+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103193 (1999 XG243) Classification: Main-belt Asteroid          SPK-ID: 2103193 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1676212488969271 5.5664e-08   a 2.61929447571088 1.1225e-08 au q 2.180245064463401 1.4701e-07 au i 13.24081867258624 3.75e-06 deg node 280.2490358845938 2.5466e-05 deg peri 117.3219555735723 3.2562e-05 deg M 1.284913543774783 1.5463e-05 deg tp 2459194.973549003586 (2020-Dec-11.47354900) 6.652e-05 TDB period 1548.370603102546 4.24 9.9529e-06 2.725e-08 d yr n .2325024766542651 1.4945e-09 deg/d Q 3.058343886958359 1.3106e-08 au   Orbit Determination Parameters    # obs. used (total)      1128      data-arc span      10584 days (28.98 yr)      first obs. used      1992-01-27      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46308      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:37   Additional Information  Earth MOID = 1.22359 au   Jupiter MOID = 2.4092 au   T_jup = 3.348  [ 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 14.74   n/a E2021B55   103193 (1999 XG243)          Discovered 1999-Dec-05 by LONEOS at Anderson Mesa Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-09 01:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin