NGC7635 Bubble Nebula (Peter Hannah)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble Nebula · NGC 7635

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NGC7635 Bubble Nebula

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NGC7635 Bubble Nebula

An H-II emission nebula in Cassiopeia, the bubble is formed by the powerful stellar winds from a massive hot central star. It is expanding into a surrounding hydrogen cloud which is glowing in the radiation from the star. The bubble is around 7 light years across and distance estimates range between 7,000 and 8,000 light years.

The central star (the brightest within the bubble, actually slightly off-centre) is SAO 20575 or BD +60º 2522. It is an O-type star estimated to be 45 times as massive as the Sun. Although only about 4 million years old it has already moved from hydrogen to helium fusion and is in the process of expelling its remaining outer layers of hydrogen. It is very likely to become a supernova within 10 to 20 million years.

The RGBH-α image is dominated by the H-α signal from the nebula, with the RGB mainly contributing to the star colours.Exposure times: Red 60min, Green 120min, Blue 140min, H-α 320min.

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
Started	...
Astrometry.net job	7918996
PixInsight job	n/a
PixInsight queue size	n/a
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NGC7635 Bubble Nebula

NGC7635 Bubble Nebula

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NGC7635 Bubble Nebula

NGC7635 Bubble Nebula

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