Data Set Information
DATA_SET_NAME VEGA2 DUST PARTICLE IMPACT PLASMA DETECTOR DATA V1.0
DATA_SET_ID VEGA2-C-SP1-2-RDR-HALLEY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION
Data Set Overview :  A number of datasets from the VEGA missions were submitted by Dyachkov at IKI as FITS files (binary data) using the GROUPS form or multidimensioned arrays. In addition, little information was provided except for the date, spacecraft, and experiment. Sometimes in the GROUPS parameters (Pvalues), there were experiment parameters such as 'time' indicated and by inference this could be determined to be exposure time versus a clock time. Since there was at least one extensive set of observations (TVS images), that were provided by IKI in this manner and a separate facility (KFKI) with the proper IHW keywords, it was possible to make estimates as to the meaning of 'time' with proper units (seconds).  The flyby trajectories of the Vega spacecraft in the cometocentric frame can be specified by the coordinates of the closest approach to the nucleus R0(R0x,R0y,R0z) and the components of the relative velocity V(Vx,Vy,Vz). The corresponding values for Vega2 were as follows:   Vega 2: R0x : 7100 km; R0y : 2680 km; R0z : 2630 km; Vx : 30.53 km/s; Vy : -69.44 km/s; Vz :-11.88km/s;   If the results of the dust flux measurements are referred to the time reckoned from the instant of closest approach, the corresponding distances to the cometary nucleus can be found as R:R0*sqrt(1 + (t/t0)**2), where the parameter t0 : R0/V.  The SP-1 data for Vega1 spacecraft are formatted into table containing Fro the SP-1 data each record consists of a time of measurement column (referred to closest approach, where 0 sec is 4:12:38 UT), and 7 columns (channels) for impact sensor plasma data. Total number of records is 2151. The table below shows the channels for given mass ranges.   +-----------------+----------------------+----------------------+ | Channel number | Charge pulse amp, C | Mass Range, g | +-----------------+----------------------+----------------------+ | 1 | 10**-7 - 10**-8 | 10**-10 - 10**-11 | | 2 | 10**-8 - 10**-9 | 10**-11 - 10**-12 | | 3 | 10**-9 - 10**-10 | 10**-12 - 10**-13 | | 4 | 10**-10 - 10**-11 | 10**-13 - 10**-14 | | 5 | 10**-11 - 10**-12 | 10**-14 - 10**-15 | | 6 | 10**-12 - 10**-13 | 10**-15 - 10**-16 | | 7 | 10**-13 - 3x10**-14 | 10**-16 - 3x10**-17 | +-----------------+----------------------+----------------------+
DATA_SET_RELEASE_DATE 3000-01-01T00:00:00.000Z
START_TIME 1986-03-09T06:29:22.000Z
STOP_TIME 1986-03-09T07:42:32.000Z
MISSION_NAME VEGA 2
MISSION_START_DATE 1984-12-21T12:00:00.000Z
MISSION_STOP_DATE 1986-04-01T12:00:00.000Z
TARGET_NAME HALLEY
TARGET_TYPE COMET
INSTRUMENT_HOST_ID VEGA2
INSTRUMENT_NAME DUST IMPACT PLASMA DETECTOR
INSTRUMENT_ID SP1
INSTRUMENT_TYPE ELECTRODE COLLECTOR
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE
Confidence Level Overview :  N/A
CITATION_DESCRIPTION Balebanov V.M., Skuridin G.A., and A. V. Dyachkov, VEGA2 DUST PARTICLE IMPACT PLASMA DETECTOR DATA V1.0, VEGA2-C-SP1-2-RDR-HALLEY-V1.0, NASA Planetary Data System, 1997
ABSTRACT_TEXT A number of datasets from the VEGA missions were submitted by Dyachkov at IKI as FITS files (binary data) using the GROUPS form or multidimensioned arrays. In addition, little information was provided except for the date, spacecraft, and experiment. Sometimes in the GROUPS parameters (Pvalues), there were experiment parameters such as 'time' indicated and by inference this could be determined to be exposure time versus a clock time. Since there was at least one extensive set of observations (TVS images), that were provided by IKI in this manner and a separate facility (KFKI) with the proper IHW keywords, it was possible to make estimates as to the meaning of 'time' with proper units (seconds).
PRODUCER_FULL_NAME INTERNATIONAL HALLEY WATCH
SEARCH/ACCESS DATA
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