Bubble Nebula NGC7635 (Dave Rust)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble Nebula · HD220057 · LBN 548 · LBN 549 · NGC 7635 · Sh2-162

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Bubble Nebula NGC7635

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Powered byPixInsight

Bubble Nebula NGC7635

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

The Big Eye in the Sky! It's the Bubble Nebula (NGC7635).

What the heck is going on here!

Astronomers say it looks like a star was so big and active that it prematurely blew up, ejecting most of its mass in all directions. A tremendous amount of hydrogen was first to go. Remaining in the center is a small, dense, white hot star (BD +60°2522) that is burning what is left...mostly helium. In doing so, it has begun to radiate a strong solar wind that is pushing gas remnants of its first explosion outward. That's the bright bubble in the middle of this image.

The center star's radiation is causing ejected hydrogen to be ionized and glow red and orange. But the star now has limited fuel and will likely collapse on itself in the next several million years, creating a supernova that may be even bigger.

We can see the star on the left side of the bubble as its solar wind pushes cooler clouds aside. The star is off-center! Scientists say this is because the expanding bubble is distorted when it encounters these denser, cooler gasses, particularly on the left side, slowing the expansion down. That also explains the slight vertical distortion of what would otherwise have been a perfect sphere.

Bubble is among several nebula-like features near the constellation Cassiopeia. It's 7000 light years away, in another spiral arm of our own Milky Way galaxy. The bubble itself is pretty bright, so astronomers have known about it since 1787...even if they weren't quite sure what they were observing at the time.

Tonight's tune motivating me to stay up is Riders On The Storm, covered by the Marcin Wasilewski Jazz Trio.

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
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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
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	Image of the day	Top pick	Top pick nominations	Total submitted
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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	Advanced success
Started	...
Astrometry.net job	6887198
PixInsight job	XVZ2F9B46SBMNKNU3M2VBKEYGQLAE9OQ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	23h20m50s.573
RA (top/left)	23h19m13s.402
RA (top/right)	23h19m10s.629
RA (bottom/right)	23h22m26s.105
RA (bottom/left)	23h22m32s.172

Dec (center)	+61°12′13″.100
Dec (top/left)	+61°30′02″.87
Dec (top/right)	+60°54′42″.72
Dec (bottom/right)	+60°54′20″.76
Dec (bottom/left)	+61°29′42″.56

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Bubble Nebula NGC7635

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