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181P/Shoemaker-Levy 6
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000136
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456908.5 (2014-Sep-08.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7073228278805144 3.5938e-07  
a 3.839018373459053 4.1604e-06 au
q 1.123593041258743 9.6028e-07 au
i 16.98117916666919 6.1399e-05 deg
node 37.6794577153227 0.00011055 deg
peri 333.7988485602352 0.00051519 deg
M 11.75008853224812 8.4115e-05 deg
tp 2456818.825833040463
(2014-Jun-10.32583304)
0.00051162 TDB
period 2747.44313771198
7.52
0.0044661
1.223e-05
d
yr
n .1310309192785701 2.13e-07 deg/d
Q 6.554443705659363 7.1031e-06 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] -2.912547448601831E-9 3.989E-10
A2 [EST] -8.638449566027108E-11 7.527E-13
  Orbit Determination Parameters
   # obs. used (total)      88  
   data-arc span      8252 days (22.59 yr)  
   first obs. used      1991-11-11  
   last obs. used      2014-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      2  
   norm. resid. RMS      1.1117  
   source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Aug-29 13:06:38  

Additional Information
 Earth MOID = .156355 au 
 T_jup = 2.517 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 16.3   1. 16 from 43 observations, assumed slope, autocmod 2.5c
comet total magnitude slope K1 17.   n/a 16 autocmod 2.5c
comet nuclear magnitude M2 19.3   0.8 16 from 25 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 16 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 16 autocmod 2.5c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2006.9   181P/2006 U4       
 1991.9   181P/1991 V1   1991 XVIII   1991b1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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