The Fly (NGC1931) (sydney)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: NGC 1931

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The Fly (NGC1931)

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The Fly (NGC1931)

The object commonly known as “The Fly” is the combination of a red emission nebula, blue reflection nebula, and an open star cluster. The star cluster is listed in the New General Catalog (NGC) as NGC 1931, while the nebulosity is included in the Sharpless catalog as Sh2-237. NGC 1931 is located in an extension of the Perseus Arm of the Milky Way about 7000 light-years away. The stars are relatively young at an age of about 10 million years. A study by A.K. Pandey and H.S. Mahra suggests the nebulosity may be a background object to the star cluster (http://articles.adsabs.harvard.edu//full/1986Ap%26SS.120..107P/0000113.000.html).

The Fly is often imaged in a wide field view with “The Spider” nebula (IC 417) which appears much larger and dominates the field. I have always admired the compact cocoon-like shape of The Fly and chose to highlight its unique features.

I hope you enjoy!

Please note: The following tables are updated every 24 hours.

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
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Astrometry.net job	3233170
PixInsight job	n/a
PixInsight queue size	n/a
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The Fly (NGC1931)

The Fly (NGC1931)

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The Fly (NGC1931)

The Fly (NGC1931)

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