Celestial hemisphere:  Southern  ·  Constellation: Serpens (Ser)  ·  Contains:  Eagle nebula  ·  M 16  ·  NGC 6611
The Eagle Nebula (M16) imaged in Hydrogen-alpha, Andrew Klinger
The Eagle Nebula (M16) imaged in Hydrogen-alpha
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The Eagle Nebula (M16) imaged in Hydrogen-alpha

The Eagle Nebula (M16) imaged in Hydrogen-alpha, Andrew Klinger
The Eagle Nebula (M16) imaged in Hydrogen-alpha
Powered byPixInsight

The Eagle Nebula (M16) imaged in Hydrogen-alpha

Equipment

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Acquisition details

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Description

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: Flower Mound, TX (Bortle 7)

Dates: 5/11/18, 5/26/18, 5/27/18, 6/29/18, 6/30/18

Gain: 200 Offset: 50

Camera temp: -10C

Ha: 160x300" Astrodon 5nm

Total integration time: 13hr 20min

64x darks per calibration (master from library)

30x flats per calibration

200x bias per calibration (master from library)

Preprocessing:

Batch PreProcessing script to generate calibrated images

StarAlignment

LocalNormalization

ImageIntegration (Linear Fit rejection)

DrizzleIntegration

DynamicCrop

DBE

Processing:

Deconvolution

TGV & MMT 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 used that image as a mask to push faint nebulosity via ExponentialTransformation.

HDRMultiscaleTransform

LocalHistogramTransformation for large structures

HistogramTransformation

CurvesTransformation for slight contrast

LocalHistogramTransformation for small structures

MultiscaleLinearTransform for sharpening

DarkStructureEnhance Script

Resampled to 40% for web posting

Comments

Sky plot

Sky plot

Histogram

The Eagle Nebula (M16) imaged in Hydrogen-alpha, Andrew Klinger