The Swan Nebula (M17) imaged in Hydrogen-alpha (Andrew Klinger)

Celestial hemisphere: Southern · Constellation: Sagittarius (Sgr) · Contains: Checkmark Nebula · IC 4701 · IC 4706 · IC 4707 · Lobster Nebula · M 17 · M 18 · NGC 6596 · NGC 6613 · NGC 6618 · Swan Nebula · omega Nebula

The Swan Nebula (M17) imaged in Hydrogen-alpha, Andrew Klinger

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The Swan Nebula (M17) imaged in Hydrogen-alpha

Powered byPixInsight

The Swan Nebula (M17) imaged in Hydrogen-alpha

Equipment:
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

Accessories:
DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster

Software:
SGP
PHD2
PixInsight

Acquisition:
Location: Joshua, TX (Bortle 4)
Dates: 6/21/22, 6/22/22, 6/23/22, 6/24/22
Gain: 200 Offset: 50
Camera temp: -10C
Ha: 258x300" Astrodon 5nm 1.25"
Total integration time: 21hr 30min
64x darks per calibration (master from library)
32x flats per calibration
200x bias per calibration (master from library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment
ImageIntegration
DynamicCrop

Processing:
Deconvolution
TGVDenoise
ArcsinhStretch x2
HistogramTransformation
HDRMultiscaleTransform
Created a duplicate starless version using StarNet++
Combined the starless version with the image using PixelMath expression "F=0.5; (1-(1-$T)*(1-s)*F)+($T*~F)". (s=starless photo)
LocalHistogramEqualization
MultiscaleLinearTransform
CurvesTransformation
MorphologicalTransformation to reduce star size
UnsharpMask to slightly sharpen stars
Resampled to 60% for web posting

Narrowband imaging

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Basic success
Started	...
Astrometry.net job	5960152
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Contribution Index (beta):

The Swan Nebula (M17) imaged in Hydrogen-alpha

The Swan Nebula (M17) imaged in Hydrogen-alpha

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Image Index:

Contribution Index (beta):

The Swan Nebula (M17) imaged in Hydrogen-alpha

The Swan Nebula (M17) imaged in Hydrogen-alpha

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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