PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 101 FILE_RECORDS = 21692 DATA_SET_ID = "VEGA1-C-DUCMA-3-RDR-HALLEY-V1.0" TARGET_NAME = "HALLEY" ^TABLE = "DSFAST17.TAB" OBJECT = TABLE INTERCHANGE_FORMAT = ASCII ROWS = 21692 ROW_BYTES = 101 COLUMNS = 16 DESCRIPTION = "This file includes all the fast telemetry data (data obtained every two seconds). The fast telemetry data covers the entire Halley's comet encounter, lasting approximately four hours. The calibration and telemetry noise events have not been removed from the data. The mass thresholds for the Ducma detectors are: M1 1.5 X 10**-13 g M2 5.6 x 10**-11 g M3 1.6 x 10**-09 g M4 4.0 x 10**-08 g To get a conversion from the Ducma clock to UT you just need to know what days the Ducma clock started for Vega-1. The Ducma clock started on Dec. 15, 1984, at 10:33:37 UT (that is hour 10, min 33 and 37 seconds). Further information may be found in the Ducma Technical Manual, which is kept on file at the Planetary Data Systems Small Bodies Node." NOTE = "Although undocumented, the value '9999' appears to be used in the count fields to indicate invalid data. Also, there are several records at the beginning and end of the file which appear to contain garbled data in all fields." /* Column 1: Ducma clock time */ OBJECT = COLUMN NAME = "DUCMA_CLOCK_TIME" BYTES = 9 START_BYTE = 1 DATA_TYPE = ASCII_INTEGER FORMAT = "I9" UNIT = S DESCRIPTION= "The time at which data was obtained in seconds since the VEGA launch date" END_OBJECT = COLUMN /* Column 2: Blissi clock time */ OBJECT = COLUMN NAME = "BLISSI_CLOCK_TIME" BYTES = 5 START_BYTE = 11 DATA_TYPE = ASCII_INTEGER FORMAT = "I5" UNIT = S DESCRIPTION= "Blissi clock (as described in the Ducma technical manual" END_OBJECT = COLUMN /* Column 3: Status commands - first 8 bits */ OBJECT = COLUMN NAME = "STATUS_COMMAND_1" BYTES = 8 START_BYTE = 17 DATA_TYPE = CHARACTER FORMAT = "A8" DESCRIPTION= "First of two eight-bit status commands, described in the Ducma technical manual" END_OBJECT = COLUMN /* Column 4: Status commands - second 8 bytes */ OBJECT = COLUMN NAME = "STATUS_COMMAND_2" BYTES = 8 START_BYTE = 26 DATA_TYPE = CHARACTER FORMAT = "A8" DESCRIPTION= "Second of two eight-bit status commands, described in the Ducma technical manual" END_OBJECT = COLUMN /* Column 5: Detector Temperature */ OBJECT = COLUMN NAME = "DETECTOR_TEMPERATURE" BYTES = 6 START_BYTE = 35 DATA_TYPE = ASCII_REAL FORMAT = "F6.2" UNIT = "deg C" DESCRIPTION= "The temperature of the M detector housing, Celsius" END_OBJECT = COLUMN /* Column 6: Electronics temperature */ OBJECT = COLUMN NAME = "ELECTRONICS_TEMPERATURE" BYTES = 6 START_BYTE = 42 DATA_TYPE = ASCII_REAL FORMAT = "F6.2" UNIT = "deg C" DESCRIPTION= "The temperature of the electronics, Celsius" END_OBJECT = COLUMN /* Column 7: M4 counts */ OBJECT = COLUMN NAME = "M4" BYTES = 4 START_BYTE = 49 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION="Dust event count at the M4 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 8: M3 counts */ OBJECT = COLUMN NAME = "M3" BYTES = 4 START_BYTE = 54 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Dust even counts at the M3 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 9: M2 counts */ OBJECT = COLUMN NAME = "M2" BYTES = 4 START_BYTE = 59 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Dust event counts at the M2 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 10: M1 counts */ OBJECT = COLUMN NAME = "M1" BYTES = 4 START_BYTE = 64 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Dust event counts at the M1 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 11: M4 anticoicident counts */ OBJECT = COLUMN NAME = "M4NV" BYTES = 4 START_BYTE = 69 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Anticoincident counts at the M4 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 12: M3 anticoincident counts */ OBJECT = COLUMN NAME = "M3NV" BYTES = 4 START_BYTE = 74 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Anticoincident counts at the M2 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 13: M2 anticoincident counts */ OBJECT = COLUMN NAME = "M2NV" BYTES = 4 START_BYTE = 79 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Anticoincident counts at the M2 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 14: M1 anticoincident counts */ OBJECT = COLUMN NAME = "M1NV" BYTES = 4 START_BYTE = 84 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "Anticoincident counts at the M1 threshold" INVALID = 9999 END_OBJECT = COLUMN /* Column 15: Low-discrimination noise counts */ OBJECT = COLUMN NAME = "VL" BYTES = 4 START_BYTE = 89 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "V detector (noise) counts" INVALID = 9999 END_OBJECT = COLUMN /* Column 16: High-discrimination noise counts */ OBJECT = COLUMN NAME = "VH" BYTES = 4 START_BYTE = 94 DATA_TYPE = ASCII_INTEGER FORMAT = "I4" DESCRIPTION= "High-discrimination V detector (noise) counts" INVALID = 9999 END_OBJECT = COLUMN /* End of table */ END_OBJECT = TABLE END