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Discovered in October 2010 by the LINEAR survey, P/2010 TO20 LINEAR-Grauer(LG) was initially classified as an inert Jupiter Trojan. Subsequentobservations obtained in October 2011 revealed LG to be a Jupiter-family comet.LG has one of the largest perihelia (q=5.1 AU) and lowest eccentricities(e=0.09) of the known JFCs. We report on observations of LG taken on 29 October2011 and numerical simulations of its orbital evolution. Analysis of our datareveals that LG has a small nucleus (<3 km in radius) with broadband colours(B-R=0.99+/-0.06 mag, V-R=0.47+/-0.06 mag) typical of JFCs. We find a modeldependent mass-loss rate close to 100 kg/s, most likely powered by water-icesublimation. Our numerical simulation indicate that the orbit of LG is unstableon very short (10 to 100 yr) timescales and suggest this object has recentlyevolved into its current location from a more distant, Centaur-type orbit. Theorbit, dynamics and activity of LG share similarities with the well known caseof comet 29P/Schwassmann-Wachmann 1.

Comet P/2010 TO20 LINEAR-Grauer as a Mini-29P/SW1