+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20961 Arkesilaos (1973 SS1) Classification: Jupiter Trojan          SPK-ID: 2020961 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01803130879503983 5.2949e-08   a 5.140228475037417 1.1215e-07 au q 5.047543428126961 3.3775e-07 au i 9.205290799730992 6.5276e-06 deg node 27.87876272377928 3.732e-05 deg peri 46.8866093329753 0.00021426 deg M 282.0504337745794 0.00021421 deg tp 2459922.186578867119 (2022-Dec-08.68657887) 0.0025447 TDB period 4256.690376346896 11.65 0.00013931 3.814e-07 d yr n .08457274740967959 2.7679e-09 deg/d Q 5.232913521947873 1.1417e-07 au   Orbit Determination Parameters    # obs. used (total)      807      data-arc span      16864 days (46.17 yr)      first obs. used      1973-09-19      last obs. used      2019-11-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .56644      source      ORB      producer      Otto Matic      solution date      2019-Dec-14 00:48:03   Additional Information  Earth MOID = 4.06764 au   Jupiter MOID = .128247 au   T_jup = 2.974  [ 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 11.9   n/a MPO279732   20961 Arkesilaos           Discovered 1973 Sept. 19 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Arkesilaos, who was from Boeotia, was one of the first heroes to join the Greek army. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20010705/MPCPages.arc Last Updated: 2009-05-11 Alternate Designations  1973 SS1 = 1996 RQ28  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-02 16:13 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin