Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1206210260592813 1.0621e-07  
a 5.164713911220233 2.3892e-07 au
q 4.541740819946205 5.4941e-07 au
i 7.778299382416946 1.1827e-05 deg
node 182.113151511055 5.257e-05 deg
peri 205.5481328622305 6.6978e-05 deg
M 201.1345699405735 4.8935e-05 deg
tp 2459292.384997774530
(2021-Mar-18.88499777)
0.00067319 JED
period 4287.141632663953
11.74
0.00029748
8.145e-07
d
yr
n .08397203331402478 5.8268e-09 deg/d
Q 5.787687002494262 2.6774e-07 au
  Orbit Determination Parameters
   # obs. used (total)      328  
   data-arc span      15221 days (41.67 yr)  
   first obs. used      1973-09-20  
   last obs. used      2015-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54642  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 22:10:16  

Additional Information
 Earth MOID = 3.54668 au 
 Jupiter MOID = .287681 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2016-Feb-13 04:35 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin