+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   8646 (1988 TB1) Classification: Main-belt Asteroid          SPK-ID: 2008646 [ 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 .1499078982356991 7.0528e-08   a 2.430234868234153 1.6606e-08 AU q 2.06592346691806 1.671e-07 AU i 4.972793963676922 8.0904e-06 deg node 208.848894621816 6.1926e-05 deg peri 144.4932362290484 6.664e-05 deg M 189.1917543208076 2.5901e-05 deg tp 2457057.064096082230 (2015-Feb-03.56409608) 0.00010333 JED period 1383.791945463417 3.79 1.4183e-05 3.883e-08 d yr n .2601547155843864 2.6665e-09 deg/d Q 2.794546269550246 1.9095e-08 AU   Orbit Determination Parameters    # obs. used (total)      900      data-arc span      21303 days (58.32 yr)      first obs. used      1954-12-21      last obs. used      2013-04-18      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .60475      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 13:32:06   Additional Information  Earth MOID = 1.06303 AU   T_jup = 3.487  [ 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 31674)   8646 (1988 TB1)          Discovered 1988-Oct-13 by Ueda, S., Kaneda, H. at Kushiro (399) Reference: 19980511/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1988 TB1 = 1991 KH2 = 1992 WC4  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-24 18:08 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin