M01 Spacecraft Orientation CK File for Cruise, Part 2 =========================================================================== Created by Boris Semenov, NAIF/JPL, November 14, 2001 Orientation Data in the File -------------------------------------------------------- This file contains orientation and angular velocity data for the Mars-01 Odyssey (M01) spacecraft frame, 'M01_SPACECRAFT', relative to the 'MARSIAU' inertial frame. The NAIF ID code for the 'M01_SPACECRAFT' frame is -53000. Status -------------------------------------------------------- This file was created by NAIF for archiving with the Planetary Data System (PDS) from daily CK files produced by NAIF Team at JPL, Pasadena. Pedigree -------------------------------------------------------- The original CK files used to create this file were officially delivered to the M01 project by the NAIF Team. These files contained spacecraft frame orientation relative to the 'MARSIAU' inertial frame. The orientation was computed, converted to quaternions and filtered on board; filtered quaternions were transmitted to the Earth in channelized telemetry. On the ground quaternions were extracted from telemetry and written to daily CK files using the MSOPCK program. The individual daily files were merged together to provide complete coverage on a mission phase basis. A table containing the complete list of original CK files from which data were included in this file is provided at the end of these comments. Approximate Time Coverage -------------------------------------------------------- This file covers the middle part of the Cruise phase of the mission: COVERAGE BEGIN TIME (UTC): 2001-07-01T00:00:14.977 COVERAGE END TIME (UTC): 2001-08-31T23:59:58.643 This file is a type 3 CK file which provides linear interpolation between orientation data points extracted from telemetry. Such interpolation is not applied to the whole coverage of the file but only inside intervals where enough orientation telemetry data was available and orientation data points were close to each other in time for such interpolation to make sense. The nominal quaternion time spacing in the telemetry stream varied from a fraction of a second to 3-4 seconds between adjacent data points. Considering that the s/c was nominally nadir pointed for all science data collection periods and three axis stabilized from most other operation regimes, the duration of the longest interval over which the data may be interpolated was set to 60 seconds. For all requests for data falling between two adjacent data points separated by more than 60 seconds the SPICELIB CK readers will return a logical flag stating "POINTING NOT FOUND". A table containing the complete list of valid interpolation intervals in the file is provided at the end of these comments. Angular Rate Data Note -------------------------------------------------------- Most records in this file do not contain actual angular rates computed on-board because the angular rates were not available in all telemetry packets containing quaternions. Instead, the angular rates stored in the file were "manufactured" by MSOPCK program using an assumption that the spacecraft was rotating at a constant rate between each two orientations specified by neighbor quaternions. Only records that fall inside the interval listed in this table contain actual telemetered angular rate data: 2001-07-01T00:00:00.000 2001-07-20T23:59:59.999 Usage Note -------------------------------------------------------- In