Sh2-64 (W40 or LBN90) (Andrea Storani)

Celestial hemisphere: Southern · Constellation: Serpens (Ser) · Contains: The star 60Ser · The star 61Ser

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Sh2-64 (W40 or LBN90)

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Sh2-64 (W40 or LBN90)

Sh2-64 (W 40 or RCW 174 or LBN90) is a star-forming region in the Milky Way Galaxy in the constellation Serpens Cauda. At a distance of approximately 500 parsecs (1600 ly) this is one of the nearest sites forming O- and B-type stars. However, it is highly obscured by its molecular cloud, and cannot easily be observed in visible wavelengths of light. Ionizing radiation from the massive OB stars have created an H II region which has an hour-glass morphology.

The W40 star-forming region is projected on the sky in the direction of the Serpens-Aquila Rift, a mass of dark clouds above the Galactic plane in the constellations Aquila, Serpens, and eastern Ophiuchus. The high extinction from these foreground clouds means that this region looks unimpressive in the optical, despite being one of the nearest sites of massive star formation.

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QHY Users Group
Imagers of Italy
Sharpless2 Objects

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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	5233894
PixInsight job	n/a
PixInsight queue size	n/a
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Sh2-64 (W40 or LBN90)

Sh2-64 (W40 or LBN90)

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Image Index:

Contribution Index (beta):

Sh2-64 (W40 or LBN90)

Sh2-64 (W40 or LBN90)

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these public groups

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