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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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:
Orbital Elements at Epoch 2455162.5 (2009-Nov-27.0) TDB
Reference: JPL K193/12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1923761689172221 1.0502e-07  
a 4.239743056068873 7.9608e-08 au
q 3.424117529748948 4.4708e-07 au
i 4.547250878205253 1.1225e-05 deg
node 114.1886363733067 0.00010987 deg
peri 18.00595414977927 0.00012944 deg
M 325.347676403265 5.094e-05 deg
tp 2455469.428766335306
(2010-Sep-29.92876634)
0.00045252 TDB
period 3188.656471253812
8.73
8.9808e-05
2.459e-07
d
yr
n .1129002146344239 3.1798e-09 deg/d
Q 5.055368582388798 9.4922e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.241041156521413E-8 1.629E-9
  Orbit Determination Parameters
   # obs. used (total)      886  
   data-arc span      7011 days (19.20 yr)  
   first obs. used      2000-11-24  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .77132  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2020-Feb-11 16:34:05  

Additional Information
 Earth MOID = 2.43968 au 
 Jupiter MOID = .0581938 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 K193/12 2 parameter fit from 513 observations, autocmod 2.8
comet total magnitude slope K1 21.   n/a K193/12 autocmod 2.8
comet nuclear magnitude M2 14.0   0.6 K193/12 from 277 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K193/12 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K193/12 autocmod 2.8
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 
 1949.6       1948 VII   1947l 
 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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