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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 2457380.5 (2015-Dec-24.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4282051070326322 2.7859e-07  
a 3.462878805693899 3.9519e-07 au
q 1.980056416060709 1.1585e-06 au
i 8.514226706277981 5.2994e-06 deg
node 151.7278284466424 3.6654e-05 deg
peri 302.3246544406015 7.2209e-05 deg
M 333.0918387892916 6.9108e-05 deg
tp 2457556.428372674412
(2016-Jun-16.92837267)
0.00048066 JED
period 2353.71765713904
6.44
0.00040292
1.103e-06
d
yr
n .1529495260011698 2.6182e-08 deg/d
Q 4.945701195327088 5.6441e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 5.182837679399278E-9 4.861E-10
A2 [EST] -2.933809551282463E-9 3.88E-11
DT [EST] 123.3487583811394 9.409
  Orbit Determination Parameters
   # obs. used (total)      1973  
   data-arc span      4837 days (13.24 yr)  
   first obs. used      2002-08-19  
   last obs. used      2015-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .69356  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2015-Dec-14 12:54:33  

Additional Information
 Earth MOID = 1.01159 au 
 T_jup = 2.961 
[ 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 11.1 mag 1. 52 2 parameter fit from 547 observations, autocmod 2.6
comet total magnitude slope K1 12.   n/a 52 autocmod 2.6
comet nuclear magnitude M2 13.9 mag 0.8 52 from 1216 observations, autocmod 2.6
comet nuclear magnitude slope K2 5.   n/a 52 autocmod 2.6
comet nuclear phase coefficient PC 0.03   n/a 52 autocmod 2.6
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       
 1990.7   118P/1991 C2   1990 XII   1991f 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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