+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   18741 (1998 WB6) Classification: Main-belt Asteroid          SPK-ID: 2018741 [ 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 .08856644660070154 7.226e-08   a 2.270168773741761 1.7613e-08 AU q 2.069107992267581 1.6514e-07 AU i 5.939255802957033 6.6574e-06 deg node 243.7589308367533 6.7023e-05 deg peri 250.8562499311628 7.7418e-05 deg M 5.091147445101446 4.0311e-05 deg tp 2456382.831535045202 (2013-Mar-31.33153505) 0.00013984 JED period 1249.35438470696 3.42 1.4539e-05 3.981e-08 d yr n .2881488266313157 3.3533e-09 deg/d Q 2.471229555215941 1.9173e-08 AU   Orbit Determination Parameters    # obs. used (total)      899      data-arc span      9899 days (27.10 yr)      first obs. used      1986-03-15      last obs. used      2013-04-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55301      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 14:20:00   Additional Information  Earth MOID = 1.09195 AU   T_jup = 3.601  [ 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 13.8 mag n/a PDS3 (MPO 5281)   18741 (1998 WB6)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 15:14 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin