Search Publications

Comet C/2012 S1 (ISON) coma composition at ~4 au from HST observations

Mutchler, Max; Muinonen, Karri; Hines, Dean C. +10 more

We analyze the first color and polarization images of Comet ISON (C/2012 S1) taken during two measurement campaigns of the Hubble Space Telescope (HST) on UTC 2013 April 10 and May 8, when the phase angles of Comet ISON were α≈13.7° and 12.2°, respectively. We model the particles in the coma using highly irregular agglomerated debris particles. Ev…

Results from the worldwide coma morphology campaign for comet ISON (C/2012 S1)

Samarasinha, Nalin H.; Mueller, Beatrice E. A.; Schleicher, David G. +46 more

We present the results of a global coma morphology campaign for comet C/2012 S1 (ISON), which was organized to involve both professional and amateur observers. In response to the campaign, many hundreds of images, from nearly two dozen groups were collected. Images were taken primarily in the continuum, which help to characterize the behavior of d…