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JPL Small-Body Database Browser
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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 
[ 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 K193/13 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1926-May-22 14:11 4_04:28 Jupiter 0.304718902733886 0.288169899893739 0.321123312090612 3.7621764643437 2.93165517405318 2424658.091143553 6028.25673777199 698457.216304794 283.12478009229 -17.4531785322296 73302.0283575892 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
1937-Oct-28 16:28 2_13:57 Jupiter 1.97921379159563 1.95139147020082 2.0070428972959 8.71076931725401 8.66150009732458 2428835.185792186 3716.85603536751 1399584.17688709 682.046397281254 -10.2934909038587 39606.9766918227 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
1997-Mar-18 10:50 00:07 Jupiter 0.246234621363366 0.246223158719582 0.246246084035648 3.76906613550683 2.7066693914224 2450525.951231858 6.5461126135739 571.615424065458 87.4613187683196 -27.8683666444267 188562.169004239 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2030-Mar-29 11:02 00:09 Jupiter 1.36332073085728 1.36331351069145 1.36332795100814 1.90959470199466 1.55047238664793 2462589.960024409 8.83721758549834 818.964297750834 85.8983404472502 -55.7622580752976 464201.727719202 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2033-Nov-28 03:34 00:04 Jupiter 0.838847373953391 0.83882935011913 0.83886539777082 4.38517284281509 4.14852377266297 2463929.648596562 3.98039648538133 876.970390480896 113.275139962385 14.628690891981 201045.858950104 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2053-Jul-27 03:34 00:45 Jupiter 1.9652191374981 1.96518244893415 1.96525582618895 3.71990594320627 3.60217808103398 2471110.648807953 44.8314277174139 2015.95503571805 122.916641384395 41.479533993495 343363.024188621 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2057-May-24 09:07 00:42 Jupiter 1.91186899077654 1.91171823042334 1.91201975107941 7.43745743888066 7.37764905824243 2472507.880135808 41.8080918367949 7501.53753350545 109.715240847489 6.61745925062756 152705.331778181 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2115-Oct-27 10:28 01:11 Jupiter 0.866708380548947 0.864845893224156 0.868570454188626 4.78795682020608 4.57929658837861 2493846.936309473 70.5986801551749 87607.27034323 117.783494025947 0.737131309295962 1153.20279954865 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2119-Jul-08 23:12 02:50 Jupiter 1.43295152815344 1.43149841604743 1.43440390397817 2.71860112018296 2.49170328429477 2495197.466697128 170.059288815376 51353.5159217639 157.348611006035 -17.4017608257502 102745.62252386 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32
2176-Mar-24 15:55 7_21:50 Jupiter 0.321083793205338 0.28825671682404 0.354266385855691 3.51465275517505 2.66021848337989 2515911.163024495 11390.2878823618 1697459.41453519 119.773737570417 40.5070855784088 147209.230185189 T K193/13 CATAB v2.0f-lin.ifort 2020-Apr-03 12:32:10 2020-Apr-03 12:32

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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