+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   103157 (1999 XU223) Classification: Main-belt Asteroid          SPK-ID: 2103157 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1406547973519874 5.2568e-08   a 2.640485130830277 1.4497e-08 au q 2.269088229842409 1.457e-07 au i 8.531187886745988 4.8626e-06 deg node 282.146177389834 3.5243e-05 deg peri 165.065493636946 4.1406e-05 deg M 332.8901805755187 1.956e-05 deg tp 2459318.517970018676 (2021-Apr-14.01797002) 8.5214e-05 TDB period 1567.198532069757 4.29 1.2906e-05 3.533e-08 d yr n .2297092503810336 1.8917e-09 deg/d Q 3.011882031818146 1.6536e-08 au   Orbit Determination Parameters    # obs. used (total)      646      data-arc span      7735 days (21.18 yr)      first obs. used      1999-11-16      last obs. used      2021-01-19      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50891      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:33:29   Additional Information  Earth MOID = 1.28641 au   Jupiter MOID = 2.18854 au   T_jup = 3.366  [ 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 15.46   n/a E2021B55   103157 (1999 XU223)          Discovered 1999-Dec-13 by Spacewatch at Kitt Peak Reference: 20051019/Numbers.arc Last Updated: 2005-10-26 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Mar-04 22:57 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin