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9553 Colas (1985 UG2)
Classification: Main-belt Asteroid          SPK-ID: 2009553
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1174357607729263 2.6117e-08  
a 2.198057680402037 5.8086e-09 au
q 1.93992710448125 5.6731e-08 au
i 1.920640015793167 4.5221e-06 deg
node 149.9166325936535 8.5109e-05 deg
peri 252.6732630620613 8.7861e-05 deg
M 90.01903184328988 2.0882e-05 deg
tp 2458302.861648102849
(2018-Jul-03.36164810)
6.8869e-05 TDB
period 1190.301700528245
3.26
4.7183e-06
1.292e-08
d
yr
n .3024443297360957 1.1989e-09 deg/d
Q 2.456188256322824 6.4908e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1934  
   data-arc span      23808 days (65.18 yr)  
   first obs. used      1954-02-26  
   last obs. used      2019-05-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49782  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 01:43:18  

Additional Information
 Earth MOID = .948812 au 
 Jupiter MOID = 2.88867 au 
 T_jup = 3.657 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.2   n/a MPO421722  
diameter diameter 3.791 km 0.141 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.178   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9553 Colas           Discovered 1985 Oct. 17 at Caussols.
François Colas (b. 1959) is an expert on modern solar-system astrometry at the Institut de Mécanique Celeste in Paris. He has contributed to numerous research papers in observational planetary astronomy. A strong supporter of the Pic du Midi Observatory, he has many fruitful relations with the amateur community.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19991123/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1985 UG2 = 1990 EB8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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