PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT PUBLICATION_DATE = 2004-11-01 NOTE = "ERRATA.TXT is an ASCII text file that documents all of the known errors or variances associated with the PDS archive of the Lunar Prospector Magnetometer/Electron Reflectometer processed data, including Level 1B (CODMAC Level 4) and High-Level (Levels 2-4, CODMAC Levels 4-5) data. All volumes in these two sets are included in this list. An updated version of this file is maintained online at the Planetary Plasma Interactions Node of the Planetary Data System. The online errata list can be found on the World Wide Web at http://www.igpp.ucla.edu/public/pds/ERRATA/LP/ERRATA.TXT." END_OBJECT = TEXT END Cumulative errata for the LP_120x volume series: Volume Error/Variance Description ------------------------------------------------------------------------- LP_120x Many of the documents provided to the PDS by the LP project were available only in PDF format. Resources were not available to convert these documents to an ASCII text form. Thus, several of the documents on this volume series are at variance with the PDS standard that requires an ASCII text version of each archive document. These disks contains some Level 0 data (attitude, ephemeris, sunpulse, and command files). A partial summary of errata for the Level 0 data has been included at the end of this file. LP_2001 The data on volume LP_2001 belong to three distinct levels of processing. Throughout most of the documentation and labels on the disk, and in directory names, these levels are referred to as Levels 2, 3, and 4. However according to the CODMAC standard of data processing levels used by the PDS, these data belong to CODMAC levels 4 and 5. These CODMAC levels are used in the DATASET_IDs for the datasets and are mentioned in documentation files when necessary. The version of LP_2001 that currently is online lacks a dataset catalog file for Level 2 ER data. This will be made publicly available as soon as it is obtained by PDS PPI. The columns in the Level 2 MAG data are described incorrectly in the label files (*.LBL). The correct order of columns is: B_east, B_north, B_radial, B_xsg, B_ysg, B_zsg, latitude, longitude, approx. altitude. This will be corrected in future releases of the disk. ========================================================================= SUMMARY OF ERRATA FOR LEVEL 0 DATA These Level 0 errata pertain to the Level 0 Lunar Prospector dataset, which was archived on PDS volumes LP_0001 - LP_0019 by the Geosciences Node of the PDS. The citation for that dataset is as follows: Binder, A.B., W.C. Feldman, A.S. Konopliv, R.P. Lin, M.H. Acuna, L.L. Hood, and E.A. Guinness, Lunar Prospector level 0 data archive, NASA Planetary Data System, LP-L-ENG/GRS/NS/APS/MAG/ER-1-MDR-V1.0, 1998. The summary given here was adapted, with changes, from the ERRATA.TXT file on the volume LP_0019, which we acknowledge as the source. This summary contains only those Level 0 errata that appeared to have potential relevance to the Level 1B or higher PDS data volumes. I. COMMENTS FOR ALL VOLUMES (LP_1201, LP_1202, LP_1203, LP_1204) 1. PDS catalog objects Some of the Level 0 catalog objects on this volume are somewhat brief. This is because at the time that the original Level 0 archive was released, published papers about the instruments were not available. 2. Uplink command files Occasionally a given command is listed twice by the software that generates the command files. This can be detected because the two commands are identical (same command and same transmit time). However, these duplicate commands were only transmitted once to the spacecraft. 3. Spacecraft clock The LP spacecraft clock or frame counter increments once every 2 seconds. It is stored in a 24-bit register. This means that the clock will reset to zero after about 33.5 million seconds or about one year. The LP spacecraft clock reset on January 30, 1999 at about 12:09 UTC, which was early in the Extended Mission. Level 0 data files containing the reset clock counter are found on volumes LP_0013 and above. 4. ATTITUDE.TAB file Attitude determinations from 1/7/98 through 1/15/98 are based on Sun sensor data only. Determinations starting on 1/16/98 are based on a combination of Sun sensor data, Earth-Moon limb sensor data, and the definitive ephemeris. Attitude determinations from 3/1/98 through 3/3/98 are based on a combination of Sun sensor and Earth-Moon limb sensor data. Determinations from 3/4/98 through 3/31/98 are based only on Sun sensor data due to poor Earth-Moon limb sensor geometry Attitude determinations from 4/1/98 through 4/12/98 and for 4/16/98 are based only on Sun sensor data due to poor Earth-Moon limb sensor geometry. Determinations for other times in April 1998 are based on a combination of Sun sensor and Earth-Moon limb sensor data. Attitude determinations from 5/3/98 through 4/9/98 are based only on Sun sensor data because of Earth interference with the Earth-Moon limb sensor. Also determinations for 5/31/98 are based only on Sun sensor data due to poor Earth-Moon limb sensor geometry. Determinations for other times in May 1998 are based on a combination of Sun sensor and Earth-Moon limb sensor data. Attitude determinations from 6/1/98 through 8/31/98 are based only on Sun sensor data due to poor Earth-Moon limb sensor geometry. Attitude determinations from 9/1/98 through 7/31/99 are based only on Sun sensor data. II. COMMENTS FOR VOLUME LP_1201 1. Uplink command files In command file C9802342.TAB, the MERHTROFF command transmitted at 1998-01-23T00:49:53 did not execute on the spacecraft because the command format was incorrect due to a configuration error in the command system at the Mission Control Center. The commands listed in file C9811346.TAB did not reach the spacecraft due to a configuration error in the command system. 