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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1205969506641314 9.7507e-08  
a 5.165416076030401 2.3097e-07 au
q 4.542482648349652 5.2486e-07 au
i 7.777725564578061 1.1011e-05 deg
node 182.108124160614 5.1129e-05 deg
peri 205.4284741179833 6.5462e-05 deg
M 218.0802066892328 4.9615e-05 deg
tp 2459290.928712882924
(2021-Mar-17.42871288)
0.00067304 JED
period 4288.01594507172
11.74
0.00028761
7.874e-07
d
yr
n .08395491169144399 5.6311e-09 deg/d
Q 5.78834950371115 2.5883e-07 au
  Orbit Determination Parameters
   # obs. used (total)      340  
   data-arc span      15549 days (42.57 yr)  
   first obs. used      1973-09-20  
   last obs. used      2016-04-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54094  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 17:23:31  

Additional Information
 Earth MOID = 3.54755 au 
 Jupiter MOID = .289263 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 12.8 mag n/a MPO338377  

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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