M33, Triangulum (Pinwheel) Galaxy, 19 Sep 2012 (David Dearden)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: M 33 · NGC 595 · NGC 598 · NGC 604 · Triangulum Galaxy · Triangulum Pinwheel

M33, Triangulum (Pinwheel) Galaxy, 19 Sep 2012, David Dearden

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M33, Triangulum (Pinwheel) Galaxy, 19 Sep 2012

M33 is a fairly easy find, and I found it fairly low on the horizon as I want to image up to the meridian and then bring in the scope so I can water Mapleton Lateral Observatory (my back yard!). I can see M33 with 1 sec exposures in both the guide scope and the imaging scope. This is my first use of the coma corrector+focal reducer combination. Occasional light wind. Still some smoke in the air, but not as much as last night so it is getting better. Medium dither, settling at 0.5. Cooler power supply still pending, so I'm starting the run at 20 °C and planning to use a bad pixel map again. There’s still what appears to be coma on the left side of the image. I wonder if my collimation was a bit off?

In the revision I just boosted the saturation another 35% in CS6.

Date: 19 Sep 2012

Subject: M33, Triangulum (Pinwheel) Galaxy

Scope: AT8IN+High Point Scientific coma corrector + 0.5x Antares telereducer

Filter: None

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + DSI Ic + PHD

Camera: DSI IIc (no cooling)

Acquisition: Nebulosity 3.1.1, medium RA-only dither

Exposure: 31 x 300 s

Stacking: Neb 3, bad pixel map, bias included, normalize first, trans+rot align, 1.5 SD stack

Processing: Digital development with weak sharpening, curves, power stretch, GreyCStoration, star reduction, 2 pixel unsharp mask, saturation boost in Neb 3; CS6 curves & levels, Astronomy Tools color blotch, deep space, space noise reduction. 2 pixel unsharp mask, star color enhance, “less crunchy more fuzzy” in Astronomy Tools.

Final
Original
B

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Astrometry.net job	8130674
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