SSO/WISE Associations File (February 10, 2010) [sso04 WSDC D-I148, vsn 1.7 Interface Name: SSO/WISE Associations Type of Interface: table file Written By: SSOID (ssoid, ssothmod)__________________ J. Fowler Read By: SSOID (ssothmod)_________________________ J. Fowler DBPREP___________________________________ T. Evans QA_______________________________________ H. Brandenburg QA_______________________________________ D. Kirkpatrick This file is produced by the ops pipeline for each frameset in a science scan by the SSOID module ssoid. It may also be generated offline by the ssothmod module when it is desired to recompute the thermal-model parameters, in which case another header line will be added at the top that resembles the one shown below but will refer to ssothmod. Table Header Information: NPrd: No. of predicted SSOs in the frame Nps: No. of WISE sources in the frame NMch: No. of matched pairs of SSOs and WISE sources Nmiss: No. of unmatched SSOs Ncnfzd: No. of confused matches (more than one WISE source per SSO) ObsEpoch: Observation epoch in JD OrbEpoch: Epoch of osculating elements in JD Sample Header: \ SSOID Vsn 1.58 A90501 run on 1-05-09 at 11:53:42 \Nprd = 64 \Nps = 8866 \Nmch = 50 \Nmiss = 14 \Ncnfzd = 20 \ObsEpoch = 2455159.827222 \OrbEpoch = 2454800.500000 | IDNum|W1nois|W2nois|W3nois|W4nois|MConf|N| dRA | dDec| RA | Dec | ObjID |T| RHelio | RTopo | Phase | VMag | Mu |Theta| EMj|EMn|ErAng| PerDist | Ecc | Incl | PV1 | PV2 | PV3 | QV1 | QV2 | QV3 | PerTime | Err| Amag|Slope|w1mpro|w1sgmp|w2mpro|w2sgmp|w3mpro|w3sgmp|w4mpro|w4sgmp| Bond|SgBnd| Diam |SigDm| Beam|SgBem| Tss |SgTss| scan |frame| ObsEpoch | | int | real | real | real | real | real|i| real| real| real | real | char |c| real | real | real | real | real | real| r | r | real| real | real | real | real | real | real | real | real | real | real |real| real| real| real | real | real | real | real | real | real | real | real| real| real | real| real| real| real | real| char | int | real | | | DN | DN | DN | DN | | | asec| asec| deg | deg | | | AU | AU | deg | mag | asec/s| deg |asec| as| deg | AU | | deg | | | | | | | JD | | mag | | mag | mag | mag | mag | mag | mag | mag | mag | | | km | km | | | k | k | | | JD | | null | null | null | null | null | null| | null| null| null | null | null |-| null | null | null | null | null | null|null|nul| null| null | null | null | null | null | null | null | null | null | null |null| null| null| null | null | null | null | null | null | null | null | null| null| null | null| null| null| null | null| null | null| null | Description of Columns: Cols Name Description Units Type Format ------- ------ ------------------------------------- ------- ---- -------- 1-7 IDNum WISE point-source ID no. in frame [1] - I*4 I7 8-14 W1nois Noise in W1 [2] DN R*4 F7.2 15-21 W2nois Noise in W2 [2] DN R*4 F7.2 22-28 W3nois Noise in W3 [2] DN R*4 F7.2 29-35 W4nois Noise in W4 [2] DN R*4 F7.2 36-41 MConf Match confidence parameter [3] - R*4 F6.2 42-43 N No. of WISE point sources within - I*4 I2 association threshold (max 9) [1] 44-49 dRA RA discrepancy (WISE - SSO) arcsec R*4 F6.1 50-55 dDec Dec discrepancy (WISE - SSO) arcsec R*4 F6.1 56-66 RA Right Ascension (predicted) deg R*8 F11.6 67-77 Dec Declination (predicted) deg R*8 F11.6 78-113 ObjID Object ID field - C*35 1x,A35 114-115 T Type of object [8] - C*1 1x,A1 116-125 RHelio Heliocentric distance AU R*8 F10.5 126-135 RTopo Topocentric (spacecraft) distance AU R*8 F10.5 136-143 Phase Phase angle deg R*8 F8.3 144-150 VMag Visual magnitude mag R*8 F7.3 151-158 Mu Proper motion arcsec/s R*8 F8.3 159-164 Theta Direction of proper motion (E of N) deg R*8 F6.1 165-169 EMj Semimajor axis of error ellipse arcsec R*8 F5.1 170-173 EMn Semiminor axis of error ellipse arcsec R*8 F4.1 174-179 ErAng Direction of EMj axis (E of N) deg R*8 F6.1 180-190 PerDist Perihelion distance AU R*8 F11.7 191-200 Ecc Orbital eccentricity - R*8 F10.7 201-213 Incl Orbital inclination deg R*8 F13.8 214-225 PV1 P vector X component [4] - R*8 F12.8 226-237 PV2 P vector Y component [4] - R*8 F12.8 238-249 PV3 P vector Z component [4] - R*8 F12.8 250-261 QV1 Q vector X component [5] - R*8 F12.8 262-273 QV2 Q vector Y component [5] - R*8 F12.8 274-285 QV3 Q vector Z component [5] - R*8 F12.8 286-299 PerTime Perihelion passage time JD R*8 F14.5 300-304 Err Orbital element quality estimate - R*8 F5.1 305-310 Amag Absolute magnitude mag R*8 F6.2 311-316 Slope Slope parameter [6] - R*4 F6.2 317-323 w1mpro WISE source W1 magnitude mag R*4 F7.3 324-330 w1sgmp WISE source W1 magnitude uncertainty mag R*4 F7.3 331-337 w2mpro WISE source W2 magnitude mag R*4 F7.3 338-344 w2sgmp WISE source W2 magnitude uncertainty mag R*4 F7.3 345-351 w3mpro WISE source W3 magnitude mag R*4 F7.3 352-358 w3sgmp WISE source W3 magnitude uncertainty mag R*4 F7.3 359-365 w4mpro WISE source W4 magnitude mag R*4 F7.3 366-372 w4sgmp WISE source W4 magnitude uncertainty mag R*4 F7.3 373-378 Bond Bond albedo - R*4 F6.3 379-384 SgBnd Bond albedo uncertainty - R*4 F6.3 385-392 Diam Diameter km R*4 F8.2 393-398 SigDm Diameter uncertainty km R*4 F6.2 399-404 Beam Beaming parameter - R*4 F6.3 405-410 SgBem Beaming parameter uncertainty - R*4 F6.3 411-418 Tss Sub-Solar Temperature k R*4 F8.2 419-424 SgTss Sub-Solar Temperature uncertainty k R*4 F6.2 425-431 ScanID Scan ID - C*6 1x,A6 432-437 FrmID Frame ID - I*4 3x,I3 438-455 ObsEpoch Epoch of observation (frame) JD R*8 F18.9 Notes: 1.) IDNum = null and N = 0 indicate that no association was made; N will be clipped at 9 if necessary in order to prevent field overflow. 2.) The noise values are those from the WISE source file if an association was made, otherwise they are the average noise values for the frame, averaged over all input WISE sources. 3.) MConf is a 2-D chi-square parameter; it will be clipped on the high side at 99.99 if necessary; it will be "null" if no association was made. 4.) The P vector is the unit vector from the Sun toward perihelion in J2000. 5.) The Q unit vector is orthogonal to the P vector in the orbital plane, right-handed about the orbital angular momentum vector. 6.) The slope parameter is used in computing the phase-dependent term in the visual magnitude using the asteroid phase function developed by Bowell, Harris, and Lumme 7.) All uncertainties are 1-sigma values 8.) Object types are indicated by one-character codes as follows: A Asteroid (numbered) U Unnumbered asteroid C Periodic Comet N Non-Periodic Comet P Planet S Satellite of Planet X Unknown Type identifiers are associated with the SSOs in the Orbital Elements File (SIS sso01, WSDC-I145) via the ssoidin namelist input to the ssoid module and the ssoinin namelist input to the ssoinit module (SSOID SDS, WSDC D-D017, sections 2.2.6 and 2.1.4, respectively). The relevant variables in both namelists are the arrays NamType(50) and NType(50), which allow up to 50 different 1-character Type IDs to be used. They operate as follows: suppose the first 250,000 SSOs in the Orbital Elements File are numbered asteroids, the next 190,000 are unnumbered asteroids, the next 500 are periodic comets, the next 2500 are non-periodic comets, and the next 8 are planets; then these arrays would have the following values: NamType(1) = 'A', NType(1) = 250000, NamType(2) = 'U', NType(2) = 190000, NamType(3) = 'C', NType(3) = 500, NamType(4) = 'N', NType(4) = 2500 NamType(5) = 'P', NType(5) = 8, NamType(6) = 'X', NType(6) = 999999, where the last Type ("X") need not correspond to actual entries in the file. The Type ID "S" is assigned independently by the ssoid module in the code section dedicated to processing Planetary Satellites. The ssoidin namelist has an additional parameter, TypeDesc, that gives full names for the types; these are used in the meta-data output (SIS sso05). The current values are: TypeDesc(1) = 'numbered Asteroids', TypeDesc(2) = 'Unnumbered asteroids', TypeDesc(3) = 'periodic Comets', TypeDesc(4) = 'Non-periodic comets', TypeDesc(5) = 'Planets', TypeDesc(6) = 'Unknown'