+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15215 (1981 EH13) Classification: Main-belt Asteroid          SPK-ID: 2015215 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2162787702675511 3.5839e-08   a 2.399121674997835 7.0966e-09 au q 1.880242589407076 8.66e-08 au i 2.983904704356898 3.514e-06 deg node 256.4264746333204 7.0666e-05 deg peri 65.89598060600564 7.1293e-05 deg M 73.19289615539213 7.5264e-06 deg tp 2458724.541821456072 (2019-Aug-29.04182146) 2.8561e-05 TDB period 1357.303092159381 3.72 6.0224e-06 1.649e-08 d yr n .2652318425262433 1.1768e-09 deg/d Q 2.918000760588594 8.6315e-09 au   Orbit Determination Parameters    # obs. used (total)      985      data-arc span      15473 days (42.36 yr)      first obs. used      1978-07-07      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51683      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 20:26:37   Additional Information  Earth MOID = .87014 au   Jupiter MOID = 2.41368 au   T_jup = 3.493  [ hide covariance matrix ] Orbital Elements at Epoch 2457330.5 (2015-Nov-04.0) TDB Reference: JPL 23 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2169171918258431 3.5796e-08   q 1.878542206669708 8.6593e-08 au tp 2457368.285477094557 (2015-Dec-11.78547709) 3.0142e-05 TDB node 256.4542603775437 7.0728e-05 deg peri 66.09300388107798 7.1353e-05 deg i 2.982421796876229 3.5129e-06 deg   Orbit Determination Parameters    # obs. used (total)      985      data-arc span      15473 days (42.36 yr)      first obs. used      1978-07-07      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51683      source      ORB      producer      Otto Matic      solution date      2020-Dec-17 20:26:37   Additional Information  Jupiter MOID = 2.41368 au   T_jup = 3.493  Orbit Covariance (6×6)   e q tp node peri i e 1.2813848018159E-15 -3.093258400611018E-15 1.523369745269961E-14 1.509917068389179E-14 1.904637253460247E-14 -2.245106523392449E-15 q -3.093258400611018E-15 7.498357879421087E-15 -1.003888867100077E-13 -3.700706384458365E-14 -6.52970283011891E-14 5.546168724911273E-15 tp 1.523369745269961E-14 -1.003888867100077E-13 9.085282008933867E-10 1.520847288309607E-12 2.947050847490092E-10 7.207541838399091E-14 node 1.509917068389179E-14 -3.700706384458365E-14 1.520847288309607E-12 5.002497829316435E-9 -4.994799856497968E-9 4.444762481464514E-11 peri 1.904637253460247E-14 -6.52970283011891E-14 2.947050847490092E-10 -4.994799856497968E-9 5.091211888689546E-9 -4.443237801621189E-11 i -2.245106523392449E-15 5.546168724911273E-15 7.207541838399091E-14 4.444762481464514E-11 -4.443237801621189E-11 1.234072965968151E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.2   n/a MPO502285   15215 (1981 EH13)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring Reference: 20000621/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 14:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin