M51 Galaxy (Luca Dinoi)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: IC 4277 · IC 4278 · M 51 · NGC 5194 · NGC 5195 · Whirlpool Galaxy

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M51 Galaxy

Link: https://flic.kr/p/2ne8nPe

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M51 Galaxy

Link: https://flic.kr/p/2ne8nPe

M 51 is an astronomical object from Messier's catalog which includes two distinct galaxies, in the boreal constellation of Cani Hunting:

The larger and more famous Whirlpool Galaxy (also known as NGC 5194 and sometimes M51A) is a classic spiral galaxy. It was discovered by Charles Messier on October 13, 1773.
The smaller companion galaxy known as NGC 5195 (or also M51B), is partially covered by a dust arm of the Vortex spiral (with which it interacts) and was discovered by Pierre Méchain in 1781.

The Whirlpool Galaxy is one of the brightest and most interesting galaxies in the sky: it is 15 to 37 million light-years from Earth and 50,000 to 100,000 light-years wide. It is also the dominant member of a small group of galaxies called the M51 group. Much of its intense brightness is due to the presence, in the arms, of young star clusters. This galaxy was the first whose spiral structure was observed, by William Parsons in 1845; astronomers speculate that the spiral shape is mainly due to gravitational interactions with the smaller galaxy. The spiral drawn by the arms of the galaxy is a logarithmic spiral.

The Whirlpool Galaxy is joined to NGC 5195 through a common envelope of gas. The interaction between the two galaxies has led to increased star creation in NGC 5195. The core of the Whirlpool Galaxy is also brighter than one might expect, leading some scholars to classify it as an active Seyfert galaxy.

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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	6914886
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M51 Galaxy

M51 Galaxy

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Image Index:

Contribution Index (beta):

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M51 Galaxy

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