+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/2012 X2 (PANSTARRS) Classification: Jupiter-family Comet          SPK-ID: 1003225 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2456289.5 (2012-Dec-28.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .771099492778708 2.0382e-05   a 20.74400797556116 0.0018738 AU q 4.748313947408477 4.5287e-05 AU i 34.12221622409387 0.00018256 deg node 271.0215104395725 0.00013717 deg peri 215.6023844017527 0.0018092 deg M 359.0290792186377 0.00019235 deg tp 2456382.571931953220 (2013-Mar-31.07193195) 0.013042 JED period 34509.4019474468 94.48 4.6759 0.0128 d yr n .01043193969423845 1.4135e-06 deg/d Q 36.73970200371385 0.0033187 AU   Orbit Determination Parameters    # obs. used (total)      126      data-arc span      467 days (1.28 yr)      first obs. used      2012-01-11      last obs. used      2013-04-22      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      3      fit RMS      .48907      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 12:31:07   Additional Information  Earth MOID = 3.82376 AU   T_jup = 2.356  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 10.4 mag 0.6 13 2 parameter fit from 77 observations, autocmod 2.5c comet total magnitude slope K1 8.   n/a 13 autocmod 2.5c comet nuclear magnitude M2 12.0 mag 0.6 13 from 31 observations, autocmod 2.5c comet nuclear magnitude slope K2 5.   n/a 13 autocmod 2.5c comet nuclear phase coefficient PC 0.03   n/a 13 autocmod 2.5c Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2013.2   C/2012 X2        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] 2013-May-24 18:29 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin