OBJECT = DATA_SET DATA_SET_ID = "GO-J-UVS-2-EDR-SL9-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "GO UVS Tabular Data from the SL9 Impact with Jupiter v1.0" DATA_SET_COLLECTION_MEMBER_FLG = "Y" START_TIME = 1994-199T07:02:14.445Z STOP_TIME = 1994-202T05:15:32.283Z DATA_SET_RELEASE_DATE = 1996-07-01 DATA_OBJECT_TYPE = TABLE PRODUCER_FULL_NAME = "Karen E. Simmons" DETAILED_CATALOG_FLAG = "N" DATA_SET_DESC = " 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) 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 fidutials (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 fidutials 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 fidutials 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. 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." CONFIDENCE_LEVEL_NOTE = "A one second error associated with a missing leapsecond in early versions of this data set has been corrected here." END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_TARGET TARGET_NAME = JUPITER END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_TARGET TARGET_NAME = "SL9" END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = GO INSTRUMENT_ID = UVS END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "HORDETAL1995" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END