NGC 2403 Spiral Galaxy (Alastairmk)

Celestial hemisphere: Northern · Constellation: Camelopardalis (Cam) · Contains: NGC 2403

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NGC 2403 Spiral Galaxy

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NGC 2403 Spiral Galaxy

NGC2403 is a loose-structured spiral galaxy (about 18'x11') in the constellation Camelopardalis. This a LRGBHa image acquired under light polluted suburban skies using a ZWO ASI1600M camera at Gain 139dB (0.060 e-/DN) cooled to -15C:

L 131 x 180s

R 64 x 180s

G 75 x 180s

B 71 x 180s

Ha 47 x 480s for a total integration time of 23.3 hours.

Preprocessing in Pixinsight using WBPP and CosmeticCorrection. Preliminary noise reduction using MureDenoise, aggressive DynamicBackgroundExtraction to reduce light pollution gradients, followed by DeConvolution. RGBHa channels combined using Pixelmath and Photometric colour calibrated. Conventional stretching using HistogramTransformation after combining with Luminance channel. Using GAME mask aggressive removal of large scale background noise with MMT and small scale noise on galaxy with TGVDenoise. Star erosion following Adam Block's approach. Reduction of large scale halos using halo masks and Pixelmath, but unfortunately this can only work so far if the original subs are overexposed.

NOVAC

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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
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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	4174597
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 2403 Spiral Galaxy

NGC 2403 Spiral Galaxy

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NGC 2403 Spiral Galaxy

NGC 2403 Spiral Galaxy

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