+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   441371 (2008 EH21) Classification: Main-belt Asteroid          SPK-ID: 2441371 [ 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 12 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1562226610618339 5.9137e-08   a 2.248167693718079 1.7477e-08 au q 1.896952954092195 1.3446e-07 au i 1.636607088074806 6.4092e-06 deg node 278.4552990976854 0.00024875 deg peri 307.8519849896779 0.00025051 deg M 194.4314969692416 2.8009e-05 deg tp 2459566.761066169367 (2021-Dec-18.26106617) 9.9153e-05 TDB period 1231.236497820489 3.37 1.4357e-05 3.931e-08 d yr n .2923889932090747 3.4096e-09 deg/d Q 2.599382433343964 2.0208e-08 au   Orbit Determination Parameters    # obs. used (total)      96      data-arc span      4702 days (12.87 yr)      first obs. used      2006-11-16      last obs. used      2019-10-01      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55476      source      ORB      producer      Otto Matic      solution date      2019-Nov-08 15:56:48   Additional Information  Earth MOID = .88791 au   Jupiter MOID = 2.38677 au   T_jup = 3.612  [ 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 17.9   n/a MPO437716   441371 (2008 EH21)          Discovered 2008-Mar-02 by Spacewatch at Kitt Peak Reference: Last Updated: 2015-09-02 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-11 10:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin