+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   11157 (1998 AJ) Classification: Main-belt Asteroid          SPK-ID: 2011157 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO244285 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1792352 n/a   a 3.1046391 n/a AU q 2.5481785 n/a AU i 4.10929 n/a deg node 118.43170 n/a deg peri 306.53375 n/a deg M 316.34130 n/a deg tp 2456642.8167324 (2013-Dec-16.31673240) n/a JED period 1998.0902697 5.47 n/a n/a d yr n 0.18017204 n/a deg/d Q 3.6610997 n/a AU   Orbit Determination Parameters    # obs. used (total)      782      first obs. used      1980-??-??      last obs. used      2012-11-03      # oppositions      16      planetary ephem.      DE403      condition code      0      fit RMS      0.55      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.192  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.0 mag n/a PDS3 (MPC 35252)   11157 (1998 AJ)          Discovered 1998-Jan-02 by Shimizu, Y., Urata, T. at Nachi-Katsuura (905) Reference: 19990728/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1998 AJ = 1969 VQ2 = 1980 VU2  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-25 20:37 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin