+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   214121 (2004 XA28) Classification: Main-belt Asteroid          SPK-ID: 2214121 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1789689633421398 4.2823e-08   a 2.333924291668254 1.4055e-08 au q 1.916224280669348 9.832e-08 au i 3.037508214166316 5.6331e-06 deg node 54.7856874986407 0.00011461 deg peri 58.87833349801728 0.00011666 deg M 99.19713540961291 2.1358e-05 deg tp 2458641.639875645008 (2019-Jun-07.13987564) 7.5833e-05 TDB period 1302.352575347431 3.57 1.1764e-05 3.221e-08 d yr n .276422841874415 2.497e-09 deg/d Q 2.751624302667159 1.657e-08 au   Orbit Determination Parameters    # obs. used (total)      211      data-arc span      7150 days (19.58 yr)      first obs. used      2000-09-29      last obs. used      2020-04-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59843      source      ORB      producer      Otto Matic      solution date      2020-May-21 09:02:56   Additional Information  Earth MOID = .934824 au   Jupiter MOID = 2.35451 au   T_jup = 3.545  [ 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 17.6   n/a MPO459955   214121 (2004 XA28)          Discovered 2004-Dec-10 by LINEAR at Socorro Reference: 20090509/Numbers.arc Last Updated: 2009-05-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Sep-18 12:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin