Elephant's Trunk Nebula, UHC-S, 6 Jun 2014 (David Dearden)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: VdB142

Elephant's Trunk Nebula, UHC-S, 6 Jun 2014

Found with the PicGoto starting from alpha Cephii. It took me a while to find the asterisms I wanted. Worse wind tonight than the prior two sessions; a dry cold front is apparently going through. I tried 600 s subframes and got round stars but they were overexposed, so I backed off. Guiding was terrible this session, but I made little effort to improve it because at this imaging scale it was good enough. There were lots of dark speckles in the nebulosity when I post-processed; I believe they are noise and processed them out.

The revision used a few more subframes and a bit more aggressive processing.

Date: 6 Jun 2014

Subject: IC 1396, Elephant’s Trunk Nebula

Scope: AT8IN + Antares 0.5x Telereducer

Filter: Baader Planetarium UHC-S

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

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.2.2 (Win 7 ASCOM)

Camera: DSI IIc chiller at 2.50 A, 6 to -2.0 °C

Acquisition: Nebulosity 3.2.0, no dither

Exposure: 52x300 s

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

Processing: StarTools 1.3.5.279 Crop; Wipe:Color & brightness 75%; Develop 87.49%; HDR Optimize soft; Color:Scientific, 200% sat.; Deconvolute auto mask 1.6 pix; Life:Moderate; Track RNC 3.43%; Magic:Shrink 1 pix. CS6 Astronomy Tools Increase star color; Deep space noise reduction; Less crunchy more fuzzy (twice); Levels; Astro Frame.

Original
Final
B

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Status	Advanced success
Started	...
Astrometry.net job	4475692
PixInsight job	F8WF6E0B7Z98RW47TQC69R9WPFB5S2J1
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	21h35m36s.93
RA (top/left)	21h38m24s.50
RA (top/right)	21h32m53s.98
RA (bottom/right)	21h32m49s.66
RA (bottom/left)	21h38m15s.69

Dec (center)	+57°28′05″.10
Dec (top/left)	+57°45′35″.3
Dec (top/right)	+57°46′10″.9
Dec (bottom/right)	+57°10′43″.2
Dec (bottom/left)	+57°09′54″.6

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Elephant's Trunk Nebula, UHC-S, 6 Jun 2014

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