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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1167845019746593 8.7795e-09  
a 2.199081544453656 4.9979e-09 au
q 1.942262901482971 1.9187e-08 au
i 1.921223548348695 4.6756e-07 deg
node 149.8884031461648 1.4602e-05 deg
peri 252.4916469148101 1.8331e-05 deg
M 271.6633557849958 9.9484e-06 deg
tp 2459492.779815005737
(2021-Oct-05.27981501)
3.3301e-05 TDB
period 1191.133468302993
3.26
4.0607e-06
1.112e-08
d
yr
n .3022331330450246 1.0303e-09 deg/d
Q 2.45590018742434 5.5816e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2303  
   data-arc span      24308 days (66.55 yr)  
   first obs. used      1954-02-26  
   last obs. used      2020-09-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48273  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 21:27:36  

Additional Information
 Earth MOID = .950655 au 
 Jupiter MOID = 2.88842 au 
 T_jup = 3.657 
[ 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 14.29   n/a E2021B10  
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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