+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   312390 (2008 ER147) Classification: Main-belt Asteroid          SPK-ID: 2312390 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03619147352205419 5.0371e-08   a 2.760835133374442 2.9327e-08 au q 2.660916441746164 1.4212e-07 au i 6.341990680958123 6.84e-06 deg node 172.2499676655645 4.5234e-05 deg peri 248.7405680584598 0.00010441 deg M 355.6089417273511 9.1959e-05 deg tp 2459020.937408994606 (2020-Jun-20.43740899) 0.00042799 TDB period 1675.556729430437 4.59 2.6698e-05 7.31e-08 d yr n .2148539608816306 3.4235e-09 deg/d Q 2.86075382500272 3.0389e-08 au   Orbit Determination Parameters    # obs. used (total)      186      data-arc span      6091 days (16.68 yr)      first obs. used      2003-02-22      last obs. used      2019-10-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58727      source      ORB      producer      Otto Matic      solution date      2019-Nov-08 08:10:44   Additional Information  Earth MOID = 1.68008 au   Jupiter MOID = 2.2488 au   T_jup = 3.332  [ 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 16.5   n/a MPO494656   312390 (2008 ER147)          Discovered 2008-Mar-01 by Spacewatch at Kitt Peak Reference: 20120109/Numbers.arc Last Updated: 2012-01-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-10 00:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin