+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   172P/Yeung Classification: Jupiter-family Comet          SPK-ID: 1000388 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2454149.5 (2007-Feb-18.0) TDB Reference: JPL 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3621007120702608 1.3821e-07   a 3.5130838186666 1.3532e-07 AU q 2.240993666364913 5.4146e-07 AU i 11.51794934719301 1.2513e-05 deg node 40.10496753951557 7.7432e-05 deg peri 178.9076876105346 8.1545e-05 deg M 269.8045558342755 2.2843e-05 deg tp 2454752.078032857917 (2008-Oct-12.57803286) 0.00017437 JED period 2405.089235219773 6.58 0.00013896 3.805e-07 d yr n .1496825958589032 8.6486e-09 deg/d Q 4.785173970968287 1.8432e-07 AU   Orbit Determination Parameters    # obs. used (total)      363      data-arc span      6971 days (19.09 yr)      first obs. used      1993-10-20      last obs. used      2012-11-20      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .55549      data source      ORB      producer      Otto Matic      solution date      2013-Jan-06 14:51:37   Additional Information  Earth MOID = 1.23302 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 11.9 mag 01. 40 from 219 observations, assumed slope, autocmod 2.5b comet total magnitude slope K1 11.   n/a 40 autocmod 2.5b comet nuclear magnitude M2 15.4 mag 1. 40 from 111 observations, autocmod 2.5b comet nuclear magnitude slope K2 5.   n/a 40 autocmod 2.5b comet nuclear phase coefficient PC 0.03   n/a 40 autocmod 2.5b [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2002.2   172P/2001 CB40        [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2013-Jun-20 00:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin