+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   258P/PANSTARRS Classification: Jupiter-family Comet          SPK-ID: 1003186 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455394.5 (2010-Jul-17.0) TDB Reference: JPL 5 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2088044689741897 3.4733e-06   a 4.397399050947482 5.6116e-07 AU q 3.479202477246787 1.5225e-05 AU i 6.746250123051499 4.0275e-05 deg node 126.3448253039312 0.00073409 deg peri 25.82893209294095 0.0022715 deg M 333.8007460226713 0.0013359 deg tp 2455639.619955213335 (2011-Mar-19.11995521) 0.012497 JED period 3368.156358694835 9.22 0.00064473 1.765e-06 d yr n .1068833990057102 2.0459e-08 deg/d Q 5.315595624648177 6.7834e-07 AU   Orbit Determination Parameters    # obs. used (total)      35      data-arc span      3724 days (10.20 yr)      first obs. used      2002-03-11      last obs. used      2012-05-21      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      1      fit RMS      .46693      data source      ORB      producer      Otto Matic      solution date      2012-Jun-06 14:09:27   Additional Information  Earth MOID = 2.49123 AU   T_jup = 2.969  [ 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 12.4 mag 0.6 5 from 23 observations, assumed slope, autocmod 2.5b comet total magnitude slope K1 11.   n/a 5 autocmod 2.5b comet nuclear magnitude M2 16.1 mag 0.2 5 from 7 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 5 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 5 autocmod 2.5b [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.2   258P/2012 H1        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-Jun-20 01:52 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin