Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Near-Earth Object (NEO) Program
Search JPL
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2317349059852566 5.5623e-08  
a 2.559446612317165 2.0144e-08 au
q 1.966333492237563 1.4448e-07 au
i 12.93611777018567 6.3059e-06 deg
node 136.1933810676119 4.9357e-05 deg
peri 329.1272786633701 5.6997e-05 deg
M 41.57133242477064 3.2512e-05 deg
tp 2457227.793380655917
(2015-Jul-24.29338066)
0.00013399 JED
period 1495.607172957071
4.09
1.7657e-05
4.834e-08
d
yr
n .2407049167116647 2.8417e-09 deg/d
Q 3.152559732396767 2.4812e-08 au
  Orbit Determination Parameters
   # obs. used (total)      488  
   data-arc span      10537 days (28.85 yr)  
   first obs. used      1987-01-26  
   last obs. used      2015-12-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5629  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:46:48  

Additional Information
 Earth MOID = .993534 au 
 Jupiter MOID = 2.01911 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2016-Feb-08 16:50 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin