+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   P/2011 U1 (PANSTARRS) Classification: Jupiter-family Comet          SPK-ID: 1003154 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455621.5 (2011-Mar-01.0) TDB Reference: JPL 7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4191207671288596 1.3475e-05   a 4.060960241075336 9.9447e-06 AU q 2.358927469556043 5.5485e-05 AU i 15.25043975881875 0.00011138 deg node 135.2037169180686 0.000317 deg peri 352.659186917578 0.0012529 deg M 302.6024506472248 0.00051121 deg tp 2456098.076235639350 (2012-Jun-19.57623564) 0.0057302 JED period 2989.107492650653 8.18 0.01098 3.006e-05 d yr n .1204372880149461 4.424e-07 deg/d Q 5.762993012594629 1.4113e-05 AU   Orbit Determination Parameters    # obs. used (total)      59      data-arc span      2903 days (7.95 yr)      first obs. used      2004-02-14      last obs. used      2012-01-26      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      2      fit RMS      .52164      data source      ORB      producer      Otto Matic      solution date      2012-Jan-27 19:50:38   Additional Information  Earth MOID = 1.37478 AU   T_jup = 2.829  [ 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 8.9 mag 0.4 7 2 parameter fit from 25 observations, autocmod 2.5b comet total magnitude slope K1 22.   n/a 7 autocmod 2.5b comet nuclear magnitude M2 16.6 mag 0.3 7 from 16 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 7 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 7 autocmod 2.5b [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2012.5   P/2011 U1        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-May-24 08:23 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin