+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   15283 (1991 RB8) Classification: Main-belt Asteroid          SPK-ID: 2015283 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .122070195926911 4.9444e-08   a 2.238399777817993 1.2406e-08 AU q 1.965157878376997 1.0925e-07 AU i 5.302717718001281 8.3575e-06 deg node 37.44183867065002 6.73e-05 deg peri 58.7693222792936 7.7685e-05 deg M 84.19949924855459 3.8243e-05 deg tp 2456114.403914363993 (2012-Jul-05.90391436) 0.00012943 JED period 1223.220942501395 3.35 1.017e-05 2.784e-08 d yr n .2943049677222063 2.4468e-09 deg/d Q 2.51164167725899 1.3921e-08 AU   Orbit Determination Parameters    # obs. used (total)      973      data-arc span      22421 days (61.39 yr)      first obs. used      1951-12-01      last obs. used      2013-04-20      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .5389      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:58:49   Additional Information  Earth MOID = .987248 AU   T_jup = 3.621  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.9 mag n/a PDS3 (MPO 847)   15283 (1991 RB8)          Discovered 1991-Sep-12 by Holt, H. E. at Palomar (675) Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RB8 = 1969 AJ = 1998 XM66  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 17:34 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin