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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456338.5 (2013-Feb-15.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1170018303510555 2.608e-08  
q 1.940832824466682 5.6627e-08 au
tp 2455921.000423704604
(2011-Dec-25.50042370)
6.8641e-05 TDB
node 149.9280584039217 8.5099e-05 deg
peri 252.4703224687624 8.7884e-05 deg
i 1.919894827176413 4.524e-06 deg
  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
 Jupiter MOID = 2.88867 au 
 T_jup = 3.657 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.801905738213793E-16 -1.471006410168762E-15 -3.584389172839725E-13 4.102015704750594E-16 -1.278761811474809E-13 -1.252897552233517E-16
q -1.471006410168762E-15 3.206621418038979E-15 7.919914242256133E-13 -1.058827050330367E-15 2.843426453695256E-13 2.652779101955876E-16
tp -3.584389172839725E-13 7.919914242256133E-13 4.711600712303206E-9 -1.582545779192056E-11 1.51061142593257E-9 -1.302721031468394E-12
node 4.102015704750594E-16 -1.058827050330367E-15 -1.582545779192056E-11 7.241902899297301E-9 -7.242279002671796E-9 -6.03145973537134E-11
peri -1.278761811474809E-13 2.843426453695256E-13 1.51061142593257E-9 -7.242279002671796E-9 7.723522858769851E-9 5.988012020558681E-11
i -1.252897552233517E-16 2.652779101955876E-16 -1.302721031468394E-12 -6.03145973537134E-11 5.988012020558681E-11 2.046671110091895E-11

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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