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138P/Shoemaker-Levy 7
Classification: Jupiter-family Comet          SPK-ID: 1000137
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]
Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).


:
Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5305272289353777 1.0282e-06  
a 3.621812002614595 3.258e-07 AU
q 1.700342117142583 3.7363e-06 AU
i 10.0855870317302 3.8171e-05 deg
node 309.3978567354816 0.00011753 deg
peri 95.59377683043907 0.00026031 deg
M 39.23017200425817 8.1759e-05 deg
tp 2456090.149981475251
(2012-Jun-11.64998147)
0.00056171 JED
period 2517.603202407301
6.89
0.00033971
9.301e-07
d
yr
n .1429931450896521 1.9295e-08 deg/d
Q 5.543281888086608 4.9865e-07 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -9.73586535740249E-11 2.289E-12
  Orbit Determination Parameters
   # obs. used (total)      96  
   data-arc span      7756 days (21.23 yr)  
   first obs. used      1991-11-13  
   last obs. used      2013-02-06  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .7433  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:45:44  

Additional Information
 Earth MOID = .743541 AU 
 T_jup = 2.829 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 14.0 mag n/a ICQ 2005 Handbook  
comet total magnitude slope K1 15.0   n/a ICQ 2005 Handbook  

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1998.7   138P/1998 O1       
 1991.8   138P/1991 V2   1991 XIX   1991d1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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