Data Set Overview
    =================
    Encounter Data for Vega-1 included two files: DSFAST17
    and Dvega101. These files were submitted by the Univ
    of Chicago group with hard copy versions of the operating
    manual and a preprint of results.  The following
    explanation of the contents of the two files is below.
 
     The DSFAST17 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
    telemetry noise events have not been removed from the
    data.  Each readout includes; 1)the time at which
    data was obtained in seconds (given in time since the
    Vega launch date),and the Blissi clock described in
    the technical manual, 2) Two eight integer status
    commands also described in the Ducma Technical
    Manual, 3) two temperatures,the detector temperature
    and the electronic temperature explained in the
    technical manual, 4) the dust events given as ten
    integers which represent counts in each of four
    different thresholds,M4-M1,as well as the
    anticoincident counts,M4NV-M1NV, and the two V
    detector counts, VL and VH, which register noise
    events.  More detailed explanations may be found in
    the Ducma technical manual which is available through
    PDS-SBN.  The masses corresponding to thresholds M1
    through M4 are given below:
 
 
        M1: 1.5x10**-13 g
    	M2: 5.6x10**-11 g
    	M3: 1.6x10**-9 g
        M4: 4.0x10
 
    A sample data line appears as follows:
 
 
Ducma     Blissi     Command     Status      Detector    Elect.
clock     clock                               Temp.      Temp.
38252812     1      10100100    11011001     -18.01      30.86
 
 
M4    M3      M2    M1    M4NV   M3NV   M2NV   M1NV    VL     VH
0     0       1     2       0      0      0      0      0      0
 
 
    Dvega101 file includes the encounter data without any
    information about status commands and temperature
    variations.  The noise spikes have been removed.
     This file is designed for easy data analysis and
    lists simply the time of an event in seconds and the
    total counts in each threshold, M4-M1, the
    anticoincident events, M4NV-M1NV, and the noise
    events,VL and VH, all obtained during that time
    interval.
 
     Below are charts to help in the conversion of BLISSI
    clock times for Vega1 to DUCMA clock times and
    'calendar time'.
 
     DUCMA times are given in seconds after launch BLISSI
    times are given in seconds
 
 
Vega1
DUCMA start time: Dec. 15 1984 10:33:37
from file dsfast17.tab
------------+-----------+--------------------------+--------------------+
 DUCMA time |BLISSI time|    DUCMA Time to CA 	   |      Real time	|
  (seconds) | (seconds)	| (seconds) |(DD hh:mm:ss) | (YY-MM-DDThh:mm:ss)|
------------+-----------+-----------+--------------+--------------------+
  37910088  |    179	|   612424  | 07 02:07:04  |  86-02-27T05:13:02	|
  37917104  |   7195	|   605408  | 07 00:10:08  |  86-02-27T07:09:58	|
  38344948  |      8	|   177564  | 02 01:19:24  |  86-03-04T06:00:42	|
  38352136  |   7196	|   170376  | 01 23:19:36  |  86-03-04T08:00:30	|
  38431348  |     13	|    91164  | 01 01:19:24  |  86-03-05T06:00:42	|
  38438524  |   7191	|    83988  | 00 23:19:48  |  86-03-05T08:00:18	|
  38511536  |      2	|    10976  | 00 03:02:56  |  86-03-06T04:17:10	|
* 38522512  |  10976 	|        0  | 00 00:00:00  |  86-03-06T07:20:06 |
  38526412  |  14878	|     3900  | 00 01:05:00  |  86-03-06T08:25:06	|
  38612184  |    202	|    89672  | 01 00:54:32  |  86-03-07T08:14:38	|
  38619168  |   7188	|    96656  | 01 02:50:56  |  86-03-07T10:11:02	|
------------+-----------+-----------+--------------+--------------------+
 
*-times of Closest Approach (CA)

Confidence Level Overview
    =========================
      N/A