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JPL Small-Body Database Browser
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31P/Schwassmann-Wachmann 2
Classification: Jupiter-family Comet          SPK-ID: 1000080
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2455036.5 (2009-Jul-24.0) TDB
Reference: JPL K193/9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1922395282424168 1.1223e-07  
a 4.238753307140143 8.489e-08 au
q 3.423897371039538 4.7683e-07 au
i 4.547389831520283 1.1365e-05 deg
node 114.1871248763402 0.00011014 deg
peri 18.05125950723652 0.00012971 deg
M 311.0738668115935 5.0953e-05 deg
tp 2455469.705569789214
(2010-Sep-30.20556979)
0.00045304 TDB
period 3187.539970174299
8.73
9.5755e-05
2.622e-07
d
yr
n .1129397602441091 3.3928e-09 deg/d
Q 5.053609243240747 1.0121e-07 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.25612329602586E-8 1.71E-9
  Orbit Determination Parameters
   # obs. used (total)      850  
   data-arc span      6694 days (18.33 yr)  
   first obs. used      2000-11-24  
   last obs. used      2019-03-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .7785  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2019-May-15 16:37:31  

Additional Information
 Earth MOID = 2.43717 au 
 Jupiter MOID = .0592533 au 
 T_jup = 2.993 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 5.2   0.7 K193/9 2 parameter fit from 488 observations, autocmod 2.6q
comet total magnitude slope K1 21.   n/a K193/9 autocmod 2.6q
comet nuclear magnitude M2 14.0   0.6 K193/9 from 271 observations, autocmod 2.6q
comet nuclear magnitude slope K2 5.   n/a K193/9 autocmod 2.6q
comet nuclear phase coefficient PC 0.03   n/a K193/9 autocmod 2.6q
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 
 1993.3       1994 II   
 1984.6       1981 VI   1986h 
 1975.8       1974 XIII   1979k 
 1967.1       1968 II   1967i 
 1958.4       1955 I   1960j 
 1949.7       1948 VII   1954g 
 1940.9       1942 I   1941f 
 1932.2   31P/1929 B1   1929 I   1929a 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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