Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  Sh2-105
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NGC 6888, Crescent Nebula, Hα, 27 Jul 2015, David Dearden
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NGC 6888, Crescent Nebula, Hα, 27 Jul 2015

Equipment

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Description

Very nice conditions save for slight wind. Better guiding performance for once (unidirectional south again for DEC). Synched on Sadr and had a trivially easy goto. Imaged up to the meridian, performed a flip, and continued.

Date: 27 Jul 2015

Subject: NGC 6888, Crescent Nebula

Scope: Astrotech AT8IN

Filter: Baader 7 nm Hα

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 cooling (about 21 °C)

Acquisition: Nebulosity 4.0.2, no dither

Exposure: 41x600 s

Stacking: Neb 4.0.2, bad pixel map, bias included, 33 flats, OSC extract R, normalize intensities, square, align. DSS 2x drizzle, 1.5σ median κ-σ stack.

Processing: StarTools 1.3.5.289 Crop; Wipe 75%; Develop: 82.26%; HDRptimize; Deconvolute 4.3 pix; Track 6.3 pix, smoothness 88%; Magic, shrink 1 pix. Photoshop CC 2014 + Carboni Astronomy Tools curves; liquify-pucker on large stars; Astroframe.

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NGC 6888, Crescent Nebula, Hα, 27 Jul 2015, David Dearden