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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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:
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.disLast 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 ]
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