Data Set Information
DATA_SET_NAME IRAS MINOR PLANET SURVEY ASTEROIDS V4.0
DATA_SET_ID IRAS-A-FPA-3-RDR-IMPS-V4.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : The data presented with this data set include: 1) SIGHTING.TAB - contains a listing of 8210 individual sightings associated with 2004 asteroids. SIGHTING.TAB contains the observation index, the identification of asteroids sighted, information pertaining to observation times, positional information on the observations of asteroids detected, geometric albedos, diameters and their associated uncertainties, input values used in the calculations of the geometric albedos and diameters using the asteroid standard thermal model, the observed flux densities in each band, detector crossing information, correlation coefficients, and status flags for reduction steps. 2) DIAMALB.TAB - contains averaged radiometric diameters and geometric albedos derived from individual observations for 1796 numbered asteroids and 88 unnumbered asteroids (as of 1983) whose orbital elements were determined using astrometry from two or more apparitions. 3) SINGLE.TAB - contains an entry for each of 120 asteroids for which there is an accepted sighting, but in one band only. This file includes the absolute visual magnitude of the asteroid, the albedo and diameter derived from the measurement and their associated uncertainties, and the accepted status word. 4) GRNDDAT.TAB - contains entries for each of 4677 numbered asteroids and 2632 unnumbered asteroids (as of 1985) for which associations were sought in the IRAS data. Asteroids 719 Albert and 878 Mildred were still lost as of 1985 and are not included. These entries include an initial estimate of geometric albedo and diameter used in processing IRAS survey observations of asteroids, the adopted taxonomic classification, and the orbital elements at three epochs. The Julian dates of the epochs are 2445400.5, 2445500.5, and 2445600.5. For further information regarding these data see Tedesco, et. al., 1992 [TEDESCOETAL1992]. 5) IMPSSTAT.TAB - contains a summary of the number of times each asteroid was predicted to be scanned, and possible reasons for any failure to be detected. It contains entries for each of 4677 numbered asteroids and 2632 unnumbered asteroids (as of 1985) for which associations were sought in the IRAS data. Asteroids 719 Albert and 878 Mildred were still lost as of 1985 and are not included. These entries include the number of predicted sightings, number of accepted sightings, number of rejected sightings, number of missed predicted sightings, number of missed predicted faint sightings, number of dead 25 micron detector non-detections, number of noisy 25 micron detector non-detections, number of missed predictions in the galactic center region, and other non-detections. 6) REJECT.TAB - summarizes the number of rejected sightings for each asteroid and possible reasons for rejection. 7) MISSED.TAB - contains a summary of those asteroids which were predicted to pass across the IRAS focal plane during survey mode, but which generated no accepted associations. Entries include the number of times an asteroid was predicted to be scanned but was missed, and the derived greatest lower limit on the albedo and least upper limit on the diameter, plus a status word detailing the circumstances of the observation failure. 8) STMODEL.TAB - contains the flux look-up table used to generate the IMPS albedos. This table was provided by L. Lebofsky and was derived from the IRAS standard thermal model. Modification History -------------------- The IMPS data set was ingested in 1994 and updated to correct a minor error in 1995. These versions included only FP102, the diameters and albedos. The data set has now been updated to include FP103, FP104, FP105, FP 106, FP107, FP108, and the flux lookup table used tto generate the IMPS albedos.
DATA_SET_RELEASE_DATE 1998-03-23T00:00:00.000Z
START_TIME 1983-01-01T12:00:00.000Z
STOP_TIME 1983-11-01T12:00:00.000Z
MISSION_NAME INFRARED ASTRONOMICAL SATELLITE
MISSION_START_DATE 1983-01-26T12:00:00.000Z
MISSION_STOP_DATE 1983-11-23T12:00:00.000Z
TARGET_NAME ASTEROID
TARGET_TYPE ASTEROID
INSTRUMENT_HOST_ID IRAS
INSTRUMENT_NAME FOCAL PLANE ARRAY
INSTRUMENT_ID FPA
INSTRUMENT_TYPE CAMERA
NODE_NAME Small Bodies
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE Review : This data set underwent peer review on March 23, 1998.
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT The data presented with this data set include: (a) 8210 individual sightings associated with 2004 asteroids, (b) averaged radiometric diameters and geometric albedos derived from individual observations for 1796 numbered asteroids and 88 unnumbered asteroids (as of 1983) whose orbital elements were determined using astrometry from two or more apparitions; (c) an entry for each of 120 asteroids for which there is an accepted sighting; (d) entries for each of 4677 numbered asteroids and 2632 unnumbered asteroids (as of 1985) for which associations were sought in the IRAS data; (e) A summary of the number of times each asteroid was predicted to be scanned, and possible reasons for any failure to be detected.
PRODUCER_FULL_NAME MARK SYKES
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