+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   146945 (2002 EC20) Classification: Main-belt Asteroid          SPK-ID: 2146945 [ 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 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1816634277490847 5.2811e-08   a 3.04143841339504 2.3243e-08 au q 2.488920285929959 1.5731e-07 au i .2177088747444496 5.2754e-06 deg node 206.8320917771129 0.0013948 deg peri 354.8493125648851 0.0013949 deg M 128.734234101909 1.6901e-05 deg tp 2458307.698977751816 (2018-Jul-08.19897775) 8.6574e-05 TDB period 1937.389613177088 5.30 2.2209e-05 6.08e-08 d yr n .1858170383238728 2.1301e-09 deg/d Q 3.593956540860121 2.7466e-08 au   Orbit Determination Parameters    # obs. used (total)      418      data-arc span      9482 days (25.96 yr)      first obs. used      1994-11-01      last obs. used      2020-10-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58576      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 14:22:24   Additional Information  Earth MOID = 1.486 au   Jupiter MOID = 1.36631 au   T_jup = 3.214  [ hide covariance matrix ] Orbital Elements at Epoch 2456929.5 (2014-Sep-29.0) TDB Reference: JPL 17 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .179768116078279 5.3019e-08   q 2.497844197267753 1.5781e-07 au tp 2456368.369372374563 (2013-Mar-16.86937237) 7.855e-05 TDB node 206.6797224981709 0.0014018 deg peri 355.4017671155616 0.0014019 deg i .2160136781517611 5.2848e-06 deg   Orbit Determination Parameters    # obs. used (total)      418      data-arc span      9482 days (25.96 yr)      first obs. used      1994-11-01      last obs. used      2020-10-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .58576      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 14:22:24   Additional Information  Jupiter MOID = 1.36631 au   T_jup = 3.214  Orbit Covariance (6×6)   e q tp node peri i e 2.810989028588345E-15 -8.309154013300918E-15 -1.031531087883488E-12 -5.67332618427811E-14 -2.032333893389719E-13 -4.142658355901373E-17 q -8.309154013300918E-15 2.490426062074507E-14 3.551167994249595E-12 2.707959996015493E-13 6.022688744244267E-13 1.985443064136403E-16 tp -1.031531087883488E-12 3.551167994249595E-12 6.170046586053966E-9 -3.033325023509588E-11 1.18767364876047E-9 -1.15639219755116E-13 node -5.67332618427811E-14 2.707959996015493E-13 -3.033325023509588E-11 1.965055279492611E-6 -1.965032786801972E-6 -2.906880979874602E-9 peri -2.032333893389719E-13 6.022688744244267E-13 1.18767364876047E-9 -1.965032786801972E-6 1.965242059323436E-6 2.906851893956325E-9 i -4.142658355901373E-17 1.985443064136403E-16 -1.15639219755116E-13 -2.906880979874602E-9 2.906851893956325E-9 2.79286590743858E-11 [ 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 15.6   n/a MPO449801   146945 (2002 EC20)          Discovered 2002-Mar-05 by Spacewatch at Kitt Peak Reference: 20070106/Numbers.arc Last Updated: 2007-01-09 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-27 05:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin