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Don Reed | all galleries >> Galleries >> Astrophotography > M101 again
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23 May 2019 Don Reed

M101 again

I photographed M101 (the Pinwheel Galaxy) a year ago.

Located about 25 million light years from Earth and appearing in the northern constellation Ursa Major, the Pinwheel Galaxy is about 170,000 light years across, and is estimated to contain at least one trillion stars. It is one of the most interesting deep sky objects in the night sky during the northern hemisphere's late spring galaxy season, and at my latitude in the southern US, M101 is circumpolar, meaning it never goes below the horizon. So here it is again:

Image acquisition date: 22-May-2019 thru 23-May-2019
Seeing: average
Transparency: variable, mostly average

Imaging telescope: Astro Tech AT8IN (8" f/4 Newtonian reflector)
Imaging filter(s): Baader UV-IR cut
Imaging cameras: ZWO ASI071MC Pro
Imaging camera gain (e/adu): 0.5
Sensor temperature: 0 C
Anti-dew heater: On

Guiding telescope: 60mm f/4 refractor
Guiding camera: ZWO ASI224MC
Guiding software: PHD2 Guiding

Mount: Atlas EQ-G
Mount control software: EQMOD, Cartes du Ciel

Capture software: Sequence Generator Pro, version (beta)
Sub-exposures: 43 x 120 seconds / 69 x 60 seconds
Total integration time: 87.5 minutes
Flat frames: 40
Dark frames: none

Image processing software: PixInsight, version


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