+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   30811 (1990 OD2) Classification: Main-belt Asteroid          SPK-ID: 2030811 [ 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 .1850567529404665 6.4076e-08   a 2.270647445081228 2.0635e-08 AU q 1.85044880182193 1.4711e-07 AU i 6.703473074662674 8.7208e-06 deg node 47.52394897536843 5.8054e-05 deg peri 283.6987834418921 6.4633e-05 deg M 221.3325011986194 3.4674e-05 deg tp 2456881.887900728152 (2014-Aug-12.38790073) 0.00012413 JED period 1249.749550255893 3.42 1.7036e-05 4.664e-08 d yr n .2880577151848449 3.9266e-09 deg/d Q 2.690846088340526 2.4453e-08 AU   Orbit Determination Parameters    # obs. used (total)      683      data-arc span      8294 days (22.71 yr)      first obs. used      1990-07-29      last obs. used      2013-04-13      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55648      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:55:56   Additional Information  Earth MOID = .853943 AU   T_jup = 3.581  [ 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 15.1 mag n/a PDS3 (MPO 18546)   30811 (1990 OD2)          Discovered 1990-Jul-29 by Holt, H. E. at Palomar (675) Reference: 20011130/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1990 OD2 = 1997 WD1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 04:22 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin