Data Set Information
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| DATA_SET_NAME |
VEGA1 DUST PARTICLE IMPACT PLASMA DETECTOR DATA V1.0
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| DATA_SET_ID |
VEGA1-C-SP1-2-RDR-HALLEY-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Data Set Description : 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 Vega1 were as follows: Vega 1: R 0x : 7830 km; R0y : 2480 km; R0z : 3400 km; Vx : 28.64 km/s; Vy : -72.73 km/s; Vz :-12.95km/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 1399 records. Each record consists of a time of measurement column (referred to closest approach, where 0 sec is 4:12:38 UT), and 2 columns of impact plasma sensor data (channels 2 and 4+6 combined). 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 | +-----------------+----------------------+----------------------+
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| DATA_SET_RELEASE_DATE |
3000-01-01T00:00:00.000Z
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| START_TIME |
1986-03-06T06:29:20.000Z
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| STOP_TIME |
1986-03-06T07:16:18.000Z
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| MISSION_NAME |
VEGA 1
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| MISSION_START_DATE |
1984-12-15T12:00:00.000Z
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| MISSION_STOP_DATE |
1986-04-01T12:00:00.000Z
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| TARGET_NAME |
HALLEY
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| TARGET_TYPE |
COMET
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| INSTRUMENT_HOST_ID |
VEGA1
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| INSTRUMENT_NAME |
DUST IMPACT PLASMA DETECTOR
|
| INSTRUMENT_ID |
SP1
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| INSTRUMENT_TYPE |
ELECTRODE COLLECTOR
|
| NODE_NAME |
Small Bodies
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| ARCHIVE_STATUS |
ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview: N/A
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| CITATION_DESCRIPTION |
Balebanov V.M., Skuridin G.A., Vorontsova E.V., Bassolo V.S. and A. V. Dyachkov, VEGA1 DUST PARTICLE IMPACT PLASMA DETECTOR DATA V1.0, VEGA1-C-SP1-2-RDR-HALLEY-V1.0, NASA Planetary Data System, 1997
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| ABSTRACT_TEXT |
The SP-1 experiment on Vega spacecraft was intended for studying the spatial and mass distributions of dust particles in the cometary coma over the mass range 1.e-16 to 1.e-6 g. Covering such a broad mass range was made possible by using sensors of two types, namely, impact plasma and acoustic.
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| PRODUCER_FULL_NAME |
INTERNATIONAL HALLEY WATCH
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| SEARCH/ACCESS DATA |
SBN Comet Website
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