Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble Nebula  ·  M 52  ·  NGC 7510  ·  NGC 7538  ·  NGC 7635  ·  NGC 7654
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NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field, 



    
        

            Timothy Martin & Nic Patridge
NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field
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NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field

Getting plate-solving status, please wait...
NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field, 



    
        

            Timothy Martin & Nic Patridge
NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field
Powered byPixInsight

NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field

Imaging telescopes or lenses: William Optics Z61II APO

Imaging cameras: ZWO ASI294MC Pro II

Mounts: iOptron CEM25EC

Guiding telescopes or lenses: William Optics 50/200 Guidescope

Guiding cameras: ZWO ASI290MM Mini

Focal reducers: William Optics Flat61a Flattener

Software: Topaz Labs DenoiseAI  ·  Nighttime Imaging 'N' Astronomy N.I.N.A. 1.10  ·  Aries Productions Astro Pixel Precessor v1.082  ·  Open PHD Guiding PHD2 2.6.9  ·  Pixinsight 1.8  ·  Topaz Labs Topaz Studio II  ·  Adobe Photoshop CC 2020

Filters: Triad Ultra Quad-Band Narrowband Filter Ultra Quad-Band Narrowband Filter

Accessory: Pegasus Astro Powerbox Advanced


Dates:Nov. 16, 2020Nov. 17, 2020Nov. 19, 2020

Frames:
Baader UV/IR Cut: 135x120" (4h 30') (gain: 120.00) -8C bin 1x1
Baader UV/IR Cut: 60x180" (3h) (gain: 120.00) -8C bin 1x1
Baader UV/IR Cut: 60x60" (1h) (gain: 120.00) -8C bin 1x1
Triad Ultra Quad-Band Narrowband Filter Ultra Quad-Band Narrowband Filter: 20x300" (1h 40') (gain: 200.00) -8C bin 1x1

Integration: 10h 10'

Darks: ~30

Flats: ~50

Flat darks: ~50

Avg. Moon age: 2.93 days

Avg. Moon phase: 11.05%

Bortle Dark-Sky Scale: 1.00


Astrometry.net job: 4158199

RA center: 23h 18' 29"

DEC center: +60° 34' 51"

Pixel scale: 2.155 arcsec/pixel

Orientation: 271.750 degrees

Field radius: 1.808 degrees


Resolution: 3401x4992

Locations: Marathon Motel, Marathon, Texas, United States; Big Bend Ranch State Park, Terlingua, Texas, United States

Data source: Traveller

Description

This is another wide-angle piece containing two emission nebulas (BTW, I refuse to use the Latinized versions of "nebulas" and "supernovas"--it sounds pretentious to my ear), among other things. This was shot on the Big Bend trip with the William Optics ZenithStar 61 small refractor.

Center right is the Bubble Nebula, NGC 7635. Discovered by William Herschel in 1787, it lies 11,000 light years away in the Cassiopeia constellation. The bubble was created, and is powered by what is thought to be a Wolf-Rayet star designated BD+60°2522 (but it may actually be a giant Type O star). That star has 44 times as much mass as the sun and will likely blow itself to smithereens in a Type 1 supernova explosion before too long. We photographed the Bubble back in August with the big scope and posted that picture here. But we barely knew what we were doing all those months ago, so the data we got was a mess. Still, we were very happy to get anything at all. I've attempted to reprocess that data and will post the results in the comments below.

Below and to the left of the Bubble Nebula is the Lobster Claw Nebula, Sharpless 157, which is about 8,100 light years away, also in Cassiopeia.

Just below and to the left of that (you'll have to zoom in close to see it) is the planetary nebula PLN 110.01. It's very hard to see in this picture. It looks like a small star with a tiny swath of bright red underneath it.

Above and to the right of the Bubble Nebula--much more visible than PLN 110.01--is a Messier object, an open star cluster called M52.

The bright spot to the right of the Lobster Claw is NGC 7538 in the constellation Cepheus 9,100 light years distant. It houses the largest known protostar, which is 300 times the size of our solar system.

The close smattering of stars just below the bottom claw is NGC 7510, which is an open star cluster on the border of Cassiopeia and Cepheus about 11,400 light years away.

So this target was a really rich one. I would like to have framed it in landscape rather than portrait, but this was one of several targets that night, and any rotation of the camera would require me to stop and take calibration images, which can take a while. I didn't want to waste any minutes under a dark sky.

Information credit: Annals of the Deep Sky, Volume 5, Kanipe & Webb (2017).

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NGC 7635 & Sh2-157 - The Bubble and Lobster Nebulas Wide Field, 



    
        

            Timothy Martin & Nic Patridge