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31P/Schwassmann-Wachmann 2
Classification: Jupiter-family Comet          SPK-ID: 1000080
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 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL K084/11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1939049560064233 1.2854e-07  
a 4.246480086303573 5.7928e-08 AU
q 3.423066551986726 5.5102e-07 AU
i 4.546633992033895 1.3784e-05 deg
node 114.1548122753023 9.7233e-05 deg
peri 18.01931880463022 0.00010829 deg
M 100.7835205272671 1.8667e-05 deg
tp 2455469.693585515710
(2010-Sep-30.19358552)
0.00017159 JED
period 3196.259740968185
8.75
6.5402e-05
1.791e-07
d
yr
n .11263164735509 2.3047e-09 deg/d
Q 5.069893620620419 6.916e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.829839428080619E-8 4.936E-10
A2 [EST] -2.863799405272808E-9 2.154E-11
  Orbit Determination Parameters
   # obs. used (total)      935  
   data-arc span      9461 days (25.90 yr)  
   first obs. used      1986-06-26  
   last obs. used      2012-05-21  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .99349  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:23:29  

Additional Information
 Earth MOID = 2.43779 AU 
 T_jup = 2.992 
[ 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 6.2 mag 0.7 K084/11 2 parameter fit from 511 observations, autocmod 2.5b
comet total magnitude slope K1 19.   n/a K084/11 autocmod 2.5b
comet nuclear magnitude M2 13.9 mag 0.6 K084/11 from 232 observations, autocmod 2.5b
comet nuclear magnitude slope K2 5.   n/a K084/11 autocmod 2.5b
comet nuclear phase coefficient PC 0.03   n/a K084/11 autocmod 2.5b
diameter diameter 6.2 km n/a Lamy,P.L.,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (2004) Comets II, pp. 223-264  

31P/Schwassmann-Wachmann 2          Discovered 1929-Jan-17 by Schwassmann, A. and Wachmann, A. A. at Hamburg Observatory, Germany
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 
 1993.2       1994 II   
 1984.5       1981 VI   1986h 
 1975.7       1974 XIII   1979k 
 1967.0       1968 II   1967i 
 1958.2       1955 I   1954g 
 1949.5       1948 VII   1947l 
 1940.7       1942 I   1941f 
 1932.0   31P/1929 B1   1929 I   1929a 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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