+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .03640555528120654 4.9256e-08   a 2.761427202554553 2.8353e-08 au q 2.660895911876926 1.3737e-07 au i 6.341907210617042 6.614e-06 deg node 172.2431520831254 4.4885e-05 deg peri 248.7325188821231 0.00010297 deg M 38.57942802957832 9.0101e-05 deg tp 2459020.881068407847 (2020-Jun-20.38106841) 0.00041974 TDB period 1676.095750398347 4.59 2.5814e-05 7.067e-08 d yr n .214784865312403 3.3079e-09 deg/d Q 2.86195849323218 2.9385e-08 au   Orbit Determination Parameters    # obs. used (total)      202      data-arc span      6540 days (17.91 yr)      first obs. used      2003-02-22      last obs. used      2021-01-18      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .5538      source      ORB      producer      Otto Matic      solution date      2021-Apr-14 06:29:46   Additional Information  Earth MOID = 1.6792 au   Jupiter MOID = 2.24757 au   T_jup = 3.331  [ 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 16.66   n/a MPCxxxxx   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 ] 2021-May-12 12:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin