NGC 3521

Celestial hemisphere: Southern · Constellation: Leo (Leo) · Contains: NGC 3521

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NGC 3521

Link: http://www.meadowlarkridgeobservatory.com/ngc-3521/

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NGC 3521

Link: http://www.meadowlarkridgeobservatory.com/ngc-3521/

NGC 3521 resides in relative solitude, approximately 35 million light years from earth, between the constellations of Leo, Virgo and Hydra. The arms of this beautiful galaxy are somewhat irregular and discontinuous and as such is categorized as a flocculent spiral galaxy.

Perhaps the most intriguing aspect is the gas bubble evident around the galaxy. It is theorized that this gas shell is likely tidal debris – remnants of stars torn from satellite galaxies that merged with NGC 3521. Due to this gaseous shell it is sometimes referred to as the “Bubble Galaxy”.

The fact that Charles Messier did not discover this galaxy remains somewhat of a mystery as it is brighter than several he did discover in nearby Leo. William Herschel is credited with its discovery in 1784.

Exposure: L = 30 x 360s and 14 x 600s (total 5h 20m) RGB: 9 x 360s each bin 2x2.

Revision B: At the suggestion of others I have included more of the faint shell, or halo, around the galaxy. My apologies but in this case I believe the revisions really improved the image. Thanks to those that suggested it.

Original
Final
B

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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
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	761485
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC 3521

NGC 3521

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NGC 3521

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