+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   312477 (2008 SD278) Classification: Jupiter Trojan          SPK-ID: 2312477 [ 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 8 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06877746105168797 1.1305e-07   a 5.180977704191552 1.8947e-07 au q 4.824643211931853 6.7416e-07 au i 6.579867621112773 7.5917e-06 deg node 269.7289723288296 0.00010729 deg peri 103.1400675764676 0.00014224 deg M 352.4002279027705 8.4177e-05 deg tp 2459091.431442357168 (2020-Aug-29.93144236) 0.0010061 TDB period 4307.408015631692 11.79 0.00023628 6.469e-07 d yr n .08357694434647261 4.5845e-09 deg/d Q 5.53731219645125 2.025e-07 au   Orbit Determination Parameters    # obs. used (total)      166      data-arc span      8778 days (24.03 yr)      first obs. used      1996-10-12      last obs. used      2020-10-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5588      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 18:47:16   Additional Information  Earth MOID = 3.83304 au   Jupiter MOID = .0191521 au   T_jup = 2.982  [ 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 13.9   n/a MPO455303   312477 (2008 SD278)          Discovered 2008-Sep-28 by Mt. Lemmon Survey at Mount Lemmon Reference: 20120109/Numbers.arc Last Updated: 2012-01-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-28 13:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin