+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   7181 (1991 PH12) Classification: Main-belt Asteroid          SPK-ID: 2007181 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO240259 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1345963 n/a   a 3.0884589 n/a AU q 2.6727638 n/a AU i 11.65006 n/a deg node 291.19016 n/a deg peri 148.20763 n/a deg M 272.43891 n/a deg tp 2456882.6918087 (2014-Aug-13.19180870) n/a JED period 1982.4907518 5.43 n/a n/a d yr n 0.18158975 n/a deg/d Q 3.5041540 n/a AU   Orbit Determination Parameters    # obs. used (total)      637      first obs. used      1953-??-??      last obs. used      2012-10-11      # oppositions      17      planetary ephem.      DE403      condition code      0      fit RMS      0.53      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.180  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.0 mag n/a PDS3 (MPC 28116)   7181 (1991 PH12)          Discovered 1991-Aug-07 by Holt, H. E. at Palomar (675) Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1991 PH12 = 1986 RN4 = 1986 TU2 = 1986 VK9  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-18 22:27 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin