The Pinwheel Galaxy (M33) in Triangulum

Posted by Rod Pommier
on Sunday, November 16, 2014

Telescope: Celestron Compustar C14 with AstroPhysics 0.75x focal reducer (f/8.3)
Camera: SBIG STL 11000M with SBIG AO-L adaptive optics at 7 Hz and Baader Planetarium LRGB filters.
Location: Pommier Observatory, Portland, OR, USA
Dates: 2013-12-03 through 2013-12-07
Exposures: LRGB=360:100:100:100 minutes=15 hours total exposure

Although most people think of M33 as one object, it actually contains 4 nebulae large and bright enough to have their own NGC numbers and 10 star clouds with their own IC numbers. Nebula NGC 604 at the upper right of the image is one of the largest nebulae known, spanning an astounding 1500 light years. To take a tour of these objects see my article in the November, 2014 issue of Astronomy. This is the original image from which all the illustrations in the article were derived.

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