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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1212337843106883 1.268e-07  
a 5.162046060548645 2.2824e-07 AU
q 4.536231681842253 6.288e-07 AU
i 7.780643589619811 1.3962e-05 deg
node 182.1203465044936 6.7611e-05 deg
peri 205.8346876375089 8.6108e-05 deg
M 150.3527966296625 5.3543e-05 deg
tp 2455011.376789955998
(2009-Jun-28.87678996)
0.00060326 JED
period 4283.820255118366
11.73
0.00028411
7.779e-07
d
yr
n .08403713941308978 5.5735e-09 deg/d
Q 5.787860439255038 2.5591e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      286  
   data-arc span      14797 days (40.51 yr)  
   first obs. used      1973-09-20  
   last obs. used      2014-03-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .64234  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 16:32:18  

Additional Information
 Earth MOID = 3.54152 AU 
 T_jup = 2.967 
[ show covariance matrix ]

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.arcLast 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 ]
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