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7987 Walshkevin (1981 EV22)
Classification: Main-belt Asteroid          SPK-ID: 2007987
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 64 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2029338461161435 3.6515e-08  
a 2.772539338872861 9.4464e-09 au
q 2.209897267327081 1.0335e-07 au
i 3.303317895901845 3.7221e-06 deg
node 168.3224730564125 4.9075e-05 deg
peri 221.448733427804 4.974e-05 deg
M 354.3838376682687 7.7415e-06 deg
tp 2459226.805838763520
(2021-Jan-12.30583876)
3.6266e-05 TDB
period 1686.22297495948
4.62
8.6178e-06
2.359e-08
d
yr
n .2134948967876866 1.0911e-09 deg/d
Q 3.335181410418639 1.1363e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2027  
   data-arc span      14635 days (40.07 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4898  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:12:40  

Additional Information
 Earth MOID = 1.21517 au 
 Jupiter MOID = 2.11284 au 
 T_jup = 3.304 
[ 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 13.91   n/a E2021B10  

7987 Walshkevin           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Kevin John Walsh (b. 1978) is a scientist at the Southwest Research Institute of Boulder, CO. His research includes the composition and formation of minor-planet binaries as well as early solar system dynamical processes that may have had consequences for shaping the current structure of the asteroid belt.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

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