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7631 Vokrouhlicky (1981 WH)
Classification: Main-belt Asteroid          SPK-ID: 2007631
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2835948992461996 5.868e-08  
a 2.370905842423132 8.2565e-09 au
q 1.698529038918918 1.384e-07 au
i 4.030712872473178 4.9724e-06 deg
node 136.1622137124993 8.0625e-05 deg
peri 273.9590081630973 8.1209e-05 deg
M 176.6663973634629 8.3972e-06 deg
tp 2456946.133075815775
(2014-Oct-15.63307582)
3.0048e-05 JED
period 1333.428972469899
3.65
6.9653e-06
1.907e-08
d
yr
n .2699806344639228 1.4103e-09 deg/d
Q 3.043282645927346 1.0598e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1371  
   data-arc span      23109 days (63.27 yr)  
   first obs. used      1953-01-09  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .47991  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:59:46  

Additional Information
 Earth MOID = .713328 au 
 Jupiter MOID = 2.35757 au 
 T_jup = 3.486 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.9 mag n/a MPO337319  

7631 Vokrouhlický           Discovered 1981 Nov. 20 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
Named in honor of David Vokrouhlický (b. 1966), a Czech physicist at Charles University, Prague, who has developed new physical models for the nongravitational forces acting on small minor planets and meteoroids. In particular, Vokrouhlický has studied the so-called Yarkovsky effect, which causes a slow orbital drift into main-belt resonances and is an important mechanism for transporting meteorites to Earth. Name proposed and citation written by P. Farinella.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1981 WH = 1975 BJ 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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