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JPL Small-Body Database Browser
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138P/Shoemaker-Levy 7
Classification: Jupiter-family Comet          SPK-ID: 1000137
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | 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 2453612.5 (2005-Aug-30.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5294518760783127 4.0298e-07  
a 3.628326437681936 1.5093e-07 au
q 1.707302198226694 1.4914e-06 au
i 10.07952060977841 4.6085e-05 deg
node 309.4417698756743 0.00011706 deg
peri 95.64910660338207 0.00017981 deg
M 5.860581634597394 6.9623e-05 deg
tp 2453571.404319544281
(2005-Jul-19.90431954)
0.00048715 TDB
period 2524.398751946602
6.91
0.00015751
4.312e-07
d
yr
n .1426082150145252 8.898e-09 deg/d
Q 5.549350677137179 2.3083e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -9.70461262058737E-11 2.247E-12
  Orbit Determination Parameters
   # obs. used (total)      100  
   data-arc span      9765 days (26.74 yr)  
   first obs. used      1991-11-13  
   last obs. used      2018-08-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58997  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2018-Sep-24 14:56:05  

Additional Information
 Earth MOID = .751048 au 
 Jupiter MOID = .897804 au 
 T_jup = 2.829 
[ 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 16.7   0.5 19 2 parameter fit from 45 observations, autocmod 2.6n
comet total magnitude slope K1 8.   n/a 19 autocmod 2.6n

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1998.6   138P/1998 O1       
 1991.7   138P/1991 V2   1991 XIX   1991d1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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