+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   8172 (1991 RP15) Classification: Main-belt Asteroid          SPK-ID: 2008172 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244256 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1485382 n/a   a 3.0698049 n/a AU q 2.6138216 n/a AU i 1.44730 n/a deg node 47.59347 n/a deg peri 16.11929 n/a deg M 306.66962 n/a deg tp 2456691.5293317 (2014-Feb-03.02933170) n/a JED period 1964.5567763 5.38 n/a n/a d yr n 0.18324744 n/a deg/d Q 3.5257882 n/a AU   Orbit Determination Parameters    # obs. used (total)      864      first obs. used      1975-??-??      last obs. used      2012-11-02      # oppositions      20      planetary ephem.      DE403      condition code      0      fit RMS      0.54      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.214  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.7 mag n/a PDS3 (MPC 31080)   8172 (1991 RP15)          Discovered 1991-Sep-15 by Holt, H. E. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1991 RP15 = 1975 TK2 = 1975 VA2 = 1982 BE11 = 1986 TE18 = 1986 VO6 = 1988 CY6  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-23 00:13 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin