+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   259688 (2003 XN21) Classification: Main-belt Asteroid          SPK-ID: 2259688 [ 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 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1570099815379542 5.9637e-08   a 2.312061701753593 1.2402e-08 au q 1.949044936646651 1.4398e-07 au i 4.215504681618671 4.9179e-06 deg node 46.27345649289663 8.3656e-05 deg peri 8.271699181394728 8.6402e-05 deg M 276.5584236998525 2.4445e-05 deg tp 2459298.130583441965 (2021-Mar-24.63058344) 8.8278e-05 TDB period 1284.096187896655 3.52 1.0332e-05 2.829e-08 d yr n .2803528297904837 2.2558e-09 deg/d Q 2.675078466860536 1.435e-08 au   Orbit Determination Parameters    # obs. used (total)      211      data-arc span      7683 days (21.03 yr)      first obs. used      1999-10-08      last obs. used      2020-10-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55292      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 23:08:15   Additional Information  Earth MOID = .960524 au   Jupiter MOID = 2.66807 au   T_jup = 3.564  [ 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 17.3   n/a MPO433692   259688 (2003 XN21)          Discovered 2003-Dec-14 by Spacewatch at Kitt Peak Reference: 20110119/Numbers.arc Last Updated: 2011-01-25 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-22 22:10 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin