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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2316627068802118 3.1831e-08  
a 2.558285480913973 1.1313e-08 au
q 1.965626141433098 7.7872e-08 au
i 12.93443149538171 5.6501e-06 deg
node 136.1653885146584 3.0697e-05 deg
peri 328.833726175237 3.7144e-05 deg
M 67.24652042620794 1.9921e-05 deg
tp 2458721.316818187736
(2019-Aug-25.81681819)
8.2396e-05 TDB
period 1494.589531404884
4.09
9.9135e-06
2.714e-08
d
yr
n .2408688087501906 1.5977e-09 deg/d
Q 3.150944820394848 1.3933e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1093  
   data-arc span      12146 days (33.25 yr)  
   first obs. used      1987-01-26  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5234  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 05:18:10  

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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