+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   20321 Lightdonovan (1998 HJ19) Classification: Main-belt Asteroid          SPK-ID: 2020321 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1164988334870526 3.0516e-08   a 2.31294834594524 7.9082e-09 au q 2.043492561726812 7.2917e-08 au i 4.848164049008227 3.7117e-06 deg node 349.3763783151105 4.0531e-05 deg peri 55.18005490077158 4.4197e-05 deg M 310.7844822843196 1.7911e-05 deg tp 2459376.149486713453 (2021-Jun-10.64948671) 6.4273e-05 TDB period 1284.834908821781 3.52 6.5895e-06 1.804e-08 d yr n .2801916398194124 1.437e-09 deg/d Q 2.582404130163669 8.8295e-09 au   Orbit Determination Parameters    # obs. used (total)      1233      data-arc span      9770 days (26.75 yr)      first obs. used      1994-04-08      last obs. used      2021-01-06      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .53146      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 03:17:06   Additional Information  Earth MOID = 1.05556 au   Jupiter MOID = 2.77032 au   T_jup = 3.569  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.54   n/a E2021B10   20321 Lightdonovan           Discovered 1998 Apr. 18 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Donna Light-Donovan mentored a finalist in the 2004 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Croton-Harmon High School, Croton-on-Hudson, 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 HJ19 = 1996 XN10  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-18 21:23 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin