+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   30708 Echepolos (4101 T-3) Classification: Jupiter Trojan          SPK-ID: 2030708 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244453 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0141297 n/a   a 5.2199540 n/a AU q 5.1461976 n/a AU i 24.13490 n/a deg node 29.43334 n/a deg peri 24.17292 n/a deg M 310.08660 n/a deg tp 2457004.4668152 (2014-Dec-12.96681520) n/a JED period 4356.1058447 11.93 n/a n/a d yr n 0.08264262 n/a deg/d Q 5.2937104 n/a AU   Orbit Determination Parameters    # obs. used (total)      302      first obs. used      1954-??-??      last obs. used      2012-11-01      # oppositions      17      planetary ephem.      DE403      condition code      0      fit RMS      0.64      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 2.825   MPC Jupiter Trojan  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.1 mag n/a PDS3 (MPO 16690)   30708 Echepolos           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Echepolos was the first hero in the great fight after the duel of Paris against Menelaos, who was killed by Antilochos. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030318/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  4101 T-3 = 1989 TF6 = 1996 FR16  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 05:22 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin