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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 2455519.5 (2010-Nov-19.0) TDB
Reference: JPL K193/20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1928816065088364 9.1075e-08  
a 4.242644592056441 5.1974e-08 au
q 3.424316487294568 3.8807e-07 au
i 4.546588725017729 1.037e-05 deg
node 114.1883629970298 0.00010925 deg
peri 17.92942925321878 0.00012863 deg
M 5.700608668425044 5.0739e-05 deg
tp 2455468.955706155045
(2010-Sep-29.45570615)
0.00044978 TDB
period 3191.930343327873
8.74
5.8654e-05
1.606e-07
d
yr
n .1127844160987134 2.0725e-09 deg/d
Q 5.060972696818314 6.1999e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.324836119346194E-8 1.489E-9
  Orbit Determination Parameters
   # obs. used (total)      1004  
   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      .75926  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2021-Mar-23 23:56:05  

Additional Information
 Earth MOID = 2.44007 au 
 Jupiter MOID = .0555264 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 K193/20 2 parameter fit from 606 observations, autocmod 2.9b
comet total magnitude slope K1 21.25   n/a K193/20 autocmod 2.9b
comet nuclear magnitude M2 14.0   0.6 K193/20 from 291 observations, autocmod 2.9b
comet nuclear magnitude slope K2 5.   n/a K193/20 autocmod 2.9b
comet nuclear phase coefficient PC 0.03   n/a K193/20 autocmod 2.9b
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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