+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   13919 (1984 SO4) Classification: Main-belt Asteroid          SPK-ID: 2013919 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256967 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1180227 n/a   a 2.2764984 n/a AU q 2.0078199 n/a AU i 4.97784 n/a deg node 286.42577 n/a deg peri 55.18923 n/a deg M 135.25365 n/a deg tp 2455929.1473607 (2012-Jan-02.64736070) n/a JED period 1254.5831491 3.43 n/a n/a d yr n 0.28694790 n/a deg/d Q 2.5451769 n/a AU   Orbit Determination Parameters    # obs. used (total)      801      first obs. used      1984-??-??      last obs. used      2013-03-03      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.594  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2 mag n/a PDS3 (MPC 39028)   13919 (1984 SO4)          Discovered 1984-Sep-21 by Debehogne, H. at La Silla (809) Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-20 06:23 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin