+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   12490 Leiden (1997 JB13) Classification: Outer Main-belt Asteroid          SPK-ID: 2012490 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250336 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1194076 n/a   a 3.2026939 n/a AU q 2.8202679 n/a AU i 0.95646 n/a deg node 146.45933 n/a deg peri 66.63970 n/a deg M 285.89584 n/a deg tp 2456831.4348995 (2014-Jun-22.93489950) n/a JED period 2093.4933181 5.73 n/a n/a d yr n 0.17196138 n/a deg/d Q 3.5851199 n/a AU   Orbit Determination Parameters    # obs. used (total)      465      first obs. used      1991-??-??      last obs. used      2013-01-21      # oppositions      15      planetary ephem.      DE403      condition code      0      fit RMS      0.58      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.182  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.3 mag n/a PDS3 (MPC 36737)   12490 Leiden           Discovered 1997 May 3 by E. W. Elst at the European Southern Observatory. Leiden is a city in Holland at the edge of the Rhine river. Throughout history it has been an intellectual and humanistic center, attracting students, scientists and philosophers from all over Europe to its famous university, founded in 1575. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040928/MPCPages.arc Last Updated: 2004-09-28 Alternate Designations  1997 JB13 = 1991 GH9  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-19 17:00 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin