June 18, 2017

M27, Dumbbell Nebula (May 2017)

M27 is found in Vulpecula and is one of the best telescopic sights of summer.  I have "discovered" it many times: most notably in 11x80 binoculars from the desert east of Reno and with an 80mm refractor in Bear Lake, Idaho.  Here is what it looks like with a color camera from my backyard in The Woodlands, TX, with narrowband data added.  I gathered 9x720" in H-alpha and 8x720" in OIII with the SXVF-H9 and combined this with 25x360" taken with the SXVF-H9C.  Of course, this is the big scope, the CFF 290mm Classical Cassegrain, at an effective focal length of about f/8.  The filters are Astronomik.  Guiding was done with an SX-OAG on a Takahashi NJP.

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