Crescent Nebula in Ha (NGC6888) (Andrew Klinger)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: Crescent nebula · NGC 6888 · The star 34Cyg

Crescent Nebula in Ha (NGC6888), Andrew Klinger

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Crescent Nebula in Ha (NGC6888)

Powered byPixInsight

Crescent Nebula in Ha (NGC6888)

This image shows the Crescent Nebula diving towards the larger structure that is part of the Gamma Cygni Nebula. This is my first time using a narrowband filter, specifically the Astrodon 5nm Hydrogen-alpha filter. Super pleased with the results given I was imaging from a red/white zone. RGB data will be coming later this month for a complete image!

Equipment:

OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)

Mount: Orion Sirius EQ-G (HEQ-5)

Guidescope: Orion 50mm guidescope

Guiding camera: Orion StarShoot Autoguider

Imaging camera: ZWO ASI1600MM-Cool

Software:

SGP

PHD2

CdC

PixInsight

Acquisition:

Location: Arlington, TX (Bortle 7)

Dates: 7/12/17, 7/18/17

Gain: 200 Offset: 50

Camera temp: -14C

Ha: 154x180" Astrodon 5nm

Total integration time: 3hr 12min

64x darks

30x flats

200x bias

Preprocessing:

Batch PreProcessing script to generate calibrated/registered images

ImageIntegration (Linear Fit rejection)

DynamicCrop

DBE

Processing:

Deconvolution

TGV noise reduction (via Jon Rista's method)

HistogramTransformation x2

Duplicated the image to create a starless version, using a starmask and several iterations of MMT and MT. Then pushed the faint nebulosity in the starless version using PixelMath expression: "1-(1-$T)*(1-$T)"

Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)" followed by the same function but with a value of F=0.2. (s=starless photo).

HistogramTransformation to move black point

LocalHistogramEqualization with inverted starmask

CurvesTransformation for contrast

DarkStructureEnhance Script

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The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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Status	Basic success
Started	...
Astrometry.net job	2052967
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Crescent Nebula in Ha (NGC6888)

Crescent Nebula in Ha (NGC6888)

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Image Index:

Contribution Index (beta):

Crescent Nebula in Ha (NGC6888)

Crescent Nebula in Ha (NGC6888)

Equipment

Acquisition details

Description

Comments

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