+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   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 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.arc Last 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 ] 2020-Dec-02 00:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin