+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   73P/Schwassmann-Wachmann 3-C Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000081 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2012-02-23.0] K114/1 (default) [epoch=2001-01-11.0] K013/57 [epoch=1995-10-10.0] SAO/1995 Orbital Elements at Epoch 2455980.5 (2012-Feb-23.0) TDB Reference: JPL K114/1 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6922258013072282 1.2472e-07   a 3.063468722115394 2.7904e-07 AU q .9428566311694347 4.4635e-07 AU i 11.37915705677313 2.9524e-06 deg node 69.84321690348189 1.1269e-05 deg peri 198.8705914205202 2.585e-05 deg M 23.73073531906494 1.9723e-05 deg tp 2455851.399686348570 (2011-Oct-16.89968635) 9.155e-05 JED period 1958.477573055924 5.36 0.00026759 7.326e-07 d yr n .1838162483720819 2.5115e-08 deg/d Q 5.184080813061352 4.722e-07 AU Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] 6.544631766354118E-9 3.712E-11 A2 [EST] 4.832373496932443E-10 1.635E-11 DT [EST] -12.17581160807467 .3937   Orbit Determination Parameters    # obs. used (total)      3223      data-arc span      5853 days (16.02 yr)      first obs. used      1995-12-15      last obs. used      2011-12-24      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .85683      data source      ORB      producer      Alan B. Chamberlin      solution date      2012-Feb-22 16:52:19   Additional Information  Earth MOID = .0383732 AU   T_jup = 2.784  [ 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 13.2 mag 1. K114/1 2 parameter fit from 624 observations, autocmod 2.5b comet total magnitude slope K1 9.   n/a K114/1 autocmod 2.5b 73P/Schwassmann-Wachmann 3-C          Discovered 1930-May-02 by Schwassmann, A. and Wachmann, A. A. at Hamburg Observatory, Germany discovered on plate/photo taken on discovery date Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-19 16:46 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin