PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 54 FILE_RECORDS = 4665 ^POLE_RA_TABLE = ("LANDMARK.TAB",1) ^POLE_DEC_TABLE = ("LANDMARK.TAB",2) ^ROTATION_TABLE = ("LANDMARK.TAB",3) ^LANDMARK_TABLE = ("LANDMARK.TAB",4) INSTRUMENT_HOST_NAME = "NEAR EARTH ASTEROID RENDEZVOUS" TARGET_NAME = "EROS" INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" DATA_SET_ID = "NEAR-A-RSS-5-EROS/GRAVITY-V1.0" PRODUCT_ID = "LANDMARK.TAB" PRODUCT_RELEASE_DATE = 2001-07-31 DESCRIPTION = "This file contains Eros pole, spin, and landmark data derived during the gravity field solution by the NEAR Radio Science Team. The orientation of Eros is specified by the IAU right ascension and declination system; for example, see M.E. Davies et al., Celes. Mech. and Dyn. Astron. 63, 127-148, 1996. The Eros prime meridian (the IAU W) is not solved for but fixed to the value 326.08 degrees." START_TIME = 2000-02-14T16:00:00Z STOP_TIME = 2001-02-12T15:15:00Z SOFTWARE_NAME = "SHAGRV.V1.0" PRODUCT_CREATION_TIME = 2001-05-09T00:00:00Z PRODUCER_ID = "NEAR RADIO SCIENCE" OBJECT = POLE_RA_TABLE ROWS = 1 COLUMNS = 3 ROW_BYTES = 54 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The Pole Right Ascension Table contains a single row giving the right ascension of the Eros rotation axis and its formal uncertainty. This pole value is the mean value over the duration of the NEAR mission. The actual pole value may change by 0.01 degrees due to the solar gravity gradient torque on Eros. The actual uncertainty in this pole value is perhaps 10 times the formal uncertainty given. The row contains 52 printable ASCII characters followed by an ASCII carriage-return line-feed pair, making the total line length equal to 54 bytes." OBJECT = COLUMN NAME = "PARAMETER NAME" COLUMN_NUMBER = 1 DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 13 UNIT = "N/A" DESCRIPTION = "The name of the solution parameter representing the Eros rotation axis right ascension." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "VALUE" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 18 UNIT = "DEGREE" DESCRIPTION = "The right ascension of the Eros rotation axis." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 35 BYTES = 18 UNIT = "DEGREE" DESCRIPTION = "The uncertainty in the right ascension of the Eros rotation axis." END_OBJECT = COLUMN END_OBJECT = POLE_RA_TABLE OBJECT = POLE_DEC_TABLE ROWS = 1 COLUMNS = 3 ROW_BYTES = 54 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The Pole Declination Table contains a single row giving the declination of the Eros rotation axis and its formal uncertainty. This pole value is the mean value over the duration of the NEAR mission. The actual pole value may change by 0.01 degrees due to the solar gravity gradient torque on Eros. The actual uncertainty in this pole value is perhaps 10 times the formal uncertainty given. The row contains 52 printable ASCII characters followed by an ASCII carriage-return line-feed pair, making the total line length equal to 54 bytes." OBJECT = COLUMN NAME = "PARAMETER NAME" COLUMN_NUMBER = 1 DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 13 UNIT = "N/A" DESCRIPTION = "The name of the solution parameter representing the Eros rotation axis declination." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "VALUE" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 18 UNIT = "DEGREE" DESCRIPTION = "The declination of the Eros rotation axis." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 35 BYTES = 18 UNIT = "DEGREE" DESCRIPTION = "The uncertainty in the declination of the Eros rotation axis." END_OBJECT = COLUMN END_OBJECT = POLE_DEC_TABLE OBJECT = ROTATION_TABLE ROWS = 1 COLUMNS = 3 ROW_BYTES = 54 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The Rotation Table contains a single row giving the rate of Eros rotation and its formal uncertainty. The actual uncetainty for the rotation rate is about 3 times the formal uncertainty. The row contains 52 printable ASCII characters followed by an ASCII carriage-return line-feed pair, making the total line length equal to 54 bytes." OBJECT = COLUMN NAME = "PARAMETER NAME" COLUMN_NUMBER = 1 DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 13 UNIT = "N/A" DESCRIPTION = "The name of the solution parameter representing the Eros rotation rate." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "VALUE" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 18 UNIT = "DEGREE PER DAY" DESCRIPTION = "The rotation rate of Eros." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 35 BYTES = 18 UNIT = "DEGREE PER DAY" DESCRIPTION = "The uncertainty in the rotation rate of Eros." END_OBJECT = COLUMN END_OBJECT = ROTATION_TABLE OBJECT = LANDMARK_TABLE ROWS = 4662 COLUMNS = 3 ROW_BYTES = 54 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The Landmark Table contains multiples rows giving landmark names, position values, and formal uncertainties. A landmark is a crater that is visible is an image from the NEAR camera. The location is defined to be the center of the crater on a plane that lies on top of the rim of the crater. So the landmark position is not on the actual surface of the asteroid but is projected upward by the depth of the crater. The landmarks are classified by letters A to I. Each letter classification is chronological, i.e. landmarks A were chosen at the beginning of the mission and landmarks I were the last to be chosen. Some details on the classification of the landmarks from Bill Owen of the NEAR navigation team follow: A => early approach, large craters on north side -- starting Feb 3, 2000 B => started when we first exceeded the magic number 27 (a preliminary software maximum in the PCODP) ... generally smaller than A, but still northern hemisphere since this was still on approach -- starting Feb 12, 2000. I wound up adding a handful of B series landmarks much later in the game, because a) they were in the north and b) there were more Ds than Bs and I didn't want to burden the filter with any more Ds. C => first rotation movie after insertion (Feb 16)... equatorial and slightly north, but mostly equatorial. Some of the northern landmarks were visible in this movie, but since they were foreshortened and seen from an entirely new perspective, it wasn't always obvious what they were. This took 2 days to do, working maybe 12-14 hours per day. There are all sizes in the C series -- you can't NOT take the really big ones, and when you find a really nice small one you've got to take some neighboring ones so you can find it again. D => smaller northern hemisphere landmarks after we'd gone down to 200 km (Mar 2). E => smaller equatorial landmarks (Mar 16), also at 200 km F => our first systematic survey of the south side (Apr 4-5), during the first periapse passage at 100 km. We still didn't get all of it, since a lot was still in shadow. G => VERY small northern landmarks from that same periapse passage. Most of these wound up disappearing into the shadows, and in hindsight we wasted a lot of time on them. H and I => landmarks of all sizes in the `deep South' that were not visible in April, from a systematic observing campaign from 100 km on June 27. There were four sets of mosaics; H came from the first set, which covered about half of the asteroid, and I came from the other three sets. As it turned out, there was a lot of overlap, and there were a few areas that didn't get covered. Each row contains 52 printable ASCII characters followed by an ASCII carriage-return line-feed pair, making the total line length equal to 54 bytes. " OBJECT = COLUMN NAME = "PARAMETER NAME" COLUMN_NUMBER = 1 DATA_TYPE = CHARACTER START_BYTE = 2 BYTES = 13 UNIT = "N/A" DESCRIPTION = "The name assigned to the landmark is [A-I]xxxx[X-Z] where [A-I] is the classification of the landmark, xxxx is the number of the landmark for that classification, and [X-Z] is the body- fixed coordinate for which the position is given. So each landmark has three rows in the table - one for X, Y, and Z." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "VALUE" COLUMN_NUMBER = 2 DATA_TYPE = ASCII_REAL START_BYTE = 16 BYTES = 18 UNIT = "KILOMETER" DESCRIPTION = "The X, Y or Z body-fixed landmark position." END_OBJECT = COLUMN OBJECT = COLUMN NAME = "SIGMA" COLUMN_NUMBER = 3 DATA_TYPE = ASCII_REAL START_BYTE = 35 BYTES = 18 UNIT = "KILOMETER" DESCRIPTION = "The uncertainty in the X, Y or Z body-fixed landmark position." END_OBJECT = COLUMN END_OBJECT = LANDMARK_TABLE END