NGC3718 & NGC3729 (Peter Hannah)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 3718 · NGC 3729

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NGC3718 & NGC3729

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NGC3718 & NGC3729

NGC3718 (centre) is a spiral galaxy with a distinctive twist, found in Ursa Major just south of the Plough. Also designated Arp 214, the mag 10.7 galaxy is 9.2 x 4.4 arcminutes in size. The Arp Atlas of Peculiar Galaxies notes it to be a Seyfert galaxy, meaning it has a very bright active core.

The second-largest galaxy in the image is NGC3729, also a spiral. Both are classed as barred spirals, though the Arp atlas notes that the bar in 3718 is a dust lane rather than being stellar in nature. The two galaxies lie at a similar distance - about 40 million light years - and are probably interacting, which may have caused the distortion in NGC 3718.

To the south (lower left) of NGC3718 is Hickson 56 (Arp 322), a group of 5 galaxies of 15th and 16th magnitude, considerably further away at around 400 million light years.North is to the upper right in this image.

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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.

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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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Astrometry.net job	9918307
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NGC3718 & NGC3729

NGC3718 & NGC3729

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Image Index:

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NGC3718 & NGC3729

NGC3718 & NGC3729

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