NGC7635 Bubble Nebula (Joe Niemeyer)

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

This is my image of the fascinating Bubble Nebula (NGC 7635), 7,100 light years from us in the constellation Cassiopeia. You can definitely see how this nebula got its name. The bubble is a shock front created by stellar wind travelling 4 million miles per hour from its massive young central star, SAO 20575, which is about 45 times the mass of our Sun. This star appears off-center toward the right side of the bubble since the right side of the shock wave is encountering a dense region of gases. This young star is a mere 4 million years old and is now fusing helium since it has blown off its hydrogen gas. It will explode in a spectacular supernova sometime in the next 10 to 20 million years. Like all bubbles, it will pop when the star explodes. I would love to see that!

The Bubble Nebula is 7 light years in diameter and embedded in a giant molecular cloud of hydrogen that is ionized by the same central star. You can see huge pillars of dust and gas to the right of the bubble where new stars are actively forming. NGC 7635 was discovered by the famed astronomer William Herschel in the late 18th century. It is a popular astrophotography subject since it is so unusual, yet challenging since it has such a broad dynamic range of light.

I made this image from thirty 300-second exposures through my Baader dual-bandpass filter (Hα and OIII) at 2312mm prime focal length, calibrated with 20 each dark, flat, and dark flat frames. I stacked the frames with Astro Pixel Processor and post-processed with Photoshop utilizing the StarXTerminator, Astronomy Tools, and Topaz DeNoise AI plugins.

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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	5271563
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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NGC7635 Bubble Nebula

NGC7635 Bubble Nebula

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NGC7635 Bubble Nebula

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