One-Armed Spiral Galaxy NGC 4725 (Prabhakaran)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: NGC 4712 · NGC 4725 · NGC 4747

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One-Armed Spiral Galaxy NGC 4725

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One-Armed Spiral Galaxy NGC 4725

NGC 4725 is an intermediate spiral (SABa) galaxy about 100,000 light-years across and lies about 40 million light-years away in the constellation of Coma Berenices. This peculiar galaxy is thought to have only one spiral arm while most spiral galaxies, including our own Milky Way, have two or more spiral arms. In this image, the solo spira mirabilis seems to wind from a prominent ring of bluish, newborn star clusters and red tinted star-forming regions. The odd galaxy also sports obscuring dust lanes a yellowish central bar structure composed of an older population of stars. Also visible in the image are NGC 4712 to the right and NGC 4747 in the upper left. NGC 4712 is a more distant background galaxy at about 207 million light-years away. The faint "tails" of NGC 4747 visible on the top left are caused by tidal interactions with NGC 4725.

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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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Northern lights
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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
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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	Advanced success
Started	...
Astrometry.net job	4548929
PixInsight job	RS02IE3YN18CFNW16SHKBJI9QL7DOS92
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h50m27s.712
RA (top/left)	12h51m57s.490
RA (top/right)	12h48m55s.774
RA (bottom/right)	12h48m58s.846
RA (bottom/left)	12h51m59s.175

Dec (center)	+25°31′15″.62
Dec (top/left)	+25°49′56″.91
Dec (top/right)	+25°49′17″.96
Dec (bottom/right)	+25°12′30″.79
Dec (bottom/left)	+25°13′09″.93

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One-Armed Spiral Galaxy NGC 4725

One-Armed Spiral Galaxy NGC 4725

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One-Armed Spiral Galaxy NGC 4725

One-Armed Spiral Galaxy NGC 4725

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