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P/2011 S1 (Gibbs) is an outer solar system comet or active Centaur with asimilar 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 to2012. The resulting data allow us to perform multi-color studies of the nucleusand coma of the comet. Analysis of PS1 images reveals that P/2011 S1 (Gibbs)has a small nucleus $< 4$ km radius, with colors $g_{P1}-r_{P1} = 0.5 \pm0.02$, $r_{P1}-i_{P1} = 0.12 \pm 0.02$ and $i_{P1}-z_{P1} = 0.46 \pm 0.03$. Thecomet remained active from 2010 to 2012, with a model-dependent mass-loss rateof $\sim100$ kg s$^{-1}$. The mass-loss rate per unit surface area of P/2011 S1(Gibbs) is as high as that of 29P/Schwassmann-Wachmann 1, making it one of themost active Centaurs. The mass-loss rate also varies with time from $\sim 40$kg s$^{-1}$ to 150 kg s$^{-1}$. Due to its rather circular orbit, we proposethat P/2011 S1 (Gibbs) has 29P/Schwassmann-Wachmann 1-like outbursts thatcontrol the outgassing rate. The results indicate that it may have a similarsurface composition to that of 29P/Schwassmann-Wachmann 1.  Our numerical simulations show that the future orbital evolution of P/2011 S1(Gibbs) is more similar to that of the main population of Centaurs than to thatof 29P/Schwassmann-Wachmann 1. The results also demonstrate that P/2011 S1(Gibbs) is dynamically unstable and can only remain near its current orbit forroughly a thousand years.

Pan-STARRS 1 observations of the unusual active Centaur P/2011 S1(Gibbs)