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8140 Hardersen (1981 EO15)
Classification: Main-belt Asteroid          SPK-ID: 2008140
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06840249088395059 5.2225e-08  
a 2.734040619982704 2.1865e-08 AU
q 2.547025431397986 1.4542e-07 AU
i 6.796948671334946 5.6164e-06 deg
node 220.6751647572817 4.9111e-05 deg
peri 192.8737194334482 6.9266e-05 deg
M 290.0198635296854 5.0437e-05 deg
tp 2457321.480134835251
(2015-Oct-25.98013484)
0.0002332 JED
period 1651.223538120817
4.52
1.9808e-05
5.423e-08
d
yr
n .2180201479017794 2.6154e-09 deg/d
Q 2.921055808567421 2.3361e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1111  
   data-arc span      14578 days (39.91 yr)  
   first obs. used      1974-09-25  
   last obs. used      2014-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52725  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:12:02  

Additional Information
 Earth MOID = 1.55785 AU 
 T_jup = 3.339 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.1 mag n/a MPO267740  

8140 Hardersen           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
Paul S. Hardersen (b. 1965) is a professor and observatory director in the Department of Space Studies at the University of North Dakota. His research includes mineralogical analysis of minor-planet surfaces using telescopic measurements in the near-infrared.
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

[ show close-approach data ]
Alternate Designations
 1981 EO15 = 1974 SM4 = 1979 YG5 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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