The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha (Andrew Klinger)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: IC 1396 · The star Garnet Star (μCep)

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha, Andrew Klinger

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The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

Powered byPixInsight

The Elephant's Trunk Nebula (IC1369) 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

CdC

PixInsight

Acquisition:

Location: Flower Mound, TX (Bortle 7)

Dates: 7/17/19, 7/18/19, 7/19/19, 7/20/19

Gain: 200 Offset: 50

Camera temp: -10C

Ha: 396x180" Astrodon 5nm

Total integration time: 19hr 48min

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

DrizzleIntegration

DynamicCrop

DBE

Ha Processing:

Deconvolution

TGVDenoise (via Jon Rista's method)

ArcsinhStretch x2

HistogramTransformation

Duplicated image and created a starless image using Starnet++

Pushed nebulosity in starless image with PixelMath function "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)" where s=starless image.

MultiscaleLinearTransform for sharpening

MorphologicalTransformation for star size reduction

UnsharpMask on the stars to harden them up a tad

Resampled to 50% for web posting

Narrowband imaging

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	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	2822394
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

Image Index:

Contribution Index (beta):

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

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Image Index:

Contribution Index (beta):

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

The Elephant's Trunk Nebula (IC1369) imaged in Hydrogen-alpha

Equipment

Acquisition details

Description

Comments

Sky plot

Histogram

In these public groups

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