Data Set Information
DATA_SET_NAME GO UVS TABULAR DATA FROM THE SL9 IMPACT WITH JUPITER V1.0
DATA_SET_ID GO-J-UVS-2-EDR-SL9-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The UltraViolet Spectrometer (UVS) on the Galileo spacecraft took unique data of Comet Shoemaker-Levy/9's impact with Jupiter. A preliminary analysis of this data is presented in this submission to the Planetary Data System (PDS). It consists of two small tables with detached labels and documentation. Background : Galileo observed the S-L9 fragment G impact by oscillating the scan-platform so that the fields of view of the scan-platform instruments moved to-and-fro across Jupiter. Each to-and-fro 'swath' lasted 10 2/3 sec, and consisted of two 5 1/3 sec 'passes'. During the observations, the UVS acquired one measurement every 7.6 msec (more precisely, 4.0/528 sec); during each measurement, the counting gate was open for 6.0 msec. Thus, each 10 2/3 sec swath contained 1408 6-msec samples. The data-taking was, however, not continuous, and the data received was occasionally corrupted. The data presented here and used in Hord et al. (1995) [HORDETAL1995] has all been inspected and verified. Tables in the Dataset : The following is a list of the UVS data files for the Shoemaker-Levy fragment R and G impacts. Each file record represents one UVS RIM of fourteen spectra, with a duration of 60.666 seconds. FILENAME FIRST RECORD STARTS AT LAST RECORD STARTS AT SCLK SCLK AT SPACECRAFT UTC UTC AT SPACECRAFT ------------------------------------------------------------------------ Experimenter Data Records (EDRs) GFRAGTIM.DAT 2486477:00 2486487:00 1994-199//07:02:14.445 1994-199//07:12:21.112 RFRAGTIM.DAT 2490632:00 2490643:00 1994-202//05:03:24.284 1994-202//05:14:31.617 Details of the structure and contents of these tables may be found in the discussion below as well as in the detached PDS label. GFRAGTIM.DAT ------------ This file contains the G fragment data and a timescale. Each record has a 10 point header and 8008 data points. Record 0 is the time scale. Each position holds the number of seconds from the start of the rim for the corresponding position in a data record. The header values of this record are zeros. Records 1 to 11 contain all data records. The data starts at position 10. All fiducials (except the 1st one in each Rim) have been replaced with 44 -1's and there are an additional 84 -1's at the end of each record to represent the 84 missing bytes in the last spectra. Header info for data records: 0 : rim timetag (Spacecraft Event Time) 1-5 contain the SCET converted to UTC format; value is at the s/c 1 : year 2 : day of year 3 : hours 4 : minutes 5 : seconds 6 : time value in seconds used to convert from SCET to earth based observation time. NOTE: There is a single -1 in record 6. This is a noise point changed by hand. Its previous value was 33. Also, there is data for the end of rim 2486485, but JPL made an error when they made the file containing it so it is not included in this file. There are 2 fiducials 3 minor frames apart. It looks like a piece of data was written at an incorrect time position, over the top of data already there. RFRAGTIM.DAT ------------ This file contains the R fragment data and a timescale. Each record has a 10 point header and 8008 data points. Record 0 is the time scale. Each position holds the number of seconds from the start of the rim for the corresponding position in a data record. The header values of this record are zeros. Records 1 to 9 contain all data records. The data starts at position 10. All fiducials have been replaced with 44 -1's and there are an additional 84 -1's at the end of each record to represent the 84 missing bytes in the last spectra. Header info for data records: 0 : rim timetag (Spacecraft Event Time) 1-5 contain the SCET converted to UTC format 1 : year 2 : day of year 3 : hours 4 : minutes 5 : seconds NOTE: Record 4 is timetagged 2490635:00 and record 5 is 2490639:00. This three rim gap is the result of a change in the playback requested by NIMS. At this time, there is no data for record 8 (2490642). Processing : These files were produced by the Galileo UVS/EUV team at the Laboratory for Atmospheric and Space Physics at the University of Colorado at Boulder. The data contained in the files were generated during the analysis of UVS data from the Shoemaker-Levy 9 comet Fragment G Jupiter impact. This analysis is reported in Geophysical Research Letters, Vol 22, No. 12, pages 1565-1568, June 15, 1995, by C.W. Hord, et al. [HORDETAL1995] Software : The two tables in this dataset are small and in binary (XDR) format. Media/Format : This dataset is an electronic submission to PDS but may be included on a future CD-ROM volume of UVS data from the Jupiter Tour. Formats are based on standards for table objects established by PDS.
DATA_SET_RELEASE_DATE 1996-07-01T00:00:00.000Z
START_TIME 1994-07-18T07:02:14.445Z
STOP_TIME 1994-07-21T05:15:32.283Z
MISSION_NAME COMET SL9/JUPITER COLLISION
GALILEO
MISSION_START_DATE 1993-01-01T12:00:00.000Z
1977-10-01T12:00:00.000Z
MISSION_STOP_DATE 1996-01-01T12:00:00.000Z
2003-09-21T12:00:00.000Z
TARGET_NAME SL9
JUPITER
TARGET_TYPE COMET
PLANET
INSTRUMENT_HOST_ID GO
INSTRUMENT_NAME ULTRAVIOLET SPECTROMETER
INSTRUMENT_ID UVS
INSTRUMENT_TYPE ULTRAVIOLET SPECTROMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : A one second error associated with a missing leapsecond in early versions of this data set has been corrected here.
CITATION_DESCRIPTION Simmons, K.E., and C.W. Hord, GO UVS TABULAR DATA FROM THE SL9 IMPACT WITH JUPITER V1.0, GO-J-UVS-2-EDR-SL9-V1.0, NASA Planetary Data System, 1996.
ABSTRACT_TEXT The UltraViolet Spectrometer (UVS) on the Galileo spacecraft took unique data of Comet Shoemaker-Levy/9's impact with Jupiter. A preliminary analysis of this data is presented in this submission to the Planetary Data System (PDS). It consists of two small tables with detached labels and documentation.
PRODUCER_FULL_NAME KAREN E. SIMMONS
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