OBJECT     = DATA_SET
DATA_SET_ID                    = "VEGA1-C-SP1-2-RDR-HALLEY-V1.0"

OBJECT     = DATA_SET_INFORMATION 
DATA_SET_NAME        = "VEGA1 DUST PARTICLE IMPACT PLASMA DETECTOR DATA V1.0"
DATA_SET_COLLECTION_MEMBER_FLG = Y
START_TIME                     = 1986-03-06T06:29:20.000Z
STOP_TIME                      = 1986-03-06T07:16:18.000Z
DATA_OBJECT_TYPE               = TABLE
DATA_SET_RELEASE_DATE          = UNK
PRODUCER_FULL_NAME             = "INTERNATIONAL HALLEY WATCH"
DETAILED_CATALOG_FLAG          = N
DATA_SET_DESC                  =
"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:   R0x = 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 |       
      +-----------------+----------------------+----------------------+       
                                                                              
"

CONFIDENCE_LEVEL_NOTE          = "N/A"
END_OBJECT = DATA_SET_INFORMATION

OBJECT     = DATA_SET_TARGET
TARGET_NAME                    =  HALLEY
END_OBJECT = DATA_SET_TARGET                    

OBJECT     = DATA_SET_HOST
INSTRUMENT_HOST_ID             = VEGA1
INSTRUMENT_ID                  = SP1
END_OBJECT = DATA_SET_HOST

OBJECT     = DATA_SET_REFERENCE_INFORMATION
REFERENCE_KEY_ID               = "ESA-SP1066"
END_OBJECT = DATA_SET_REFERENCE_INFORMATION

OBJECT     = DATA_SET_REFERENCE_INFORMATION
REFERENCE_KEY_ID               = "NATURE321"
END_OBJECT = DATA_SET_REFERENCE_INFORMATION

END_OBJECT = DATA_SET
END