+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   12731 (1991 RW12) Classification: Main-belt Asteroid          SPK-ID: 2012731 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO233592 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0489540 n/a   a 2.4215524 n/a AU q 2.3030077 n/a AU i 3.73620 n/a deg node 187.92258 n/a deg peri 102.03974 n/a deg M 325.49074 n/a deg tp 2456532.4387568 (2013-Aug-27.93875680) n/a JED period 1376.3828155 3.77 n/a n/a d yr n 0.26155514 n/a deg/d Q 2.5400971 n/a AU   Orbit Determination Parameters    # obs. used (total)      1110      first obs. used      1953-??-??      last obs. used      2012-06-08      # oppositions      13      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.509  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.0 mag n/a PDS3 (MPC 37046)   12731 (1991 RW12)          Discovered 1991-Sep-10 by Holt, H. E. at Palomar (675) Reference: 19991222/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RW12 = 1953 PK1 = 1976 SO9 = 1998 MG26  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 17:25 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin