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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1554860000430333 3.4546e-08  
a 2.430724516075467 7.403e-09 au
q 2.052780883864355 8.3869e-08 au
i 5.405482797384875 3.7384e-06 deg
node 234.1005464344477 3.8773e-05 deg
peri 92.50840998916799 4.0687e-05 deg
M 202.2022160616002 1.3791e-05 deg
tp 2459607.236941259974
(2022-Jan-27.73694126)
5.4225e-05 TDB
period 1384.210179649026
3.79
6.3236e-06
1.731e-08
d
yr
n .2600761107617919 1.1881e-09 deg/d
Q 2.80866814828658 8.554e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1846  
   data-arc span      10938 days (29.95 yr)  
   first obs. used      1990-02-24  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47927  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 20:11:01  

Additional Information
 Earth MOID = 1.04992 au 
 Jupiter MOID = 2.53014 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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