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

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1551907978847843 3.4567e-08  
a 2.431196111409899 7.5542e-09 au
q 2.053896847065812 8.3995e-08 au
i 5.405747627048592 4.3463e-06 deg
node 234.1091357030954 3.9198e-05 deg
peri 92.47850073223341 4.1615e-05 deg
M 98.23082162141348 1.4551e-05 deg
tp 2458222.689788991258
(2018-Apr-14.18978899)
5.5504e-05 TDB
period 1384.613034057102
3.79
6.4534e-06
1.767e-08
d
yr
n .2600004413833602 1.2118e-09 deg/d
Q 2.808495375753986 8.7265e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1721  
   data-arc span      10868 days (29.75 yr)  
   first obs. used      1990-02-24  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48614  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 22:40:27  

Additional Information
 Earth MOID = 1.05014 au 
 Jupiter MOID = 2.52776 au 
 T_jup = 3.485 
[ 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 14.2   n/a MPO358745  

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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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