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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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1212339187016291 1.2626e-07  
a 5.162046064147692 2.5887e-07 AU
q 4.536230991272745 6.0928e-07 AU
i 7.78064914641055 1.353e-05 deg
node 182.1204462484571 6.3506e-05 deg
peri 205.8344704530887 8.0155e-05 deg
M 150.3528982355172 5.0104e-05 deg
tp 2455011.375579025957
(2009-Jun-28.87557903)
0.00056205 JED
period 4283.82025959847
11.73
0.00032224
8.822e-07
d
yr
n .08403713932520208 6.3215e-09 deg/d
Q 5.787861137022638 2.9025e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      290  
   data-arc span      14832 days (40.61 yr)  
   first obs. used      1973-09-20  
   last obs. used      2014-04-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56452  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-11 13:09:36  

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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