OBJECT OBJECT = COLUMN NAME = HOURS BYTES = 2 DATA_TYPE = ASCII_INTEGER START_BYTE = 10 FORMAT = "I2" DESCRIPTION = "GRT equivalent hours" END_OBJECT OBJECT = COLUMN NAME = MINUTES BYTES = 2 DATA_TYPE = ASCII_INTEGER START_BYTE = 13 FORMAT = "I2" DESCRIPTION = "GRT equivalent minutes" END_OBJECT OBJECT = COLUMN NAME = SECONDS BYTES = 4 DATA_TYPE = ASCII_REAL START_BYTE = 16 FORMAT = "F4.1" DESCRIPTION = "GRT equivalent seconds" END_OBJECT OBJECT = COLUMN NAME = TAG BYTES = 6 DATA_TYPE = ASCII_INTEGER START_BYTE = 20 FORMAT = "I6" DESCRIPTION = "Reference number of the data line. There are 8 tags per spin. Some tags are missing due to telemetry losses." END_OBJECT OBJECT = COLUMN NAME = BLUE_DUST_COUNT BYTES = 6 DATA_TYPE = ASCII_INTEGER START_BYTE = 26 FORMAT = "I6" DESCRIPTION = "Number of counts in the blue dust channel (442 nm)" END_OBJECT OBJECT = COLUMN NAME = UV_DUST_COUNT BYTES = 3 DATA_TYPE = ASCII_INTEGER START_BYTE = 32 FORMAT = "I3" DESCRIPTION = "Number of counts in the UV dust channel" NOTE = "This channel of the detector was disconnected at launch. The corresponding data are not meaningful." END_OBJECT OBJECT = COLUMN NAME = GREEN_DUST_COUNT BYTES = 6 DATA_TYPE = ASCII_INTEGER START_BYTE = 35 FORMAT = "I6" DESCRIPTION = "Number of counts in the green dust channel (577nm)" END_OBJECT OBJECT = COLUMN NAME = RED_DUST_COUNT BYTES = 5 DATA_TYPE = ASCII_INTEGER START_BYTE = 41 FORMAT = "I5" DESCRIPTION = "Number of counts in the red dust channel (718 nm). Due to its low sensitivity, this channel is significantly affected by crosstalk." END_OBJECT OBJECT = COLUMN NAME = "CO+ DUST COUNT" BYTES = 6 DATA_TYPE = ASCII_INTEGER START_BYTE = 46 FORMAT = "I6" DESCRIPTION = "Number of counts in the CO+ with dust channel (426 nm)" END_OBJECT OBJECT = COLUMN NAME = OH_DUST_COUNT BYTES = 5 DATA_TYPE = ASCII_INTEGER START_BYTE = 52 FORMAT = "I5" DESCRIPTION = "Number of counts in the OH with dust channel (307 nm). Due to its low sensitivity, this channel is significantly affected by crosstalk." END_OBJECT OBJECT = COLUMN NAME = "CN/C2 COUNT" BYTES = 5 DATA_TYPE = ASCII_INTEGER START_BYTE = 57 FORMAT = "I5" DESCRIPTION = "Number of counts in the multiplexed (387nm = CN with dust and 517nm = C2 with dust) channels. The two channels alternate every half rotation of the spacecraft, i.e., after every four sectors. CN is measured in sectors 1 through 4 and C_2 is measured in sectors 5 through 0 (sectors are given by the tag number, modulo 8)." END_OBJECT OBJECT = COLUMN NAME = DARK_CHANNEL_COUNT BYTES = 4 DATA_TYPE = ASCII_INTEGER START_BYTE = 62 FORMAT = "I4" DESCRIPTION = "Number of counts in the dark channel. The signal is affected by crosstalk." END_OBJECT OBJECT = COLUMN NAME = HOUSEKEEPING BYTES = 4 DATA_TYPE = ASCII_INTEGER START_BYTE = 66 FORMAT = "I4" DESCRIPTION = "Bit-encoded values for low voltage, high voltage, and 6 temperature probes inside the instrument. The bits give, in order, the status of high voltage, temperatures at the detector (2 bits), at the filters (2 bits), at the electronics (2 bits), and the low-voltage supply. All parameters are at their nominal values throughout the encounter." END_OBJECT END_OBJECT = TABLE END