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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 2455509.5 (2010-Nov-09.0) TDB
Reference: JPL K193/19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1928610552519618 9.132e-08  
a 4.242538135556458 5.1382e-08 au
q 3.424317753786349 3.8887e-07 au
i 4.546617685676369 1.0384e-05 deg
node 114.1885381465665 0.00010972 deg
peri 17.92986529995997 0.00012904 deg
M 4.572576746043542 5.0775e-05 deg
tp 2455468.958896871199
(2010-Sep-29.45889687)
0.0004501 TDB
period 3191.810206137409
8.74
5.7985e-05
1.588e-07
d
yr
n .1127886612141818 2.049e-09 deg/d
Q 5.060758517326567 6.1292e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.33348501397671E-8 1.492E-9
  Orbit Determination Parameters
   # obs. used (total)      1000  
   data-arc span      7121 days (19.50 yr)  
   first obs. used      2000-11-24  
   last obs. used      2020-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .75955  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2020-Jun-18 00:14:21  

Additional Information
 Earth MOID = 2.43883 au 
 Jupiter MOID = .0556285 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 5.1   0.7 K193/19 2 parameter fit from 602 observations, autocmod 2.8
comet total magnitude slope K1 21.25   n/a K193/19 autocmod 2.8
comet nuclear magnitude M2 14.0   0.6 K193/19 from 291 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K193/19 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K193/19 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

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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 
 1967.1       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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