+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   9355 (1991 XO2) Classification: Main-belt Asteroid          SPK-ID: 2009355 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO236447 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2066963 n/a   a 2.3622699 n/a AU q 1.8739975 n/a AU i 4.41219 n/a deg node 223.48044 n/a deg peri 199.14851 n/a deg M 318.09795 n/a deg tp 2456554.8567018 (2013-Sep-19.35670180) n/a JED period 1326.1502161 3.63 n/a n/a d yr n 0.27146246 n/a deg/d Q 2.8505423 n/a AU   Orbit Determination Parameters    # obs. used (total)      645      first obs. used      1955-??-??      last obs. used      2012-08-11      # oppositions      15      planetary ephem.      DE403      condition code      0      fit RMS      0.60      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.517  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.0 mag n/a PDS3 (MPC 32619)   9355 (1991 XO2)          Discovered 1991-Dec-05 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 19981005/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 XO2 = 1962 WX1 = 1962 XG1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 00:38 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin