+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   253P/PANSTARRS Classification: Jupiter-family Comet          SPK-ID: 1003147 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB Reference: JPL 13 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4125583951342929 2.5578e-06   a 3.469309011750889 6.8604e-06 AU q 2.038016453638003 1.25e-05 AU i 4.940348956269786 3.8502e-05 deg node 146.8956372024383 0.00023431 deg peri 230.8727177836223 0.0025447 deg M 72.49581816010924 0.0010193 deg tp 2455889.193932889406 (2011-Nov-23.69393289) 0.0057331 JED period 2360.276613223562 6.46 0.007001 1.917e-05 d yr n .152524495638809 4.5242e-07 deg/d Q 4.900601569863776 9.6907e-06 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.506618689838595E-8 1.146E-8 A2 [EST] 3.957379730753531E-12 1.211E-10   Orbit Determination Parameters    # obs. used (total)      347      data-arc span      4910 days (13.44 yr)      first obs. used      1998-09-14      last obs. used      2012-02-23      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      2      fit RMS      .60052      data source      ORB      producer      Ryan S. Park      solution date      2013-Mar-03 19:30:45   Additional Information  Earth MOID = 1.04187 AU   T_jup = 2.982  [ 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 13.1 mag 0.7 13 2 parameter fit from 161 observations, autocmod 2.5b comet total magnitude slope K1 14.   n/a 13 autocmod 2.5b comet nuclear magnitude M2 15.9 mag 0.5 13 from 143 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 13 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 13 autocmod 2.5b [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.9   253P/2011 R2         1999.0   253P/1998 RS22        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-25 07:22 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin