+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   P/2011 NO1 (Elenin) Classification: Jupiter-family Comet [NEO]          SPK-ID: 1003138 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455758.5 (2011-Jul-16.0) TDB Reference: JPL 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .7766683813315823 0.0019931   a 5.564808912335272 0.042944 AU q 1.242797781972273 0.0015037 AU i 15.28100571061748 0.077972 deg node 296.0978344978848 0.012189 deg peri 263.6029798321476 0.11602 deg M 13.24755643189973 0.13679 deg tp 2455582.055921428927 (2011-Jan-20.55592143) 0.25636 JED period 4794.836588326002 13.13 55.503 0.152 d yr n .07508076518738777 0.00086911 deg/d Q 9.886820042698272 0.076298 AU   Orbit Determination Parameters    # obs. used (total)      57      data-arc span      22 days      first obs. used      2011-07-07      last obs. used      2011-07-29      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      7      fit RMS      .9145      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 21:24:48   Additional Information  Earth MOID = .380673 AU   T_jup = 2.192  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.3 mag 0.6 7 from 41 observations, assumed slope, autocmod 2.5a comet total magnitude slope K1 14.   n/a 7 autocmod 2.5a comet nuclear magnitude M2 16.7 mag 0.2 7 from 7 observations, autocmod 2.5a comet nuclear magnitude slope K2 5.   n/a 7 autocmod 2.5a comet nuclear phase coefficient PC 0.03   n/a 7 autocmod 2.5a [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.1   P/2011 NO1        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-21 21:21 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin