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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 2 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2825539812396697 6.3123e-08  
a 2.371672639843209 1.2214e-08 AU
q 1.701547093258313 1.5134e-07 AU
i 4.030821781437872 6.8177e-06 deg
node 136.1728493110106 9.8251e-05 deg
peri 273.9872158558048 9.9119e-05 deg
M 320.7967376267239 1.5638e-05 deg
tp 2456945.778133166848
(2014-Oct-15.27813317)
5.874e-05 JED
period 1334.075910369052
3.65
1.0305e-05
2.821e-08
d
yr
n .2698497118506634 2.0845e-09 deg/d
Q 3.041798186428105 1.5665e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      945  
   data-arc span      22068 days (60.42 yr)  
   first obs. used      1953-01-09  
   last obs. used      2013-06-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54273  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-Aug-05 15:45:41  

Additional Information
 Earth MOID = .716744 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 13.8 mag n/a MPO263417  

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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