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129P/Shoemaker-Levy 3
Classification: Encke-type Comet          SPK-ID: 1000180
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2456717.5 (2014-Mar-01.0) TDB
Reference: JPL 62 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08748030452997145 3.9323e-07  
a 4.288925572099323 1.6345e-06 AU
q 3.913729056945692 2.2747e-06 AU
i 3.438152991200658 1.6562e-05 deg
node 184.9511187917157 0.00050813 deg
peri 309.5004090029561 0.00040527 deg
M 1.94113471411002 0.00020586 deg
tp 2456700.006594346351
(2014-Feb-11.50659435)
0.0018645 JED
period 3244.301381834286
8.88
0.0018546
5.078e-06
d
yr
n .1109637970182846 6.3434e-08 deg/d
Q 4.664122087252954 1.7775e-06 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.64568305508214E-8 4.84E-9
A2 [EST] -2.766777120388636E-8 3.834E-10
A3 [EST] -1.158787342255803E-8 2.559E-9
DT [EST] 237.2539291374667 25.54
  Orbit Determination Parameters
   # obs. used (total)      568  
   data-arc span      8398 days (22.99 yr)  
   first obs. used      1991-02-07  
   last obs. used      2014-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      1  
   fit RMS      .78863  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2014-Feb-19 12:02:38  

Additional Information
 Earth MOID = 2.92913 AU 
 T_jup = 3.019 
[ 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 11.5 mag 0.9 62 2 parameter fit from 336 observations, autocmod 2.5c
comet total magnitude slope K1 10.   n/a 62 autocmod 2.5c
comet nuclear magnitude M2 14.2 mag 0.8 62 from 87 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 62 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 62 autocmod 2.5c

129P/Shoemaker-Levy 3          Discovered 1991-Feb-07 by Shoemaker, Carolyn & Eugene, & Levy, D.H. at Palomar Mountain Observatory, California (675)
discovered on plate/photo taken on discovery date
Reference: comet.disLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1996.4   129P/1996 U1       
 1987.5   129P/1991 C1   1990 XXVII   1991e 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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