+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   41800 Robwilliams (2000 WM19) Classification: Main-belt Asteroid          SPK-ID: 2041800 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250607 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.2329805 n/a   a 2.6042604 n/a AU q 1.9975185 n/a AU i 25.01938 n/a deg node 220.51458 n/a deg peri 271.42804 n/a deg M 299.69033 n/a deg tp 2456657.6635865 (2013-Dec-31.16358650) n/a JED period 1535.0588247 4.20 n/a n/a d yr n 0.23451870 n/a deg/d Q 3.2110023 n/a AU   Orbit Determination Parameters    # obs. used (total)      550      first obs. used      1998-??-??      last obs. used      2013-01-09      # oppositions      11      planetary ephem.      DE403      condition code      0      fit RMS      0.51      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.245  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.8 mag n/a MPO250607   41800 Robwilliams           Discovered 2000 Nov. 25 by C. W. Juels at Fountain Hills. Robert A. Williams (b. 1942) is a psychiatrist and author who has been the director of the Biological Psychiatry Institute in Phoenix since 1987. His recent works include Brain Basics (1999)---a book for everyone about biological psychiatry---and the Merry The Cranberry Series of titles about children's values (2002). NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040306/MPCPages.arc Last Updated: 2004-03-08 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 23:34 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin