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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1172023914314586 2.5962e-08  
a 2.198347466447391 5.6203e-09 au
q 1.940695886182468 5.6428e-08 au
i 1.920662134569929 4.4649e-06 deg
node 149.9096263989893 8.4373e-05 deg
peri 252.5733602497993 8.7055e-05 deg
M 211.1256261935886 2.0689e-05 deg
tp 2459492.834624707735
(2021-Oct-05.33462471)		 6.8845e-05 TDB
period 1190.537097575025
3.26		 4.5656e-06
1.25e-08		 d
yr
n .3023845294138879 1.1596e-09 deg/d
Q 2.455999046712313 6.279e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1952  
   data-arc span      24076 days (65.92 yr)  
   first obs. used      1954-02-26  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50122  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:22:06  

Additional Information
 Earth MOID = .950127 au 
 Jupiter MOID = 2.88835 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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