+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   39797 (1997 TK18) Classification: Jupiter Trojan          SPK-ID: 2039797 [ 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 .08349335688406047 2.0339e-07   a 5.175458784512435 3.0499e-07 AU q 4.743342357178393 1.2424e-06 AU i 14.98027960217515 1.6095e-05 deg node 27.27431927255073 5.4099e-05 deg peri 125.2019918229749 0.00011772 deg M 339.9366377748997 9.7957e-05 deg tp 2456640.175102436433 (2013-Dec-13.67510244) 0.001172 JED period 4300.527294930228 11.77 0.00038014 1.041e-06 d yr n .08371066506760555 7.3996e-09 deg/d Q 5.607575211846479 3.3045e-07 AU   Orbit Determination Parameters    # obs. used (total)      219      data-arc span      8074 days (22.11 yr)      first obs. used      1991-03-15      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .60501      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:32:19   Additional Information  Earth MOID = 3.77779 AU   T_jup = 2.926  [ 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 12.092 mag .50486 1 autocmod 2.5c 39797 (1997 TK18)          Discovered 1997-Oct-03 by BAO Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20020526/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1997 TK18 = 1999 XB208  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 12:58 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin