+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   228P/LINEAR Classification: Jupiter-family Comet          SPK-ID: 1000381 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455448.5 (2010-Sep-09.0) TDB Reference: JPL 69 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1766454332532139 1.6858e-07   a 4.166353390255733 8.6527e-08 au q 3.430386090548013 7.1389e-07 au i 7.915416588600387 1.1034e-05 deg node 31.06750998857755 0.00010796 deg peri 114.8462918360202 0.00013835 deg M 319.5287437093379 6.811e-05 deg tp 2455797.702036631235 (2011-Aug-24.20203663) 0.0005906 TDB period 3106.222655515892 8.50 9.6765e-05 2.649e-07 d yr n .115896392475513 3.6104e-09 deg/d Q 4.902320689963454 1.0181e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A2 [EST] -1.045374841907068E-10 3.933E-12 ALN [SET] .0408373333128795 n/a NK [SET] 2.6 n/a NM [SET] 2. n/a NN [SET] 3. n/a R0 [SET] 5. n/a   Orbit Determination Parameters    # obs. used (total)      402      data-arc span      6741 days (18.46 yr)      first obs. used      2001-12-09      last obs. used      2020-05-24      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .77186      source      ORB      producer      Otto Matic      solution date      2020-Jun-02 00:45:32   Additional Information  Earth MOID = 2.45123 au   Jupiter MOID = .325786 au   T_jup = 2.994  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 9.7   0.6 69 2 parameter fit from 264 observations, autocmod 2.8 comet total magnitude slope K1 13.75   n/a 69 autocmod 2.8 comet nuclear magnitude M2 14.4   0.5 69 from 84 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 69 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 69 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.6   228P/2009 U2         2003.1   228P/2001 YX127        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-07 09:46 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin