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7636 Comba (1984 CM)
Classification: Main-belt Asteroid          SPK-ID: 2007636
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08240682280966211 2.1815e-08  
a 2.600804131329238 8.2099e-09 au
q 2.386480126116152 5.8265e-08 au
i 9.829534876847202 3.6219e-07 deg
node 26.42622635004317 5.959e-06 deg
peri 62.00651643703767 1.3661e-05 deg
M 325.1376105548682 1.3507e-05 deg
tp 2459348.859221480636
5.7606e-05 TDB
period 1532.003990061762
n .234986333152753 1.1127e-09 deg/d
Q 2.815128136542324 8.8865e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2293  
   data-arc span      13550 days (37.10 yr)  
   first obs. used      1984-01-28  
   last obs. used      2021-03-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41532  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 19:54:11  

Additional Information
 Earth MOID = 1.41954 au 
 Jupiter MOID = 2.3666 au 
 T_jup = 3.389 
[ 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 13.37   n/a E2021B10  
diameter diameter 11.345 km 0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 194.277 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 0.074   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

7636 Comba           Discovered 1984 Feb. 5 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of Paul G. Comba (b. 1926), who gave up a career in celestial mechanics and astronomy for one in mathematics and computer science. After teaching at the University of Hawaii during the 1950s, he worked for three decades at IBM in New York and Massachusetts, where he carried out software research and development in many areas, including database management, geometric modeling, elasticity and cryptography. Following his formal retirement to Prescott, Arizona, he undertook a program of astrometry of minor planets in 1995. He has already been credited with the discovery of 20 numbered objects. Name proposed by the discoverer following a suggestion by B. G. Marsden, who prepared the citation.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1984 CM = 1993 HH6 
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