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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 2456140.5 (2012-Aug-01.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4281755715853681 8.2427e-08  
a 3.465487939578648 2.5422e-07 AU
q 1.981650660227361 3.5693e-07 AU
i 8.508415201215824 5.0467e-06 deg
node 151.7701853727449 3.7691e-05 deg
peri 302.1741670545564 5.244e-05 deg
M 143.7890253725979 2.1414e-05 deg
tp 2455199.329613667630
(2010-Jan-02.82961367)
8.6327e-05 JED
period 2356.378299398522
6.45
0.00025928
7.099e-07
d
yr
n .1527768270875232 1.6811e-08 deg/d
Q 4.949325218929935 3.6307e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 4.309324519344644E-9 1.007E-10
A2 [EST] -1.799045336590839E-9 5.244E-12
  Orbit Determination Parameters
   # obs. used (total)      2065  
   data-arc span      6237 days (17.08 yr)  
   first obs. used      1995-06-22  
   last obs. used      2012-07-19  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .88149  
   data source      ORB  
   producer      Alan B. Chamberlin  
   solution date      2012-Aug-02 17:03:34  

Additional Information
 Earth MOID = 1.01474 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. 49 2 parameter fit from 548 observations, autocmod 2.5b
comet total magnitude slope K1 13.   n/a 49 autocmod 2.5b
comet nuclear magnitude M2 13.9 mag 0.8 49 from 1194 observations, autocmod 2.5b
comet nuclear magnitude slope K2 5.   n/a 49 autocmod 2.5b
comet nuclear phase coefficient PC 0.03   n/a 49 autocmod 2.5b
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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