2. File names for sun pulse files PDS file names for the sun pulse files are based on the date and hour for the start of the file. There are two sun pulse files that began in the same hour (hour 19 of 3/20/98). To avoid having files with the same name, the start hour used for one set was 19, whereas hour 20 was used for the second set. The files involved are: S9807919.B S9807920.B 3. Revised format for MAG/ER data starting with volume LP_0005 (NOTE: This comment pertains to the Level 0 MAG/ER data, not to the more highly processed MAG/ER data included on the LP_12* and LP_2* volumes:) On May 14, 1998, commands were sent to the Lunar Prospector spacecraft to reprogram onboard data processing and formatting in the MAG/ER instrument. The new data format is described in the MAGERFMT.PDF file found in the DOCUMENT directory. This file is a revision of Appendix G (LP MAG/ER Telemetry Format) of the Level 0 Data Product SIS document found in the LVL0SIS.PDF file. III. COMMENTS FOR VOLUME LP_1202 1. Uplink command file C9815961.TAB In command file C9815961.TAB, the command "GHV1LEV, 206" was transmitted multiple times due to a command system configuration error at the mission control center. The command was transmitted three times incorrectly (and one of those commands is duplicated in the command file). The command system was reconfigured and the command transmitted at 20:46:24.7 was accepted by the spacecraft. 2. Uplink command files C9826116.TAB, C9826746.TAB, and C9827027.TAB Several command files on volume LP_0009 contain commands that were not received by the spacecraft. In C9826116.TAB the spacecraft did not receive the two pairs of XMTON and EXEC commands between 15:05:00 and 15:10:11 because the DSS antenna was not pointing at the spacecraft. In C9826746.TAB the XMTON and EXEC commands between 06:24:00 and 06:24:02 and 08:22:00 and 08:22:02 were not received by the spacecraft because of a DSS problem. In C9827027.TAB the spacecraft did not receive two pairs of XMTON and EXEC commands between 03:10:00 and 03:15:28 because of an uplink failure at the station. 3. Sun pulse file S9823322.B This file covers the time period of 1998-08-21T22:21 to 1998-08-23T03:12 UTC. The spacecraft was in eclipse during this time. IV. COMMENTS FOR VOLUME LP_1203 1. Uplink command files C9830542.TAB, and C9830642.TAB Two command files on volume LP_0011 contain commands that were not properly executed by the spacecraft. In C9830542.TAB the first 4 commands between 11:10:17 and 12:00:34 were delayed because of a command system failure. In C9830642.TAB the six commands between 09:36:00 and 09:55:50 did not work. 2. Uplink command file C9903146.TAB This command file on volume LP_0013 contains two commands that were not properly received by the spacecraft. The two commands between 16:53:39 and 16:53:41 did not get into the spacecraft. 3. Uplink command files In command file C9906146.TAB, the spacecraft received only the last four commands because the DSS had wrong settings. In command file C9906316.TAB, the spacecraft did not receive the first two commands. In command file C9908066.TAB, commands three through six were not received by the spacecraft. In command file C9908916.TAB, the spacecraft did not accept the command at 1999-03-30T04:36:23.500. 4. Sun pulse file S9902903.B This file covers the time period of 1999-01-29T03:16 to 1999-01-29T08:51 UTC. The spacecraft was in eclipse during this time. 5. Sun pulse file S9905611.B This file covers the time period of 1999-02-25T11:37 to 1999-02-25T15:40 UTC. The spacecraft was in eclipse during this time. V. COMMENTS FOR VOLUME LP_1204 1. Uplink command files In command file C9914966.TAB, the commands at 21:11:02.000 and 21:14:22.200 were executed on the spacecraft. In command file C9915066.TAB, the first four commands did not get into the spacecraft. 2. Uplink command file In command file C9918146.TAB, the commands between 14:35:15.000 and 14:37:20.600 were resent to the spacecraft to allow verification of each command. When these commands were resent between 14:40:22.900 and 14:51:29.000 they were not properly confirmed by the spacecraft. The sequence of commands were correctly received and confirmed by the spacecraft when they were sent a third time starting at 14:58:33.800. 3. Sun pulse files Sun pulse data are only valid when the spacecraft spin rate is less than 15 rpm. During the final phase of the mission in preparation for the spacecraft impact, the spin rate was increased to about 24 rpm. Therefore, there are no sun pulse data for this high spin rate period, which started on 7/29/99 and continued until the end of mission on 7/31/99. 4. Position file P99212.DAT on volume LP_0019 The height above the surface parameter (HGT) is invalid for times between 9:21 and 10:10 (end of file) for the position file P99212.DAT. This is during the final descent to impact into the surface. The HGT values appear to be relative to a sphere with radius of 1500 km for this time period as opposed to the nominal lunar radius value of 1738 km. 5. Ephemeris and position files Some of these files contain data for most of the cruise and orbit insertion phases. However, there are gaps in the data around the times of spacecraft maneuvers. In addition, the time sampling for position file P98009.DAT is once an hour instead of the normal once a minute sampling.