+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   227878 (2007 EH22) Classification: Main-belt Asteroid          SPK-ID: 2227878 [ 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 19 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1617158596957086 5.5693e-08   a 2.365422541511926 1.4433e-08 au q 1.982896201667717 1.3002e-07 au i 2.118230918001652 5.7689e-06 deg node 201.8510193175193 0.00015341 deg peri 349.0413380573025 0.00015425 deg M 271.0396547010858 1.7515e-05 deg tp 2459528.863958673337 (2021-Nov-10.36395867) 6.5926e-05 TDB period 1328.805826070061 3.64 1.2162e-05 3.33e-08 d yr n .2709199440107055 2.4796e-09 deg/d Q 2.747948881356135 1.6767e-08 au   Orbit Determination Parameters    # obs. used (total)      314      data-arc span      9595 days (26.27 yr)      first obs. used      1994-10-12      last obs. used      2021-01-18      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .59484      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 13:12:24   Additional Information  Earth MOID = .98235 au   Jupiter MOID = 2.20841 au   T_jup = 3.530  [ 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 17.0   n/a MPO440188   227878 (2007 EH22)          Discovered 2007-Mar-10 by Mt. Lemmon Survey at Mount Lemmon Reference: 20091202/Numbers.arc Last Updated: 2009-12-04 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-12 17:21 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin