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21964 Kevinhousen (1999 VK213)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021964
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03348540898008438 3.2368e-08  
a 3.21846833876246 2.0112e-08 au
q 3.110696610149547 1.0321e-07 au
i 13.7562719545495 4.3797e-06 deg
node 201.2392855523784 1.5599e-05 deg
peri 264.6824298889297 8.0561e-05 deg
M 218.1171175195034 8.1637e-05 deg
tp 2460227.689007142914
(2023-Oct-10.18900714)
0.00048014 TDB
period 2108.979161827935
5.77
1.9768e-05
5.412e-08
d
yr
n .170698699406766 1.6e-09 deg/d
Q 3.326240067375374 2.0785e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1284  
   data-arc span      12396 days (33.94 yr)  
   first obs. used      1987-08-31  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50307  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:46:47  

Additional Information
 Earth MOID = 2.16625 au 
 Jupiter MOID = 1.74695 au 
 T_jup = 3.144 
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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 13.78   n/a MPO636393  
diameter diameter 8.019 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.109   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21964 Kevinhousen           Discovered 1999 Nov. 13 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Kevin R. Housen (b. 1953) is an associate technical fellow at the Boeing Corporation. A pioneer in the study of shock physics as applied to asteroidal materials, his work has included modeling the production of asteroidal regoliths and developing crater formation and disruptive collision scaling laws.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

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Alternate Designations
 1999 VK213 = 1987 QD4 = 1990 EG2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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