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We present analysis of {\it Hubble Space Telescope} (HST) observations ofCentaur 29P/Schwassmann-Wachmann 1 (SW1) while in outburst to characterize theoutburst coma and place constraints on the nucleus' spin state. Theobservations consist of Wide Field and Planetary Camera 2 (WFPC2) images fromCycle 5, GO-5829 (Feldman (1995)) acquired on UT 1996 March 11.3 and 12.1,which serendipitously imaged the Centaur shortly after a major outburst. Amulti-component coma was detected consisting of: an expanding outburst dustcoma with complex morphology possessing an east-west asymmetry and north-southsymmetry contained within 5$''$ ($\sim$19,000 km) of the nucleus, the residualdust shell of an earlier UT 1996 February outburst, and a nearly circularunderlying quiescent activity level coma detectable to $\sim$70$''$($\sim$267,000 km) away from the nucleus. Photometry of the calibrated WFPC2images resulted in a measured 5$''$ radius aperture equivalent R-band magnitudeof 12.86 $\pm$ 0.02 and an estimated (2.79 $\pm$ 0.05)$\times 10^8$ kg for thelower limit of dust material emitted during the outburst. No appreciableevolution of morphologic features, indicating signatures of nucleus rotation,were detected between the two imaging epochs. The observations were modeledusing a 3-D Monte Carlo coma model (Samarasinha (2000)) to place constraints onthe nucleus' rotation state. Modeling indicated the morphology isrepresentative of a non-isotropic ejection of dust emitted during a singleoutburst event with a duration on the order of hours from a single sourceregion corresponding to $\sim$1\% of the surface area. A spin period with lowerlimit on the order of days is suggested to reproduce the coma morphology seenin the observations.

Analysis of HST WFPC2 Observations of Centaur 29P/Schwassmann-Wachmann 1 while in Outburst to Place Constraints on the Nucleus' Rotation State