+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   118P/Shoemaker-Levy 4 Classification: Jupiter-family Comet          SPK-ID: 1000150 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2011-Mar-16.0] K162/7 (default) [epoch=2007-Oct-02.0] K103/1 [epoch=2002-Oct-10.0] K033/1 [epoch=1997-Feb-01.0] SAO/1997 [epoch=1990-Jul-08.0] SAO/1990 Orbital Elements at Epoch 2455636.5 (2011-Mar-16.0) TDB Reference: JPL K162/7 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4276928306674881 2.7794e-07   a 3.465887004911417 7.2295e-07 au q 1.983551981007191 5.9843e-07 au i 8.508598912999116 5.6848e-06 deg node 151.8029060423584 4.6864e-05 deg peri 302.1455444899108 6.6768e-05 deg M 66.84952023809885 2.4496e-05 deg tp 2455198.861198062070 (2010-Jan-02.36119806) 0.00026908 TDB period 2356.785331241076 6.45 0.0007374 2.019e-06 d yr n .1527504415560942 4.7793e-08 deg/d Q 4.948222028815644 1.0321e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -7.874204687865599E-9 2.045E-10 A2 [EST] -2.278129851741168E-9 1.467E-10 DT [EST] 224.050256260166 13.85   Orbit Determination Parameters    # obs. used (total)      1708      data-arc span      3147 days (8.62 yr)      first obs. used      2008-09-20      last obs. used      2017-05-03      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .60025      source      ORB      producer      Davide Farnocchia      solution date      2017-Oct-10 11:28:18   Additional Information  Earth MOID = 1.01522 au   Jupiter MOID = .626011 au   T_jup = 2.961  [ 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 10.7   0.9 K162/7 2 parameter fit from 398 observations, autocmod 2.6k comet total magnitude slope K1 14.   n/a K162/7 autocmod 2.6k comet nuclear magnitude M2 14.1   0.7 K162/7 from 1200 observations, autocmod 2.6k comet nuclear magnitude slope K2 5.   n/a K162/7 autocmod 2.6k comet nuclear phase coefficient PC 0.03   n/a K162/7 autocmod 2.6k diameter diameter 4.8 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264   118P/Shoemaker-Levy 4          Discovered 1991-Feb-09 by Shoemaker, Carolyn & Eugene, & Levy, D. H. at Palomar Mountain Observatory, California discovered on plate/photo taken on discovery date as well as 2/11 Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1997.1   118P/1995 M1         1990.6   118P/1991 C2   1990 XII   1991f  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 00:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin