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173117 Promachus (1973 SA1)
Classification: Jupiter Trojan          SPK-ID: 2173117
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1218147459870926 7.4685e-08  
a 5.165430197314663 1.4236e-07 au
q 4.53620462991472 4.6423e-07 au
i 7.777850165081012 8.0562e-06 deg
node 182.0674251958962 3.7906e-05 deg
peri 205.5895408320224 4.7003e-05 deg
M 335.6658681228744 3.2247e-05 deg
tp 2459290.348814969827
(2021-Mar-16.84881497)
0.00038971 TDB
period 4288.033529037631
11.74
0.00017726
4.853e-07
d
yr
n .08395456741701254 3.4706e-09 deg/d
Q 5.794655764714607 1.597e-07 au
  Orbit Determination Parameters
   # obs. used (total)      403  
   data-arc span      16811 days (46.03 yr)  
   first obs. used      1973-09-20  
   last obs. used      2019-09-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55875  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 19:45:16  

Additional Information
 Earth MOID = 3.54273 au 
 Jupiter MOID = .28649 au 
 T_jup = 2.967 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.7   n/a MPO454188  
diameter diameter 13.179 km 0.863 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.085   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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