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21000 L'Encyclopedie (1987 BY1)
Classification: Main-belt Asteroid          SPK-ID: 2021000
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 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2316627067466424 3.1791e-08  
a 2.558285481240075 1.1191e-08 au
q 1.965626142025363 7.769e-08 au
i 12.93443197238586 5.6022e-06 deg
node 136.1653876409773 3.0683e-05 deg
peri 328.8337276693646 3.7096e-05 deg
M 67.2465196660942 1.9821e-05 deg
tp 2458721.316821290072
(2019-Aug-25.81682129)
8.2003e-05 TDB
period 1494.589531690655
4.09
9.8071e-06
2.685e-08
d
yr
n .2408688087041356 1.5805e-09 deg/d
Q 3.150944820454787 1.3784e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1141  
   data-arc span      12196 days (33.39 yr)  
   first obs. used      1987-01-26  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51959  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:29  

Additional Information
 Earth MOID = .993162 au 
 Jupiter MOID = 2.01461 au 
 T_jup = 3.364 
[ 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 15.0   n/a MPO384934  
diameter diameter 5.886 km 0.275 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.067   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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