+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .01859048717014351 5.1821e-08   a 5.141522282015552 9.9199e-08 au q 5.045938877996734 3.3744e-07 au i 9.204268467725253 6.4527e-06 deg node 27.8808362771244 3.0401e-05 deg peri 46.95798418448457 0.00018777 deg M 315.5201405854983 0.00018668 deg tp 2459922.634663397733 (2022-Dec-09.13466340) 0.0022118 TDB period 4258.297605172539 11.66 0.00012324 3.374e-07 d yr n .08454082672913919 2.4467e-09 deg/d Q 5.237105686034369 1.0104e-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 = 4.0658 au   Jupiter MOID = .12999 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-Jul-29 02:02 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin