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118P/Shoemaker-Levy 4
Classification: Jupiter-family Comet          SPK-ID: 1000150
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456870.5 (2014-Aug-01.0) TDB
Reference: JPL 50 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4284008514317814 8.0701e-08  
a 3.46447388745636 2.5333e-07 AU
q 1.980290324306882 3.5378e-07 AU
i 8.513139576862198 5.0513e-06 deg
node 151.728670827085 3.7636e-05 deg
peri 302.2822800881896 5.1434e-05 deg
M 255.1892463177828 3.2002e-05 deg
tp 2457556.237197982709
(2016-Jun-16.73719798)
0.00028001 JED
period 2355.34410927206
6.45
0.00025835
7.073e-07
d
yr
n .1528439087022665 1.6765e-08 deg/d
Q 4.948657450605839 3.6186e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.445185871868745E-9 9.971E-11
A2 [EST] -1.803951620760579E-9 5.204E-12
  Orbit Determination Parameters
   # obs. used (total)      2069  
   data-arc span      6982 days (19.12 yr)  
   first obs. used      1995-06-22  
   last obs. used      2014-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .88504  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2014-Aug-07 14:34:51  

Additional Information
 Earth MOID = 1.0111 AU 
 T_jup = 2.960 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 10.4 mag 1. 50 2 parameter fit from 552 observations, autocmod 2.5c
comet total magnitude slope K1 13.   n/a 50 autocmod 2.5c
comet nuclear magnitude M2 13.9 mag 0.8 50 from 1194 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 50 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 50 autocmod 2.5c
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 (675)
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       
 1990.7   118P/1991 C2   1990 XII   1991f 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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