+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   104P/Kowal 2 Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000056 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2016-Jul-31.0] K163/6 (default) [epoch=2004-Mar-16.0] K043/16 [epoch=1991-Oct-31.0] SAO/1991 [epoch=1979-Jan-07.0] SAO/1979 [epoch=1972-Jul-22.0] SAO/1972 Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB Reference: JPL K163/6 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6386695859566606 1.0383e-05   a 3.263280361225389 7.9121e-05 au q 1.179122444061068 5.6702e-06 au i 10.25426992139334 0.00010851 deg node 235.4207637354207 0.00093497 deg peri 200.6739477005111 0.0007769 deg M 20.87399485947891 0.00068891 deg tp 2457475.651571746826 (2016-Mar-28.15157175) 0.00059915 TDB period 2153.178367327846 5.90 0.078309 0.0002144 d yr n .1671946948114522 6.0807e-06 deg/d Q 5.34743827838971 0.00012965 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 2.200273266754491E-8 2.289E-9 A2 [EST] -1.05737556441448E-10 3.003E-10 A3 [EST] 4.296959281020488E-9 6.48E-10 DT [EST] 61.95449595727518 4.789   Orbit Determination Parameters    # obs. used (total)      133      data-arc span      4685 days (12.83 yr)      first obs. used      2003-08-31      last obs. used      2016-06-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      condition code      4      norm. resid. RMS      .71301      source      ORB      producer      Davide Farnocchia      solution date      2016-Aug-16 17:08:46   Additional Information  Earth MOID = .20043 au   Jupiter MOID = .168654 au   T_jup = 2.794  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.4   1. K163/6 2 parameter fit from 36 observations, autocmod 2.6g comet total magnitude slope K1 16.   n/a K163/6 autocmod 2.6g diameter diameter 2.0 km n/a Lamy,P.L ,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   104P/Kowal 2          Discovered 1979-Jan-27 by Kowal, Charles T. at Palomar Mountain Observatory, California discovered on plate/photo taken on discovery date as well as 1/28,29 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1992.7   104P/1991 X1   1991 XX   1991f1   1980.9   104P/1979 B1   1979 II   1979a  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-05 11:45 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin