+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   102956 (1999 XH61) Classification: Main-belt Asteroid          SPK-ID: 2102956 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 18 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1246662829596701 2.8451e-08   a 2.574574026068084 1.0624e-08 au q 2.253611452033664 7.3031e-08 au i 2.711522621852791 4.2637e-06 deg node 200.8986000791421 8.4655e-05 deg peri 243.2904790346856 8.7679e-05 deg M 22.81639782496796 2.1758e-05 deg tp 2459104.868474877853 (2020-Sep-12.36847488) 9.1112e-05 TDB period 1508.886254003652 4.13 9.3398e-06 2.557e-08 d yr n .2385865727418368 1.4768e-09 deg/d Q 2.895536600102505 1.1949e-08 au   Orbit Determination Parameters    # obs. used (total)      885      data-arc span      7738 days (21.19 yr)      first obs. used      1999-11-15      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50612      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:32:51   Additional Information  Earth MOID = 1.27088 au   Jupiter MOID = 2.30791 au   T_jup = 3.415  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.6   n/a MPO264067   102956 (1999 XH61)          Discovered 1999-Dec-07 by LINEAR at Socorro Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-28 20:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin