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11876 Doncarpenter (1990 EM1)
Classification: Main-belt Asteroid          SPK-ID: 2011876
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1563961234221668 6.0202e-08  
a 2.430342131197792 1.1653e-08 AU
q 2.05024604328889 1.4878e-07 AU
i 5.400076281275195 5.8988e-06 deg
node 234.2195380563663 6.5064e-05 deg
peri 91.97393609925064 6.8221e-05 deg
M 42.63508262993608 1.9954e-05 deg
tp 2456836.605583425473
(2014-Jun-28.10558343)
7.6316e-05 JED
period 1383.883560844833
3.79
9.9533e-06
2.725e-08
d
yr
n .2601374929117787 1.871e-09 deg/d
Q 2.810438219106694 1.3476e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      910  
   data-arc span      8985 days (24.60 yr)  
   first obs. used      1990-02-24  
   last obs. used      2014-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51219  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:21:33  

Additional Information
 Earth MOID = 1.048 AU 
 T_jup = 3.485 
[ 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 14.1 mag n/a MPO266021  

11876 Doncarpenter           Discovered 1990 Mar. 2 by E. W. Elst at the European Southern Observatory.
For the past 42 years, Don Carpenter (b. 1938) has been associated with the Stanford research group devoted to passive and active whistler-mode probing of the earth's ionosphere and magnetosphere. In 1966 he discovered the plasmapause in the electron-density distribution of the magnetosphere.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Alternate Designations
 1990 EM1 = 1995 QR2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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