+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   100231 Monceau (1994 PB20) Classification: Outer Main-belt Asteroid          SPK-ID: 2100231 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2937332017000896 5.3006e-08   a 3.961360334225382 2.8853e-08 au q 2.797777280165624 2.0882e-07 au i 2.783138853521452 5.8203e-06 deg node 7.902280684421229 0.0001037 deg peri 13.43764461392912 0.00010424 deg M 108.8112861097883 8.9242e-06 deg tp 2458330.064905905464 (2018-Jul-30.56490591) 6.6472e-05 TDB period 2879.817389143465 7.88 3.1463e-05 8.614e-08 d yr n .1250079263210067 1.3658e-09 deg/d Q 5.124943388285141 3.7328e-08 au   Orbit Determination Parameters    # obs. used (total)      644      data-arc span      9630 days (26.37 yr)      first obs. used      1994-08-12      last obs. used      2020-12-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52499      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 08:24:45   Additional Information  Earth MOID = 1.79959 au   Jupiter MOID = .378901 au   T_jup = 2.980  [ 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 14.45   n/a E2021B55   diameter diameter 9.250 km 0.124 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   geometric albedo albedo 0.041   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)   100231 Monceau           Discovered 1994 Aug. 12 by E. W. Elst at the European Southern Observatory. Henri-Louis Duhamel du Monceau (1700-1782), a French physician, naval engineer and botanist, served three times as president of the French Academy of Sciences. Although chiefly occupying himself with experiments on plant physiology, his most famous written work was the Eléments d´architecture naval 1752--1758. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2013-07-22 Last Updated: 2014-08-13 [ show close-approach data ] Alternate Designations  1994 PB20 = 2002 RA84  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-02 20:29 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin