******************************************************************************** Orientation of the Voyager 2 Scan Platform during the Saturn Encounter ====================================================================== Version 1: Discontinuous, Uncorrected ISS SEDR Pointing ======================================================= This is a Type 1 (discontinuous) C kernel containing pointing information for the Voyager 2 scan platform during the Saturn encounter. Note that the scan platform's coordinate system is defined as coincident with that of the narrow-angle camera. This C kernel describes the pointing relative to the J2000 coordinate frame only at the discrete moments when Voyager images were taken. Data Summary ------------ This C kernel was generated using the pointing information encapsulated in the "Supplemental Experiment Data Record" (SEDR) file for the Imaging Science Subsystem (ISS). The SEDR file was originally generated shortly after the Voyager flyby in Vax binary format. It was provided by the Multimission Image Processing Laboratory (MIPL) at JPL. Pedigree -------- Only one correction has been applied to the SEDR data. The SEDR file provides pointing information for both the wide- and narrow-angle cameras. These cameras have a small offset, which is recorded in the Voyager Frames kernel. However, it became apparent that the SEDR file was generated using an incorrect value for this offset. The (incorrect) value used in the SEDR file was revealed as a constant offset between the optic axes of wide- and narrow-angle images shuttered simultaneously. By removing this offset, it was possible to determine the orientation of the scan platform in a consistent manner, regardless of whether the SEDR data described a a wide- or a narrow-angle image. The C kernel was generated using SPICE program MSOPCK. Accuracy -------- Long experience with the SEDR file has revealed its pointing information to be accurate to typically ~ 100 narrow-angle pixels, which is equivalent to ~ 0.05 degrees or ~ 1 milliradian. This C kernel was generated by the PDS Rings Node. We hope to generate improved C kernels (continuous and C-smithed) at a later date. Contact Information ------------------- Mark R. Showalter Manager, PDS Rings Node SETI Institute mshowalter@seti.org ******************************************************************************** MSOPCK SETUP FILE: v2sat_version1_type1_iss_sedr.ker ******************************************************************************** \begindata INTERNAL_FILE_NAME = 'v2sat_version1_type1_iss_sedr.ck' COMMENTS_FILE_NAME = 'v2sat_version1_type1_iss_sedr.txt' LSK_FILE_NAME = 'naif0008.tls' SCLK_FILE_NAME = 'vg200010.tsc' FRAMES_FILE_NAME = 'vg2_v02.tf' CK_TYPE = 1 INSTRUMENT_ID = -32100 REFERENCE_FRAME_NAME = 'J2000' ANGULAR_RATE_PRESENT = 'NO' INPUT_DATA_TYPE = 'MATRICES' INPUT_TIME_TYPE = 'SCLK' PRODUCER_ID = 'Mark R. Showalter/PDS Rings Node' \begintext ******************************************************************************** RUN-TIME OBTAINED META INFORMATION: ******************************************************************************** PRODUCT_CREATION_TIME = 2007-06-05T14:54:23 START_TIME = 1981-06-05T16:35:19.337 STOP_TIME = 1981-09-25T18:53:32.372 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -32100, COVERG: 1981-06-05T16:35:19.337 1981-09-25T18:53:32.372 -------------------------------------------------------------------------------- DISCRETE POINTING DATA -- COVERAGE SUMMARY IS NOT APPLICABLE ******************************************************************************** ******************************************************************************** MSOPCK SETUP FILE: vg2_sat_version1_type1_iss_sedr.ker ******************************************************************************** \begindata INTERNAL_FILE_NAME = 'vg2_sat_version1_type1_iss_sedr.ck' COMMENTS_FILE_NAME = 'vg2_sat_version1_type1_iss_sedr.txt' LSK_FILE_NAME = 'naif0008.tls' SCLK_FILE_NAME = 'vg200010.tsc' FRAMES_FILE_NAME = 'vg2_v02.tf' CK_TYPE = 1 INSTRUMENT_ID = -32100 REFERENCE_FRAME_NAME = 'J2000' ANGULAR_RATE_PRESENT = 'NO' INPUT_DATA_TYPE = 'MATRICES' INPUT_TIME_TYPE = 'SCLK' PRODUCER_ID = 'Mark R. Showalter/PDS Rings Node' \begintext ******************************************************************************** RUN-TIME OBTAINED META INFORMATION: ******************************************************************************** PRODUCT_CREATION_TIME = 2007-06-05T15:03:31 START_TIME = 1981-06-05T16:35:19.337 STOP_TIME = 1981-09-25T18:53:32.372 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -32100, COVERG: 1981-06-05T16:35:19.337 1981-09-25T18:53:32.372 -------------------------------------------------------------------------------- DISCRETE POINTING DATA -- COVERAGE SUMMARY IS NOT APPLICABLE ******************************************************************************** ******************************************************************************** MSOPCK SETUP FILE: vg2_sat_version1_type1_iss_sedr.ker ******************************************************************************** \begindata INTERNAL_FILE_NAME = 'vg2_sat_version1_type1_iss_sedr.ck' COMMENTS_FILE_NAME = 'vg2_sat_version1_type1_iss_sedr.txt' LSK_FILE_NAME = 'naif0008.tls' SCLK_FILE_NAME = 'vg200010.tsc' FRAMES_FILE_NAME = 'vg2_v02.tf' CK_TYPE = 1 INSTRUMENT_ID = -32100 REFERENCE_FRAME_NAME = 'J2000' ANGULAR_RATE_PRESENT = 'NO' INPUT_DATA_TYPE = 'MATRICES' INPUT_TIME_TYPE = 'SCLK' PRODUCER_ID = 'Mark R. Showalter/PDS Rings Node' \begintext ******************************************************************************** RUN-TIME OBTAINED META INFORMATION: ******************************************************************************** PRODUCT_CREATION_TIME = 2007-06-05T15:08:58 START_TIME = 1981-06-05T16:35:19.337 STOP_TIME = 1981-09-25T18:53:32.372 ******************************************************************************** INTERPOLATION INTERVALS IN THE FILE SEGMENTS: ******************************************************************************** SEG.SUMMARY: ID -32100, COVERG: 1981-06-05T16:35:19.337 1981-09-25T18:53:32.372 -------------------------------------------------------------------------------- DISCRETE POINTING DATA -- COVERAGE SUMMARY IS NOT APPLICABLE ********************************************************************************