The Pinwheel Galaxy (also known as Messier 101M101 or NGC 5457) is a face-on spiral galaxy distanced 21 million light-years (six megaparsecs) away in the constellation Ursa Major, first discovered by Pierre Méchain on March 27, 1781, and communicated to Charles Messier who verified its position for inclusion in the Messier Catalogue as one of its final entries.
On February 28, 2006, NASA and the ESA released a very detailed image of the Pinwheel Galaxy, which was the largest and most detailed image of a galaxy by Hubble Space Telescope at the time. The image was composed from 51 individual exposures, plus some extra ground-based photos.
On August 24, 2011, a Type Ia supernova, SN 2011fe, was discovered in M101.

Imaging telescopes or lenses: Sky-Watcher ED80
Imaging cameras: Canon 1100D
Mounts: Sky-Watcher NEQ6 Pro SyncScan
Guiding telescopes or lenses: Finder 8×50
Guiding cameras: QHYCCD QHY 5
Software: Adobe Photoshop CC, AstroSurf IRIS v5.59, Pleaides Astrophoto Pixinsight LE
Dates: March 7, 2014
Frames: 16×600″ ISO800 bin 1×1
Integration: 2.7 hours
Darks: ~6
Flats: ~15
Bias: ~49

Author: Pavel Syrin
AstroPhotography of the day by SPONLI 22 Sep 2014