+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   173117 Promachus (1973 SA1) Classification: Jupiter Trojan          SPK-ID: 2173117 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO257779 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1218968 n/a   a 5.1599440 n/a AU q 4.5309633 n/a AU i 7.78275 n/a deg node 182.11719 n/a deg peri 205.85260 n/a deg M 116.65570 n/a deg tp 2455013.2032829 (2009-Jun-30.70328290) n/a JED period 4281.2037318 11.72 n/a n/a d yr n 0.08408850 n/a deg/d Q 5.7889247 n/a AU   Orbit Determination Parameters    # obs. used (total)      238      first obs. used      1973-??-??      last obs. used      2013-03-04      # oppositions      12      planetary ephem.      DE403      condition code      0      fit RMS      0.49      data source      MPC:mpu      producer      MPCLINUX   Additional Information  T_jup = 2.967   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 12.7 mag n/a MPO257779   173117 Promachus           Discovered 1973 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels. Promachus was a Greek warrior in the Iliad who was killed by the Trojan hero Acamas. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20080520/MPCPages.arc Last Updated: 2008-05-22 Alternate Designations  1973 SA1 = 1996 RN30 = 1997 TL29 = 2002 EA122 = 2005 LX31 = 2007 VC1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 04:13 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin