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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 ]

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:
Orbital Elements at Epoch 2455554.5 (2010-Dec-24.0) TDB
Reference: JPL K193/22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1929518908135903 8.9758e-08  
a 4.243010198765619 5.5635e-08 au
q 3.424313358172445 3.8138e-07 au
i 4.546486710364198 1.0226e-05 deg
node 114.1876326212957 0.00010851 deg
peri 17.93006801410605 0.00012624 deg
M 9.646646581597302 4.8237e-05 deg
tp 2455468.957210659360
(2010-Sep-29.45721066)
0.00042755 TDB
period 3192.342945514156
8.74
6.2788e-05
1.719e-07
d
yr
n .1127698390004958 2.218e-09 deg/d
Q 5.061707039358793 6.637e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.299019708240678E-8 1.484E-9
  Orbit Determination Parameters
   # obs. used (total)      1019  
   data-arc span      7492 days (20.51 yr)  
   first obs. used      2000-11-24  
   last obs. used      2021-05-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .75507  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-Jul-07 22:49:39  

Additional Information
 Earth MOID = 2.43939 au 
 Jupiter MOID = .0551647 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 7.2   0.7 K193/22 from 621 observations, assumed slope, autocmod 2.9c
comet total magnitude slope K1 17.5   n/a K193/22 autocmod 2.9c
comet nuclear magnitude M2 14.0   0.6 K193/22 from 291 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a K193/22 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a K193/22 autocmod 2.9c
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   
 1984.5       1981 VI   1986h 
 1975.8       1974 XIII   1979k 
 1967.0       1968 II   1967i 
 1958.3       1955 I   1960j 
 1949.6       1948 VII   1947l 
 1940.8       1942 I   1941f 
 1932.1   31P/1929 B1   1929 I   1929a 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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