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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 ]

[ show orbit diagram ]
:
Orbital Elements at Epoch 2455350.5 (2010-Jun-03.0) TDB
Reference: JPL K193/13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1926182129235241 9.5022e-08  
a 4.24122761002134 5.9582e-08 au
q 3.42428992717712 4.0635e-07 au
i 4.546983376709354 1.0793e-05 deg
node 114.1896057384976 0.00010973 deg
peri 17.95707857468643 0.00012915 deg
M 346.6139102487927 5.0861e-05 deg
tp 2455469.127950854663
(2010-Sep-29.62795085)
0.00045116 TDB
period 3190.33138888278
8.73
6.7228e-05
1.841e-07
d
yr
n .112840942246463 2.3778e-09 deg/d
Q 5.058165292865559 7.1058e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -5.18111382357065E-8 1.531E-9
  Orbit Determination Parameters
   # obs. used (total)      947  
   data-arc span      7052 days (19.31 yr)  
   first obs. used      2000-11-24  
   last obs. used      2020-03-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .75711  
   source      ORB  
   producer      Shantanu Naidu  
   solution date      2020-Apr-03 12:30:42  

Additional Information
 Earth MOID = 2.44006 au 
 Jupiter MOID = .056727 au 
 T_jup = 2.993 
[ hide covariance matrix ]
Orbit Covariance (7×7)
  e q tp node peri i A2
e 9.029226204868219E-15 -3.834063142094933E-14 6.925305075999405E-12 -1.036746190746871E-13 1.031797981306868E-12 -1.511083697672855E-14 -1.733675480057189E-17
q -3.834063142094933E-14 1.651189675983202E-13 -2.559686248378028E-11 4.354387364688691E-13 -3.962474204219575E-12 5.623317733493294E-14 3.861935170147066E-17
tp 6.925305075999405E-12 -2.559686248378028E-11 2.035416010512906E-7 8.807006775151412E-10 3.061511523429864E-8 -7.149224925429187E-11 -8.307408455133993E-14
node -1.036746190746871E-13 4.354387364688691E-13 8.807006775151412E-10 1.203959604503678E-8 -1.187547756074762E-8 4.421863292045906E-10 -5.900593237330026E-16
peri 1.031797981306868E-12 -3.962474204219575E-12 3.061511523429864E-8 -1.187547756074762E-8 1.668019152267583E-8 -4.482889779791615E-10 -1.473584372389639E-15
i -1.511083697672855E-14 5.623317733493294E-14 -7.149224925429187E-11 4.421863292045906E-10 -4.482889779791615E-10 1.164876055627073E-10 4.53444304423167E-16
A2 -1.733675480057189E-17 3.861935170147066E-17 -8.307408455133993E-14 -5.900593237330026E-16 -1.473584372389639E-15 4.53444304423167E-16 2.344303442312117E-18

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 K193/13 2 parameter fit from 563 observations, autocmod 2.8
comet total magnitude slope K1 21.   n/a K193/13 autocmod 2.8
comet nuclear magnitude M2 14.0   0.6 K193/13 from 282 observations, autocmod 2.8
comet nuclear magnitude slope K2 5.   n/a K193/13 autocmod 2.8
comet nuclear phase coefficient PC 0.03   n/a K193/13 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   
 1984.5       1981 VI   1986h 
 1975.8       1974 XIII   1979k 
 1967.1       1968 II   1967i 
 1958.3       1955 I   1960j 
 1949.6       1948 VII   1947l 
 1940.9       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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