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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2832035063037457 5.8957e-08  
a 2.371730885800352 8.5165e-09 au
q 1.700048382932804 1.3908e-07 au
i 4.030825863570352 5.4764e-06 deg
node 136.1690878906973 8.1927e-05 deg
peri 273.9905957145488 8.2806e-05 deg
M 122.6430754194119 8.9383e-06 deg
tp 2456945.996667027227
(2014-Oct-15.49666703)
3.2708e-05 JED
period 1334.125056067375
3.65
7.186e-06
1.967e-08
d
yr
n .2698397712888915 1.4534e-09 deg/d
Q 3.0434133886679 1.0928e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1245  
   data-arc span      22987 days (62.93 yr)  
   first obs. used      1953-01-09  
   last obs. used      2015-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .48745  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:04:21  

Additional Information
 Earth MOID = .715254 au 
 Jupiter MOID = 2.35879 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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