+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   9949 Brontosaurus (1990 SK6) Classification: Main-belt Asteroid          SPK-ID: 2009949 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256938 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0608740 n/a   a 2.3555893 n/a AU q 2.2121952 n/a AU i 7.70423 n/a deg node 29.89097 n/a deg peri 173.66976 n/a deg M 246.99354 n/a deg tp 2456815.0229383 (2014-Jun-06.52293830) n/a JED period 1320.5285592 3.62 n/a n/a d yr n 0.27261811 n/a deg/d Q 2.4989834 n/a AU   Orbit Determination Parameters    # obs. used (total)      845      first obs. used      1978-??-??      last obs. used      2013-03-07      # oppositions      16      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.540  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.0 mag n/a PDS3 (MPC 33659)   9949 Brontosaurus           Discovered 1990 Sept. 22 by E. W. Elst at the European Southern Observatory. Brontosaurus was a gigantic dinosaur, as large as 20 meters and weighing about 30 tons. It lived in Upper Jurassic times and walked on all four legs. Many skeletons have been found in the United States. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20021120/MPCPages.arc Last Updated: 2003-10-02 Alternate Designations  1990 SK6 = 1978 GT1 = 1985 DM1 = 1992 BS  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 17:47 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin