M100, 2 May 2013 (David Dearden)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: M 100 · NGC 4312 · NGC 4321 · NGC 4323 · NGC 4328

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M100, 2 May 2013

I found M100 easily by lining up the Telrad with Leo's hindquarters. The core of the galaxy is bright enough it is easy to see at 1-2 s in both the imager and the guider. To get the field of view I wanted, I decided to image without the focal reducer. I'm having some oscillation in RA tonight, so my stars are a bit football-shaped. Using the chiller, CCD beginning at 3.0 °C and falling to ~-2 °C. I tried processing without and with doing “auto color balance” in Nebulosity and found no significant difference.

Date: 2 May 2013

Subject: M100

Scope: AT8IN

Filter: None

Mount: CG-5 (Synta motors)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 1.14.2

Camera: DSI IIc (chiller at ~1.5 A, T = 0 °C)

Acquisition: Nebulosity 3.1.5, no dither

Exposure: 33x300 s

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

Processing: StarTools 1.3 Crop; Wipe:Color & Brightness; Develop 95%; Contrast; HDR:Reveal core; Sharpen; Deconvolute: 3.0 pix; Track; Color:Bottom 2.1, Top Full, Sat 561%; Magic:Shrink 2; Life:Moderate. CS6+Astronomy Tools healing brush; layer mask less crunchy more fuzzy; increase star color; layer mask unsharp mask on dust lanes; layer mask make stars smaller; AstroFrame.

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Status	Basic success
Started	...
Astrometry.net job	8629345
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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