+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   12143 Harwit (4631 P-L) Classification: Main-belt Asteroid          SPK-ID: 2012143 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04783019227066307 9.5477e-08   a 2.329627048969342 1.03e-08 AU q 2.218200539298201 2.2448e-07 AU i 7.210251073348111 9.1012e-06 deg node 13.76836921558604 4.522e-05 deg peri 182.9978241424989 7.9941e-05 deg M 86.33289799674871 6.5903e-05 deg tp 2456089.040310851857 (2012-Jun-10.54031085) 0.0002379 JED period 1298.757376331257 3.56 8.6132e-06 2.358e-08 d yr n .2771880310831664 1.8383e-09 deg/d Q 2.441053558640483 1.0792e-08 AU   Orbit Determination Parameters    # obs. used (total)      933      data-arc span      21205 days (58.06 yr)      first obs. used      1955-03-23      last obs. used      2013-04-12      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .51254      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:47:24   Additional Information  Earth MOID = 1.21643 AU   T_jup = 3.560  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.4 mag n/a PDS3 (MPC 36313)   12143 Harwit           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld at Leiden on Palomar Schmidt plates taken by T. Gehrels. Czech-born American astrophysicist Martin O. Harwit (b. 1931) pioneered infrared observations and spectroscopy from space. He has helped plan several space-based observatories for NASA and the European Space Agency. From 1987 to 1995 he was director of the Smithsonian Institution's National Air and Space Museum. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20070926/MPCPages.arc Last Updated: 2007-09-30 Alternate Designations  4631 P-L = 1985 SS6 = 1992 SA2  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 11:09 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin