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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1556392069457727 3.4532e-08  
a 2.430305658207968 7.3385e-09 au
q 2.052054812928656 8.3816e-08 au
i 5.405881490756371 3.5099e-06 deg
node 234.09457980 3.874e-05 deg
peri 92.55897956549323 4.0488e-05 deg
M 254.1801690402368 1.3611e-05 deg
tp 2459607.275077562785
(2022-Jan-27.77507756)
5.3198e-05 TDB
period 1383.852408328684
3.79
6.268e-06
1.716e-08
d
yr
n .2601433489824119 1.1783e-09 deg/d
Q 2.80855650348728 8.4806e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1986  
   data-arc span      11258 days (30.82 yr)  
   first obs. used      1990-02-24  
   last obs. used      2020-12-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47466  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:02:54  

Additional Information
 Earth MOID = 1.04729 au 
 Jupiter MOID = 2.5302 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 14.21   n/a E2021B10  

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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