+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   47322 (1999 XS21) Classification: Main-belt Asteroid          SPK-ID: 2047322 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09754820315644783 3.0343e-08   a 2.344692478907392 6.8883e-09 au q 2.115971940635538 7.0322e-08 au i 9.247638105925049 4.6115e-06 deg node 189.3977409000657 1.7673e-05 deg peri 106.6495541712 2.9641e-05 deg M 16.65907581043641 2.339e-05 deg tp 2458939.815795087901 (2020-Mar-31.31579509) 8.5201e-05 TDB period 1311.37609414501 3.59 5.7789e-06 1.582e-08 d yr n .2745207889691725 1.2097e-09 deg/d Q 2.573413017179246 7.5602e-09 au   Orbit Determination Parameters    # obs. used (total)      1322      data-arc span      9212 days (25.22 yr)      first obs. used      1995-08-22      last obs. used      2020-11-10      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52732      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:48:41   Additional Information  Earth MOID = 1.12284 au   Jupiter MOID = 2.59686 au   T_jup = 3.538  [ 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 15.3   n/a MPO474348   47322 (1999 XS21)          Discovered 1999-Dec-05 by LINEAR at Socorro Reference: 20020921/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-25 08:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin