NGC2403 (Carl Tanner)

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

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NGC2403

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NGC2403

An outlier of the M81 Group of galaxies, ngc2403, is a galaxy very much like M33 in the Local Group. At 50963.5ly across and containing some 60 billion stars, ngc2403 is around the same size as M33, only a little more massive. Like M33, ngc2403 contains a great number of very prominent HII regions, the largest being ngc2404. ngc2404 is one of the largest HII known and spans 2000ly, a little larger than the Tarantula Nebula in the LMC (1840ly). However, unlike the Tarantula, the central cluster of the nebula is much smaller and looks more like a large OB association, whereas the central cluster of stars in the Tarantula weighs in at some 450K solar masses and resembles a nacent globular cluster. At 8 million ly (2.5Mpc) from Earth, in the constellation of Camelopardalis (the giraffe), the galaxy is closer than main body of the M81 Group, but its membership of the group is seen in their common motion through space Its apparent brightness of 8.9mag makes it the second brightest member of the group and it has a redshift velocity is 131km/s.

The Hubble Classification for the galaxy is SAB(s)cd, making it an intermediate barred spiral galaxy with no central ring and relatively loose arms around a smallish nucleus. The galaxy holds the distinction as being the first galaxy outside the Local Group where Cepheid variable stars were first discovered Two supernovae have been seen in this galaxy, SN1954j, which peaked at 16mag, and SN2004dj, which was the brightest supernova seen for the last 17 years and is still the brightest seen in the 21st Century.

Pic was taken with t68 (iTelescope, NMSO), 10x2min subs.

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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
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	3887908
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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