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JPL Small-Body Database Browser
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2186 Keldysh (1973 SQ4)
Classification: Main-belt Asteroid          SPK-ID: 2002186
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1031561769409964 4.0609e-08  
a 2.679512533758761 1.057e-08 au
q 2.403104264710724 1.0823e-07 au
i 2.371611112413304 3.5766e-06 deg
node 285.3713719076948 0.00011567 deg
peri 132.4822756129493 0.00011741 deg
M 109.8180827093193 1.9618e-05 deg
tp 2458111.787471568117
(2017-Dec-24.28747157)
8.7139e-05 TDB
period 1602.072317189959
4.39
9.4798e-06
2.595e-08
d
yr
n .2247089573530872 1.3296e-09 deg/d
Q 2.955920802806797 1.1661e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2149  
   data-arc span      32731 days (89.61 yr)  
   first obs. used      1929-09-29  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45927  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:31:33  

Additional Information
 Earth MOID = 1.41566 au 
 Jupiter MOID = 2.33079 au 
 T_jup = 3.368 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.6   n/a MPO337265  
diameter diameter 12.841 km 0.142 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.567 h n/a LCDB (Rev. 2019-January); 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:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.129   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2186 Keldysh           Discovered 1973 Sept. 27 by L. I. Chernykh at the Crimean Astrophysical Observatory.
Named in memory of Academician Mstislav Vsevolodovich Keldysh (1911-1978), famous Soviet scientist and mathematician who made a valuable contribution to space science and engineering. He was president of the U.S.S.R. Academy of Sciences from 1961 to 1975.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5849Last Updated: 2006-03-21

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Alternate Designations
 1973 SQ4 = 1929 TX = 1966 DD = 1975 EJ2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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