+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   11889 (1991 AH2) Classification: Main-belt Asteroid          SPK-ID: 2011889 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO240301 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1774055 n/a   a 2.7618665 n/a AU q 2.2718962 n/a AU i 19.10596 n/a deg node 120.89596 n/a deg peri 214.36508 n/a deg M 27.15231 n/a deg tp 2456274.0535218 (2012-Dec-12.55352180) n/a JED period 1676.4957439 4.59 n/a n/a d yr n 0.21473362 n/a deg/d Q 3.2518368 n/a AU   Orbit Determination Parameters    # obs. used (total)      728      first obs. used      1991-??-??      last obs. used      2012-10-08      # oppositions      14      planetary ephem.      DE403      condition code      0      fit RMS      0.51      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.239  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.4 mag n/a PDS3 (MPC 36243)   11889 (1991 AH2)          Discovered 1991-Jan-07 by McNaught, R. H. at Siding Spring (413) Reference: 19991026/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1991 AH2 = 1998 KZ55  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 01:52 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin