Leo Triplet (Johannes Bock)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: IC 2763 · M 65 · M 66 · NGC 3623 · NGC 3627 · NGC 3628

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Leo Triplet

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Leo Triplet

At a distance of 35 million light-years, the apparent separation between M 65 and M 66 corresponds to a distance of 190,000 light years. Their true separation is no doubt considerably greater, because it is unlikely that both galaxies lie at the same distance from us. M66 has an absolute magnitude of -21, a luminosity of 21 billion suns, and a true diameter of at least 75,000 light years.

Messier 66 has a well-developed central bulge, and is classified as type Sb. Its spiral arms are obviously deformed, probably due to encounters with its neighbors. They seem to be distorted, and displaced above the plane of the galaxy. Much dust is visible, as well as a few pink nebulae - signs of star formation - near the end of one of the arms. Gravitational interaction from its past encounter with neighboring NGC 3628 has resulted in an extremely high central mass concentration, and a clump of atomic hydrogen gas that has apparently been removed from one of the spiral arms.

Original
Final
B

Cloudy Nights

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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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Noctilucent clouds
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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	Basic success
Started	...
Astrometry.net job	4484425
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Leo Triplet

Leo Triplet

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