NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici. (Phil Swift)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: NGC 4449

NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici., Phil Swift

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NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

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NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

NGC4449 is located about 12 million light-years away.

This galaxy is similar in nature to the Milky Way's satellite galaxy, the Large Magellanic Cloud (LMC), though is not as bright nor as large.

It has a general bar shape, also characteristic of the LMC, with scattered young blue star clusters.

Unlike the Large Magellanic Cloud, however, NGC4449 is considered a starburst galaxy due to its high rate of star formation.

Photos of the galaxy show the pinkish glow of atomic hydrogen gas, the telltale tracer of massive star forming regions.

NGC4449 is surrounded by a large envelope of neutral hydrogen that extends over an area of 75 arc minutes.

Interactions with nearby galaxies are thought to have influenced star formation in NGC4449, some of which are now being absorbed by it.

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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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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.

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NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

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Image Index:

Contribution Index (beta):

NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

NGC4449 (Caldwell 21) is an irregular Magellanic type galaxy in the constellation Canes Venatici.

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Acquisition details

Description

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