M101 (Pinwheel Galaxy)

All Images Copyright Steve Cannistra

Please click here for a medium sized view (40%)

RA (J2000): 14h 3m 10s
Dec (J2000): 54 degrees 21' 45"
Position Angle (Pinpoint):  plus 90 degrees

M101 is a large, beautiful spiral galaxy in Ursa Major.  For visual observation, M101 is best seen using a low power eyepiece under dark skies.  Despite being relatively bright at magnitude 8.5, it has low surface brightest due to its large size.  There are many smaller, faint galaxies in this FOV.  More information about M101 may be found here.

Photographic Details:
Date:  March 6, 2010 (LRGB); March 27 (Ha)
Scope:  Vixen VC200L at f6.4 on the Takahashi NJP Mount
Autoguider:  SBIG ST-402
Camera:  ST8300 -20C

Astronomik Clear (unblocked), R, G, B filters
Exposures:  Clear 44 x 5' = 220'; R 8' x 7 = 56'; G 10' x 6 = 60'; B 15' x 6 = 90'; Ha 420'.  Total exposure 7.1 hours (LRGB)
Post-processing:  Calibrated in Maxim, aligned and stacked using DeepSkyStacker, followed by DDP in ImagesPlus (IP).  Further processing in Photoshop CS4.  Ha was obtained on March 27 and added to red channel in order to boost the HII regions.
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