+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   146946 (2002 EC21) Classification: Inner Main-belt Asteroid          SPK-ID: 2146946 [ 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 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09197653015550147 4.1286e-08   a 1.905795447100586 6.2949e-09 au q 1.730506994690121 7.9293e-08 au i 19.86021058202878 5.8218e-06 deg node 359.5902069239799 1.3174e-05 deg peri 84.2101052268348 4.9352e-05 deg M 45.98373866029092 4.1411e-05 deg tp 2458877.751941403578 (2020-Jan-29.25194140) 0.00011078 TDB period 960.9766926774793 2.63 4.7612e-06 1.304e-08 d yr n .3746188671828926 1.8561e-09 deg/d Q 2.08108389951105 6.8739e-09 au   Orbit Determination Parameters    # obs. used (total)      528      data-arc span      7740 days (21.19 yr)      first obs. used      1998-11-19      last obs. used      2020-01-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57136      source      ORB      producer      Otto Matic      solution date      2020-Feb-24 08:40:35   Additional Information  Earth MOID = .830245 au   Jupiter MOID = 3.0679 au   T_jup = 3.864  [ 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 16.7   n/a MPO220373   146946 (2002 EC21)          Discovered 2002-Mar-10 by NEAT at Haleakala Reference: 20070106/Numbers.arc Last Updated: 2007-01-09 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-12 16:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin