+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   18372 (1991 RF16) Classification: Main-belt Asteroid          SPK-ID: 2018372 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244350 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1345080 n/a   a 2.6319474 n/a AU q 2.2779294 n/a AU i 4.07023 n/a deg node 62.96854 n/a deg peri 290.45028 n/a deg M 21.86365 n/a deg tp 2456305.7815890 (2013-Jan-13.28158900) n/a JED period 1559.6036319 4.27 n/a n/a d yr n 0.23082788 n/a deg/d Q 2.9859654 n/a AU   Orbit Determination Parameters    # obs. used (total)      711      first obs. used      1991-??-??      last obs. used      2012-11-02      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.56      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.383  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.5 mag n/a PDS3 (MPO 5174)   18372 (1991 RF16)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar (675) Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 RF16 = 1997 AD21 = 1998 DF37  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-21 10:49 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin