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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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2313896642167083 5.6384e-08  
a 2.558592295344889 2.0468e-08 AU
q 1.966560483257578 1.4641e-07 AU
i 12.93724823188435 6.3232e-06 deg
node 136.1950603735392 4.9722e-05 deg
peri 329.1113887482608 5.7453e-05 deg
M 305.2726797281932 3.2453e-05 deg
tp 2457227.748874598237
(2015-Jul-24.24887460)
0.00013619 JED
period 1494.858407995359
4.09
1.7938e-05
4.911e-08
d
yr
n .2408254842562438 2.8899e-09 deg/d
Q 3.1506241074322 2.5205e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      461  
   data-arc span      10132 days (27.74 yr)  
   first obs. used      1987-01-26  
   last obs. used      2014-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56493  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:37:42  

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 14.9 mag n/a MPO309318  

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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