Object: Messier 101, NGC 5457Type: Galaxy
Distance: 17.5 million light years
Constellation: Ursa Major
Date: 17 April 2007
Equipment: SXV-H9, Vixen ED114 refractor (f.l. 600mm)
Subframes: 60 x 90s 2x2 binned subframes, 16 darks, 16 flats/flat darks, calibrated and stacked in AIP4Win.
My notes record that this wasn't the greatest night for imaging, as a high haze set in whilst I was setting up. Nevertheless, the brighter inner coils of this galaxy (whose full apparent diameter in the sky is nearly that of the full moon) can be seen quite well.
Deeper exposures, such as this one by Johannes Schedler, give the impression of a celestial catherine wheel struggling to hold on to its outer reaches.
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