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We present observations using the Baade Magellan and Canada-France-Hawaiitelescopes showing that main-belt comet 324P/La Sagra, formerly known as P/2010R2, has become active again for the first time since originally observed to beactive in 2010-2011. The object appears point-source-like in March and April2015 as it approached perihelion (true anomaly of ~300 deg), but was ~1 magbrighter than expected if inactive, suggesting the presence of unresolved dustemission. Activity was confirmed by observations of a cometary dust tail in Mayand June 2015. We find an apparent net dust production rate of <0.1 kg/s duringthese observations. 324P is now the fourth main-belt comet confirmed to berecurrently active, a strong indication that its activity is driven bysublimation. It now has the largest confirmed active range of all likelymain-belt comets, and also the most distant confirmed inbound activation pointat R~2.8 AU. Further observations during the current active period will allowdirect comparisons of activity strength with 324P's 2010 activity.

The Reactivation of Main-Belt Comet 324P/La Sagra (P/2010 R2)