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21000 L'Encyclopedie (1987 BY1)
Classification: Main-belt Asteroid          SPK-ID: 2021000
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 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2313896467498275 5.88e-08  
a 2.558592285951058 2.2042e-08 AU
q 1.966560520728009 1.5087e-07 AU
i 12.93724923178993 6.3592e-06 deg
node 136.195036437882 5.2171e-05 deg
peri 329.1114146325982 5.9342e-05 deg
M 305.2726814455594 3.2471e-05 deg
tp 2457227.748866215561
(2015-Jul-24.24886622)
0.00013628 JED
period 1494.858399762836
4.09
1.9317e-05
5.289e-08
d
yr
n .2408254855825242 3.112e-09 deg/d
Q 3.150624051174107 2.7142e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      434  
   data-arc span      10081 days (27.60 yr)  
   first obs. used      1987-01-26  
   last obs. used      2014-09-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55496  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Sep-12 14:14:09  

Additional Information
 Earth MOID = .993855 AU 
 T_jup = 3.363 
[ 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 14.8 mag n/a MPO266066  

21000 L´Encyclopédie           Discovered 1987 Jan. 26 by E. W. Elst at the European Southern Observatory.
The Encyclopédie or Dictionnaire raisonné des sciences, des arts et des métiers (1751-1772), by Diderot and d´Alembert, may be considered the principal work of the Age of Enlightenment.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1987 BY1 = 2000 JS79 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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