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4830 Thomascooley (1988 RG4)
Classification: Main-belt Asteroid          SPK-ID: 2004830
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.

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06768780592964194 3.1445e-08  
a 2.392676182704889 7.9734e-09 au
q 2.230721181597484 7.6945e-08 au
i 6.415540699611239 3.6391e-06 deg
node 119.5456885480738 3.0523e-05 deg
peri 84.09177224217397 4.1321e-05 deg
M 329.5610263587591 2.7496e-05 deg
tp 2459114.801471233941
0.00010325 TDB
period 1351.836961692678
n .2663043031085883 1.3312e-09 deg/d
Q 2.554631183812294 8.5131e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2481  
   data-arc span      16142 days (44.19 yr)  
   first obs. used      1976-04-23  
   last obs. used      2020-07-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44585  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:48:22  

Additional Information
 Earth MOID = 1.23806 au 
 Jupiter MOID = 2.42153 au 
 T_jup = 3.519 
[ 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 13.2   n/a MPO502199  
diameter diameter 5.742 km 0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 32.6173 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.371   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4830 Thomascooley           Discovered 1988 Sept. 1 by H. Debehogne at the European Southern Observatory.
Thomas Benton Cooley (1871--1945) was an American hematologist and professor of hygiene and medicine at the University of Michigan and Wayne State University. He is remembered for his discovery of a form of childhood anemia that became known as Cooley's anemia, a severe form of thalassemia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-10-08Last Updated: 2015-01-12

Alternate Designations
 1988 RG4 = 1976 HE = 1983 CU = 1985 VW4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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