+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   365756 ISON (2010 WZ71) Classification: Centaur          SPK-ID: 2365756 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5233359507796882 1.0211e-06   a 5.72903718847211 1.1646e-05 au q 2.730826064390866 6.904e-07 au i 19.97451683632948 2.5351e-05 deg node 220.0104747625822 4.3045e-05 deg peri 268.4378561482107 6.2923e-05 deg M 231.2758283467155 0.00071844 deg tp 2460791.429515579586 (2025-Apr-25.92951558) 0.015456 TDB period 5008.652355870103 13.71 0.015273 4.182e-05 d yr n .07187562130920959 2.1917e-07 deg/d Q 8.727248312553353 1.7741e-05 au   Orbit Determination Parameters    # obs. used (total)      71      data-arc span      1679 days (4.60 yr)      first obs. used      2008-10-29      last obs. used      2013-06-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .71732      source      ORB      producer      Otto Matic      solution date      2017-Apr-10 05:47:44   Additional Information  Earth MOID = 1.83619 au   Jupiter MOID = .57167 au   T_jup = 2.589  [ 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 14.3   n/a MPO339148   365756 ISON           Discovered 2010 Nov. 4 by L. Elenin at Mayhill-ISON. The International Scientific Optical Network (ISON) is an international collaboration of optical observatories. The main scientific tasks of the ISON network are the study of the populations of space debris and minor solar-system, and observation of the optical counterparts of gamma-ray bursts. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2015-02-03 Last Updated: 2015-02-04 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Sep-29 21:32 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin