+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   15286 (1991 RJ22) Classification: Main-belt Asteroid          SPK-ID: 2015286 [ 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 .2109749580175518 8.8072e-08   a 2.14543126568579 1.369e-08 AU q 1.692798994478187 1.8614e-07 AU i 4.481734322553476 6.1055e-06 deg node 120.5393290769201 0.00010979 deg peri 214.6367804747489 0.0001125 deg M 322.9006327780477 2.8138e-05 deg tp 2456518.786269800305 (2013-Aug-14.28626980) 9.0213e-05 JED period 1147.810874329762 3.14 1.0987e-05 3.008e-08 d yr n .3136405204474247 3.0021e-09 deg/d Q 2.598063536893392 1.6579e-08 AU   Orbit Determination Parameters    # obs. used (total)      961      data-arc span      7913 days (21.66 yr)      first obs. used      1991-08-07      last obs. used      2013-04-06      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55404      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:58:49   Additional Information  Earth MOID = .684749 AU   T_jup = 3.677  [ 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 14.0 mag n/a PDS3 (MPO 848)   15286 (1991 RJ22)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar (675) Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RJ22 = 1969 RE2 = 1995 WK42  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 15:42 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin