+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   23708 (1997 TR18) Classification: Main-belt Asteroid          SPK-ID: 2023708 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244391 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0477576 n/a   a 2.9848057 n/a AU q 2.8422585 n/a AU i 9.46358 n/a deg node 200.23678 n/a deg peri 292.18668 n/a deg M 234.78023 n/a deg tp 2457055.6532592 (2015-Feb-02.15325920) n/a JED period 1883.5298396 5.16 n/a n/a d yr n 0.19113050 n/a deg/d Q 3.1273529 n/a AU   Orbit Determination Parameters    # obs. used (total)      804      first obs. used      1981-??-??      last obs. used      2012-11-04      # oppositions      17      planetary ephem.      DE403      condition code      0      fit RMS      0.53      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.236  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.2 mag n/a PDS3 (MPO 11171)   23708 (1997 TR18)          Discovered 1997-Oct-05 by Beijing Schmidt CCD Asteroid Program at Xinglong (327) Reference: 20010408/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1997 TR18 = 1998 XU84  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 11:24 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin