+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21520 Dianaeheart (1998 KR55) Classification: Main-belt Asteroid          SPK-ID: 2021520 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04526961967764529 3.5897e-08   a 2.97086811399062 1.4948e-08 au q 2.836378044357822 1.0111e-07 au i 9.233285137579125 3.5325e-06 deg node 159.6710540761188 2.1339e-05 deg peri 111.0140360333324 4.5404e-05 deg M 131.0659921604694 4.0711e-05 deg tp 2458519.556616452093 (2019-Feb-05.05661645) 0.00021078 TDB period 1870.35259136567 5.12 1.4116e-05 3.865e-08 d yr n .1924770771361028 1.4527e-09 deg/d Q 3.105358183623419 1.5625e-08 au   Orbit Determination Parameters    # obs. used (total)      1721      data-arc span      11905 days (32.59 yr)      first obs. used      1988-06-13      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .49795      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 02:53:01   Additional Information  Earth MOID = 1.83487 au   Jupiter MOID = 1.96981 au   T_jup = 3.242  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 13.9   n/a MPO435900   21520 Dianaeheart           Discovered 1998 May 23 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Diana Lynn Eheart (b. 1986) was awarded second place in the 2005 Intel International Science and Engineering Fair for her medicine and health project. She attends the Hamilton High School, Chandler, Arizona, U.S.A. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20050822/MPCPages.arc Last Updated: 2005-08-26 [ show close-approach data ] Alternate Designations  1998 KR55 = 1989 TN9  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-13 04:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin