M33, Triangulum Pinwheel Galaxy, UHC-S (OSC), 11 Sep 2015 (David Dearden)

M33, Triangulum Pinwheel Galaxy, UHC-S (OSC), 11 Sep 2015

Excellent conditions: perfect clarity, no wind. I played around with mount balance while waiting for Triangulum to rise and thought I had found a good set of conditions, but when I started imaging the RA guiding was still lousy. I'm not sure what I can do to fix this, but I might try guiding at a lower rate instead of the 1x sidereal I have always used. Synched from α And and was right on.

Date: 11 Sep 2015

Subject: M33, Triangulum Pinwheel Galaxy

Scope: AT8IN + Antares 0.5x Telereducer

Filter: Baader UHC-S

Mount: CG-5 (Synta motors, PicGoto Simplificado)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.5.0.1 (Win 7 ASCOM)

Camera: DSI IIc, no chiller CCD 19 °C

Acquisition: Nebulosity 4.0.2, no dither

Exposure: 32x600 s

Stacking: Neb 4, bad pixel map, bias included, 33 flats, OSC neb filter, match histograms, deBayer & square, trans+rot align, DSS 2x drizzle 1.75 κ-σ stack.

Processing: StarTools 1.4.305 Crop; Wipe 75%; Develop 74.20%; HDR optimize; Color: scientific, 250%; Deconvolute 5.0 pix; Track 6.0 pix, Smoothness 88%; Magic: shrink 2 pixels. CS6 Astronomy Tools levels and curves; layer masked deep space, space noise reduction; saturation boost slightly; Astroframe.

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