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

[ show orbit diagram ]
:
Orbital Elements at Epoch 2456364.5 (2013-Mar-13.0) TDB
Reference: JPL K084/11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1939049560064233 1.2854e-07  
a 4.246480086303573 5.7928e-08 AU
q 3.423066551986726 5.5102e-07 AU
i 4.546633992033895 1.3784e-05 deg
node 114.1548122753023 9.7233e-05 deg
peri 18.01931880463022 0.00010829 deg
M 100.7835205272671 1.8667e-05 deg
tp 2455469.693585515710
(2010-Sep-30.19358552)
0.00017159 JED
period 3196.259740968185
8.75
6.5402e-05
1.791e-07
d
yr
n .11263164735509 2.3047e-09 deg/d
Q 5.069893620620419 6.916e-08 AU

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 1.829839428080619E-8 4.936E-10
A2 [EST] -2.863799405272808E-9 2.154E-11
  Orbit Determination Parameters
   # obs. used (total)      935  
   data-arc span      9461 days (25.90 yr)  
   first obs. used      1986-06-26  
   last obs. used      2012-05-21  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      0  
   fit RMS      .99349  
   data source      ORB  
   producer      Ryan S. Park  
   solution date      2013-Mar-03 19:23:29  

Additional Information
 Earth MOID = 2.43779 AU 
 T_jup = 2.992 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 6.2 mag 0.7 K084/11 2 parameter fit from 511 observations, autocmod 2.5b
comet total magnitude slope K1 19.   n/a K084/11 autocmod 2.5b
comet nuclear magnitude M2 13.9 mag 0.6 K084/11 from 232 observations, autocmod 2.5b
comet nuclear magnitude slope K2 5.   n/a K084/11 autocmod 2.5b
comet nuclear phase coefficient PC 0.03   n/a K084/11 autocmod 2.5b
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 
 1993.2       1994 II   
 1984.5       1981 VI   1986h 
 1975.7       1974 XIII   1979k 
 1967.0       1968 II   1967i 
 1958.2       1955 I   1954g 
 1949.5       1948 VII   1947l 
 1940.7       1942 I   1941f 
 1932.0   31P/1929 B1   1929 I   1929a 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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