order to use this file an M01 SCLK file containing coefficients mapping M01 on-board time to ET must be loaded into a user's program. Related Kernels -------------------------------------------------------- This file was created with LSK file naif0007.tls and M01 SCLK file ORB1_SCLKSCET.00017.tsc. Contacts -------------------------------------------------------- If you have any question regarding this data contact NAIF at JPL: Charles H. Acton, Jr (818)-354-3869 chuck.acton@jpl.nasa.gov Boris V. Semenov (818)-354-8136 boris.semenov@jpl.nasa.gov Appendix 1: List of the original CK files -------------------------------------------------------- m01_sc_2001-07-01.bc m01_sc_2001-07-02.bc m01_sc_2001-07-03.bc m01_sc_2001-07-04.bc m01_sc_2001-07-05.bc m01_sc_2001-07-06.bc m01_sc_2001-07-07.bc m01_sc_2001-07-08.bc m01_sc_2001-07-09.bc m01_sc_2001-07-10.bc m01_sc_2001-07-11.bc m01_sc_2001-07-12.bc m01_sc_2001-07-13.bc m01_sc_2001-07-15.bc m01_sc_2001-07-16.bc m01_sc_2001-07-17.bc m01_sc_2001-07-18.bc m01_sc_2001-07-19.bc m01_sc_2001-07-20.bc m01_sc_2001-07-21.bc m01_sc_2001-07-22.bc m01_sc_2001-07-23.bc m01_sc_2001-07-24.bc m01_sc_2001-07-25.bc m01_sc_2001-07-26.bc m01_sc_2001-07-27.bc m01_sc_2001-07-28.bc m01_sc_2001-07-29.bc m01_sc_2001-07-30.bc m01_sc_2001-07-31.bc m01_sc_2001-08-01.bc m01_sc_2001-08-02.bc m01_sc_2001-08-03.bc m01_sc_2001-08-04.bc m01_sc_2001-08-05.bc m01_sc_2001-08-06.bc m01_sc_2001-08-07.bc m01_sc_2001-08-08.bc m01_sc_2001-08-09.bc m01_sc_2001-08-10.bc m01_sc_2001-08-11.bc m01_sc_2001-08-12.bc m01_sc_2001-08-13.bc m01_sc_2001-08-14.bc m01_sc_2001-08-15.bc m01_sc_2001-08-16.bc m01_sc_2001-08-17.bc m01_sc_2001-08-18.bc m01_sc_2001-08-19.bc m01_sc_2001-08-20.bc m01_sc_2001-08-21.bc m01_sc_2001-08-22.bc m01_sc_2001-08-23.bc m01_sc_2001-08-24.bc m01_sc_2001-08-25.bc m01_sc_2001-08-26.bc m01_sc_2001-08-27.bc m01_sc_2001-08-28.bc m01_sc_2001-08-29.bc m01_sc_2001-08-30.bc m01_sc_2001-08-31.bc Appendix 2: Interpolation Intervals in the File -------------------------------------------------------- 2001-07-01T00:00:14.977 2001-07-01T05:17:58.019 2001-07-01T05:29:50.814 2001-07-04T05:12:52.161 2001-07-04T05:32:20.851 2001-07-05T22:57:06.910 2001-07-06T02:03:58.821 2001-07-06T02:13:42.816 2001-07-06T02:21:02.811 2001-07-06T02:21:18.811 2001-07-06T02:23:58.811 2001-07-06T06:29:38.684 2001-07-06T06:32:46.684 2001-07-08T05:23:17.288 2001-07-08T05:26:29.389 2001-07-08T10:55:29.727 2001-07-08T12:05:13.091 2001-07-08T12:05:29.091 2001-07-08T12:07:05.091 2001-07-08T12:08:33.091 2001-07-08T12:11:05.087 2001-07-08T12:12:29.086 2001-07-08T12:13:49.086 2001-07-08T12:21:49.082 2001-07-08T12:26:37.081 2001-07-08T12:27:01.081 2001-07-08T12:31:37.077 2001-07-08T12:45:21.071 2001-07-08T12:47:41.071 2001-07-09T05:27:40.579 2001-07-09T05:38:41.273 2001-07-10T07:23:23.811 2001-07-10T09:27:11.751 2001-07-11T05:22:35.161 2001-07-11T05:31:43.757 2001-07-13T21:14:53.251 2001-07-13T22:47:25.804 2001-07-13T23:59:57.769 2001-07-15T00:00:29.068 2001-07-18T04:03:10.244 2001-07-18T04:06:10.243 2001-07-18T05:02:18.214 2001-07-18T06:02:18.188 2001-07-18T06:02:22.185 2001-07-18T06:04:50.184 2001-07-20T04:57:12.812 2001-07-20T05:59:32.782 2001-07-23T04:47:02.658 2001-07-23T05:49:22.624 2001-08-05T07:10:25.479 2001-08-05T07:12:29.475 2001-08-15T11:44:30.405 2001-08-15T12:02:14.399 2001-08-20T03:10:23.430 2001-08-20T03:12:33.629 2001-08-21T23:59:56.279 2001-08-22T10:12:37.768 2001-08-22T10:21:21.763 2001-08-22T10:23:41.763 2001-08-31T23:59:58.643