+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   C/2011 P2 (PANSTARRS) Classification: Chiron-type Comet          SPK-ID: 1003141 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] [ show orbit diagram ] Orbital Elements at Epoch 2455776.5 (2011-Aug-03.0) TDB Reference: JPL 4 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .370581593497336 0.00048322   a 9.766783280470628 0.0048544 AU q 6.147393169050685 0.0017168 AU i 8.989759279067645 0.00050126 deg node 204.0109499753214 0.0093914 deg peri 76.38107845975426 0.11634 deg M 10.44537849798575 0.045889 deg tp 2455453.020000048037 (2010-Sep-13.52000005) 1.4609 JED period 11148.73912947846 30.52 8.312 0.02276 d yr n .03229064702465962 2.4074e-05 deg/d Q 13.38617339189057 0.0066534 AU   Orbit Determination Parameters    # obs. used (total)      41      data-arc span      66 days      first obs. used      2011-06-22      last obs. used      2011-08-27      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      5      fit RMS      .39713      data source      ORB      producer      Otto Matic      solution date      2011-Sep-14 21:24:51   Additional Information  Earth MOID = 5.14453 AU   T_jup = 3.046  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 8.3 mag 0.5 4 from 31 observations, assumed slope, autocmod 2.5a comet total magnitude slope K1 10.   n/a 4 autocmod 2.5a comet nuclear magnitude M2 12.4 mag 0.3 4 from 4 observations, autocmod 2.5a comet nuclear magnitude slope K2 5.   n/a 4 autocmod 2.5a comet nuclear phase coefficient PC 0.03   n/a 4 autocmod 2.5a Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2010.7   C/2011 P2        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ] 2013-May-18 09:38 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin