+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   187685 (2008 DO21) Classification: Main-belt Asteroid          SPK-ID: 2187685 [ 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 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09271569316608486 4.9887e-08   a 2.245313432587166 1.3197e-08 au q 2.037137641309726 1.1489e-07 au i 3.217535756425753 6.2001e-06 deg node 160.8239885264464 0.00011566 deg peri 336.7494224529061 0.00012257 deg M 313.432111627928 3.9836e-05 deg tp 2459359.463689159286 (2021-May-24.96368916) 0.00013602 TDB period 1228.892485742674 3.36 1.0834e-05 2.966e-08 d yr n .2929467013401388 2.5828e-09 deg/d Q 2.453489223864606 1.4421e-08 au   Orbit Determination Parameters    # obs. used (total)      198      data-arc span      8321 days (22.78 yr)      first obs. used      1998-04-03      last obs. used      2021-01-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .64175      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 21:56:25   Additional Information  Earth MOID = 1.05082 au   Jupiter MOID = 2.55443 au   T_jup = 3.624  [ 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 17.7   n/a MPO436929   187685 (2008 DO21)          Discovered 2008-Feb-28 by Spacewatch at Kitt Peak Reference: 20080520/Numbers.arc Last Updated: 2008-05-22 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-17 03:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin