+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   27678 (1981 EX3) Classification: Main-belt Asteroid          SPK-ID: 2027678 [ 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 20 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09665631823751783 3.6281e-08   a 2.746151586573439 1.3882e-08 au q 2.480718684893132 9.9263e-08 au i 7.928642693614568 3.946e-06 deg node 233.690750215941 3.0891e-05 deg peri 237.8498194771757 3.8298e-05 deg M 276.5376031426969 2.3106e-05 deg tp 2459385.866127047595 (2021-Jun-20.36612705) 0.0001077 TDB period 1662.207304857612 4.55 1.2604e-05 3.451e-08 d yr n .2165794837671215 1.6423e-09 deg/d Q 3.011584488253746 1.5224e-08 au   Orbit Determination Parameters    # obs. used (total)      1057      data-arc span      15506 days (42.45 yr)      first obs. used      1977-05-18      last obs. used      2019-10-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52124      source      ORB      producer      Otto Matic      solution date      2019-Nov-07 05:01:22   Additional Information  Earth MOID = 1.50813 au   Jupiter MOID = 2.1543 au   T_jup = 3.327  [ 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 14.5   n/a MPO395272   diameter diameter 4.337 km 0.316 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.196   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   27678 (1981 EX3)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring Reference: 20010902/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Aug-12 12:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin