+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   16541 (1991 PW18) Classification: Main-belt Asteroid          SPK-ID: 2016541 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO256985 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0642917 n/a   a 2.8993242 n/a AU q 2.7129217 n/a AU i 1.73421 n/a deg node 202.87161 n/a deg peri 206.57137 n/a deg M 70.33077 n/a deg tp 2456048.2212427 (2012-Apr-30.72124270) n/a JED period 1803.1986942 4.94 n/a n/a d yr n 0.19964522 n/a deg/d Q 3.0857267 n/a AU   Orbit Determination Parameters    # obs. used (total)      849      first obs. used      1981-??-??      last obs. used      2013-03-08      # oppositions      17      planetary ephem.      DE403      condition code      0      fit RMS      0.50      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.284  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.1 mag n/a PDS3 (MPO 2863)   rotation period rot_per 9. h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong. Published Reference List: [Chiorny, V.G.; Shevchenko, V.G.; Krugly, Yu.N.; Velichko, F.P.; Gaftonyuk, N.M. (2007) Planet. Space Sci. 55, 986-997.] 16541 (1991 PW18)          Discovered 1991-Aug-08 by Holt, H. E. at Palomar (675) Reference: 20000913/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 PW18 = 2000 KA33  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-Jun-19 02:06 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin