+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   393056 (2013 AT55) Classification: Main-belt Asteroid          SPK-ID: 2393056 [ 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 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2062059408483247 1.0774e-07   a 2.565413655738897 2.4641e-08 au q 2.036410119192118 2.8605e-07 au i 8.510643682867036 5.9336e-06 deg node 81.26313929354916 5.5175e-05 deg peri 243.8053104942334 5.7376e-05 deg M 63.08877602881979 1.2225e-05 deg tp 2458737.482811446970 (2019-Sep-10.98281145) 5.0818e-05 TDB period 1500.840463854251 4.11 2.1624e-05 5.92e-08 d yr n .2398656010882714 3.4559e-09 deg/d Q 3.094417192285677 2.9722e-08 au   Orbit Determination Parameters    # obs. used (total)      223      data-arc span      6743 days (18.46 yr)      first obs. used      2002-05-07      last obs. used      2020-10-22      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5131      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 16:20:20   Additional Information  Earth MOID = 1.04102 au   Jupiter MOID = 2.27217 au   T_jup = 3.387  [ 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 16.8   n/a MPO446665   393056 (2013 AT55)          Discovered 2006-Apr-25 by Spacewatch at Kitt Peak Reference: Last Updated: 2014-04-17 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-26 19:54 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin