+ View the NASA Portal + Near-Earth Object (NEO) Project Search JPL JPL Small-Body Database Browser Search: [ help ]   20341 Alanstack (1998 HX91) Classification: Main-belt Asteroid          SPK-ID: 2020341 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2455200.5 (2010-Jan-04.0) TDB Reference: MPO73875 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 0.0778602 n/a   a 2.4162609 n/a AU q 2.2281303 n/a AU i 5.09294 n/a deg node 168.68284 n/a deg peri 228.40549 n/a deg M 220.59165 n/a deg tp 2455731.7518375 (2011-Jun-19.25183750) n/a JED period 1371.8737902 3.76 n/a n/a d yr n 0.26241481 n/a deg/d Q 2.6043915 n/a AU   Orbit Determination Parameters    # obs. used (total)      305      first obs. used      1971-??-??      last obs. used      2005-02-09      # oppositions      10      planetary ephem.      DE403      quality code      0      fit RMS      0.62      data source      MPC:mpn      producer      MPC   Additional Information  T_jup = 3.507  [ 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 (MPO 7803)   20341 Alanstack           Discovered 1998 Apr. 21 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Alan Stack mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. He teaches at the Midwood High School, Brooklyn, New York. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20040415/MPCPages.arc Last Updated: 2004-04-20 Alternate Designations  1998 HX91 = 1971 BW3 = 1999 RE152  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2010-Feb-10 07:36 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin