+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   42981 Jenniskens (1999 TY224) Classification: Main-belt Asteroid          SPK-ID: 2042981 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: MPO250617 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.1425344 n/a   a 2.5372227 n/a AU q 2.1755812 n/a AU i 5.94541 n/a deg node 204.19458 n/a deg peri 28.52663 n/a deg M 260.59283 n/a deg tp 2456808.1162733 (2014-May-30.61627330) n/a JED period 1476.1697610 4.04 n/a n/a d yr n 0.24387439 n/a deg/d Q 2.8988642 n/a AU   Orbit Determination Parameters    # obs. used (total)      282      first obs. used      1953-??-??      last obs. used      2013-01-17      # oppositions      13      planetary ephem.      DE403      condition code      1      fit RMS      0.50      data source      MPC:mpn      producer      MPCLINUX   Additional Information  T_jup = 3.426  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.5 mag n/a MPO250617   42981 Jenniskens           Discovered 1999 Oct. 2 at Ondrejov. Peter Jenniskens (b. 1962), meteor astronomer of NASA Ames, organized several successful airborne missions (Leonid multi-instrument aircraft campaigns) to observe the Leonid returns from 1998 to 2002. He has substantially improved our knowledge of the behavior of meteor streams. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20021120/MPCPages.arc Last Updated: 2003-10-02 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2013-May-22 09:43 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin