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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06805971753413087 4.9587e-08  
a 2.733195044475716 1.5164e-08 au
q 2.547174561783012 1.3754e-07 au
i 6.798127306312844 5.2459e-06 deg
node 220.6697696354672 4.0311e-05 deg
peri 193.0495646406515 5.6334e-05 deg
M 60.7102614937206 3.7776e-05 deg
tp 2457322.167470476364
(2015-Oct-26.66747048)
0.00017301 JED
period 1650.457569497914
4.52
1.3735e-05
3.76e-08
d
yr
n .2181213298985418 1.8152e-09 deg/d
Q 2.919215527168419 1.6196e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1400  
   data-arc span      15182 days (41.57 yr)  
   first obs. used      1974-09-25  
   last obs. used      2016-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52857  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:01:18  

Additional Information
 Earth MOID = 1.55683 au 
 Jupiter MOID = 2.36821 au 
 T_jup = 3.340 
[ 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 13.3 mag n/a MPO358710  

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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