+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   58135 (1981 EK42) Classification: Main-belt Asteroid          SPK-ID: 2058135 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .105732965255945 3.941e-08   a 3.121121757944517 2.0959e-08 au q 2.791116299552196 1.1731e-07 au i 4.931456042634252 5.4856e-06 deg node 196.1538284664549 4.8379e-05 deg peri 304.5388245306866 5.5422e-05 deg M 79.18881584224771 2.6365e-05 deg tp 2458557.477440629700 (2019-Mar-14.97744063) 0.00014702 TDB period 2014.02331474466 5.51 2.0287e-05 5.554e-08 d yr n .1787466894570886 1.8005e-09 deg/d Q 3.45112721633684 2.3175e-08 au   Orbit Determination Parameters    # obs. used (total)      793      data-arc span      14377 days (39.36 yr)      first obs. used      1981-02-12      last obs. used      2020-06-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .57416      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:52:13   Additional Information  Earth MOID = 1.80764 au   Jupiter MOID = 1.58817 au   T_jup = 3.202  [ show covariance matrix ] [ 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 14.75   n/a E2021B10   diameter diameter 5.292 km 0.533 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.076   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   58135 (1981 EK42)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring Reference: 20030614/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1981 EK42 = 2000 SV256  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-01 11:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin