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Chen","submitted_at":"2014-02-26T03:57:07Z","abstract_excerpt":"P/2011 S1 (Gibbs) is an outer solar system comet or active Centaur with a similar orbit to that of the famous 29P/Schwassmann-Wachmann 1. P/2011 S1 (Gibbs) has been observed by the Pan-STARRS 1 (PS1) sky survey from 2010 to 2012. The resulting data allow us to perform multi-color studies of the nucleus and coma of the comet. Analysis of PS1 images reveals that P/2011 S1 (Gibbs) has a small nucleus $< 4$ km radius, with colors $g_{P1}-r_{P1} = 0.5 \\pm 0.02$, $r_{P1}-i_{P1} = 0.12 \\pm 0.02$ and $i_{P1}-z_{P1} = 0.46 \\pm 0.03$. 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