+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   220P/McNaught Classification: Jupiter-family Comet          SPK-ID: 1000498 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455808.5 (2011-Sep-04.0) TDB Reference: JPL 52 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .5022047919070708 1.016e-07   a 3.113058173805873 9.3281e-08 au q 1.549665441435089 3.4783e-07 au i 8.13174540962458 1.0546e-05 deg node 150.122167075099 0.00013216 deg peri 180.7544335927493 0.000137 deg M 112.6431509083299 2.405e-05 deg tp 2455180.757444551365 (2009-Dec-15.25744455) 0.00013654 TDB period 2006.223353476851 5.49 9.0173e-05 2.469e-07 d yr n .1794416356364849 8.0653e-09 deg/d Q 4.676450906176658 1.4013e-07 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 1.779526805796733E-10 8.337E-11 A2 [EST] -1.343652001296701E-11 1.161E-12   Orbit Determination Parameters    # obs. used (total)      476      data-arc span      6042 days (16.54 yr)      first obs. used      2004-05-20      last obs. used      2020-12-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .61943      source      ORB      producer      Otto Matic      solution date      2021-Feb-03 09:44:31   Additional Information  Earth MOID = .538333 au   Jupiter MOID = .714987 au   T_jup = 2.996  [ 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 15.7   0.7 52 2 parameter fit from 307 observations, autocmod 2.8 comet total magnitude slope K1 10.5   n/a 52 autocmod 2.8 comet nuclear magnitude M2 17.8   0.5 52 from 93 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 52 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 52 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2010.0   220P/2009 H2         2004.5   220P/2004 K2        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-05 10:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin