+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01832017432155183 5.1887e-08   a 5.140855529152961 9.9365e-08 au q 5.046674159696964 3.3779e-07 au i 9.204763776752813 6.4531e-06 deg node 27.88040696444727 3.0399e-05 deg peri 46.81724467077952 0.00019029 deg M 299.0617229914167 0.00018911 deg tp 2459921.174566738613 (2022-Dec-07.67456674) 0.0022415 TDB period 4257.469307662865 11.66 0.00012344 3.38e-07 d yr n .08455727428311674 2.4515e-09 deg/d Q 5.235036898608956 1.0119e-07 au   Orbit Determination Parameters    # obs. used (total)      1008      data-arc span      17313 days (47.40 yr)      first obs. used      1973-09-19      last obs. used      2021-02-12      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53385      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:35:19   Additional Information  Earth MOID = 4.06611 au   Jupiter MOID = .128978 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 11.83   n/a E2021B10   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 ] 2021-Apr-17 04:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin