+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   19958 (1985 RN4) Classification: Mars-crossing Asteroid          SPK-ID: 2019958 [ 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 .3124482551357527 9.1832e-08   a 2.378775832861834 1.2117e-08 AU q 1.635531474525057 2.178e-07 AU i 2.395487360317532 8.4054e-06 deg node 53.25848419103485 0.00020481 deg peri 288.6074003457459 0.00020499 deg M 193.5469697975073 1.3239e-05 deg tp 2457020.109272327158 (2014-Dec-28.60927233) 5.244e-05 JED period 1340.073759945504 3.67 1.0239e-05 2.803e-08 d yr n .2686419290939924 2.0525e-09 deg/d Q 3.122020191198612 1.5902e-08 AU   Orbit Determination Parameters    # obs. used (total)      313      data-arc span      10071 days (27.57 yr)      first obs. used      1985-09-11      last obs. used      2013-04-08      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .56684      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:24:37   Additional Information  Earth MOID = .629146 AU   T_jup = 3.471  [ 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 16.4 mag n/a PDS3 (MPO 7684)   19958 (1985 RN4)          Discovered 1985-Sep-11 by Debehogne, H. at La Silla (809) Reference: 20010109/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1985 RN4 = 1996 TO38  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 18:29 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin