Cometary Science Newsletter Issue 26 May 2017 http://www.cometarysciencenews.org/ - Small Bodies Planetary Astronomy Python Package - Refereed Journal Papers + JCMT Spectral and Continuum Imaging of Comet 252P/LINEAR, Coulson, I.M. et al. + Seasonal changes of the volatile density in the coma and on the surface of comet 67P/Churyumov-Gerasimenko, Kramer et al. + Physical and dynamical properties of the anomalous comet 249P/LINEAR, Fernández et al. + The Destruction of an Oort Cloud in a rich stellar cluster, Nordlander et al. -- The Cometary Science Newsletter is dedicated to sharing and furthering cometary science. CSN invites contributions from the astronomical and planetary science communities, including abstracts of papers accepted for publication in refereed journals, thesis abstracts, timely notes on particular comets, conference announcements, job announcements, or other relevant and brief scientific communications. Relevant topics include observational, theoretical, and laboratory work concerning comets, but also may include studies of associated phenomena, such as Centaurs, asteroid-comet transition objects, debris disks, and protoplanetary disks.