+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16453 (1989 SW8) Classification: Main-belt Asteroid          SPK-ID: 2016453 [ 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 .1913835419196869 8.2613e-08   a 2.673158383751407 1.8544e-08 AU q 2.161559864156757 2.1964e-07 AU i 13.40643312232664 9.1111e-06 deg node 183.0333388810039 2.8513e-05 deg peri 190.312048861267 3.3558e-05 deg M 130.592714964926 1.8545e-05 deg tp 2455821.402201595768 (2011-Sep-16.90220160) 8.0139e-05 JED period 1596.377006799459 4.37 1.6611e-05 4.548e-08 d yr n .2255106396964186 2.3465e-09 deg/d Q 3.184756903346057 2.2093e-08 AU   Orbit Determination Parameters    # obs. used (total)      714      data-arc span      22745 days (62.27 yr)      first obs. used      1951-01-04      last obs. used      2013-04-13      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55708      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:02:59   Additional Information  Earth MOID = 1.16215 AU   T_jup = 3.315  [ 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 13.9 mag n/a PDS3 (MPO 2838)   16453 (1989 SW8)          Discovered 1989-Sep-23 by Debehogne, H. at La Silla (809) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1989 SW8 = 1998 QE93  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 16:31 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin