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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1016344330622034 3.7618e-08  
a 2.682956515084152 9.7929e-09 au
q 2.410275750743029 1.0123e-07 au
i 2.370514058917471 3.4969e-06 deg
node 285.3708612476993 0.00010186 deg
peri 132.2701105665065 0.00010335 deg
M 244.7582712400687 1.8167e-05 deg
tp 2459714.337908543230
(2022-May-14.83790854)
8.1915e-05 TDB
period 1605.162028252042
4.39
8.7883e-06
2.406e-08
d
yr
n .2242764242261735 1.2279e-09 deg/d
Q 2.955637279425274 1.0788e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2428  
   data-arc span      33240 days (91.01 yr)  
   first obs. used      1929-09-29  
   last obs. used      2020-10-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44971  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:26:43  

Additional Information
 Earth MOID = 1.42244 au 
 Jupiter MOID = 2.32933 au 
 T_jup = 3.367 
[ 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 12.69   n/a E2021B10  
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. 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:
[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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