IC342 Hidden Galaxy (Alastairmk)

Celestial hemisphere: Northern · Constellation: Camelopardalis (Cam) · Contains: IC 342

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IC342 Hidden Galaxy

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IC342 Hidden Galaxy

IC342 is large (21'x21') but doesn't appear very bright because its light has to travel through Milky Way dust. It has an IC catalogue listing apparently because it was too faint to be observed for older catalogues. The Milky Way star field in front of the galaxy also makes imaging such a faint object difficult -- too long subframe exposures bloats the foreground stars and captures light pollution, too short exposures clogs computer storage and adds to the processing burden. It's the kind of object where you center the scope on its coordinates and accumulate subframes on the first night which show only the faintest trace of the core of a galaxy. The intervening dust probably accounts for the yellow to red colour of the galaxy, which also sent a strong Ha component.

Processing in Pixinsight fairly conventional LRGB workflow. New NormalizeScaleGradient particularly useful in the process to remove light pollution gradients. Because of the Milky Way stars in the foreground, I used the new StarDemphasize Script that automates Adam Block's star erosion technique.

Subframes accumulated over 11 nights from mid December 2021 to end January 2022; L:139, R:62, G:66, B:63 all LRGB at 180s exposures, plus 28 Ha subframes at 480s.

NOVAC

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	Distinct awarded users	Total awarded images
Image of the day
Top picks
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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
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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
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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	5454872
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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IC342 Hidden Galaxy

IC342 Hidden Galaxy

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Image Index:

Contribution Index (beta):

IC342 Hidden Galaxy

IC342 Hidden Galaxy

Equipment

Acquisition details

Description

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