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Hemisphere:  Northern
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Sh2-155 • The Cave Nebula in HOO, 



    
        

            Douglas J Struble
Sh2-155 • The Cave Nebula in HOO
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Sh2-155 • The Cave Nebula in HOO

Technical card

Imaging telescopes or lenses: Explore Scientific 152 mm Carbon Fiber

Imaging cameras: ZWO ASI1600MM-PRO

Mounts: Astro-Physics Mach 1 GTO

Guiding telescopes or lenses: Orion 80mm Short Tube

Guiding cameras: Starlight Xpress Lodestar x2

Software: PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  Photoshop CS5  ·  SkySafari Pro

Filters: Astrodon Ha 5nm  ·  Astrodon OIII 3nm

Accessory: QHYCCD PoleMaster  ·  Hotech 2" SCA Self-Centering Field Flattener  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite CFL 2.5" Large Format Focuser


Dates:July 13, 2017Aug. 16, 2017July 10, 2018July 12, 2018Aug. 11, 2019Aug. 23, 2019

Frames:
Astrodon Ha 5nm: 95x240" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 253x120" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm: 125x240" (gain: 139.00) -20C bin 1x1
Astrodon OIII 3nm: 243x120" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm: 208x240" (gain: 200.00) -20C bin 1x1

Integration: 45.1 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 21.82 days

Avg. Moon phase: 43.93%

Bortle Dark-Sky Scale: 8.00


Basic astrometry details

Astrometry.net job: 3251045

RA center: 22h 57' 49"

DEC center: +62° 36' 7"

Pixel scale: 0.648 arcsec/pixel

Orientation: 39.489 degrees

Field radius: 0.354 degrees


Resolution: 2540x3007

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard

Description

I played around with some data I captured this past summer originally processed in the SHO palette, but in a HOO palette this time. I combined data taken with my Explore Scientific 152 mm Carbon Fiber telescope in 2017, 2018 and in this past summer in 2019.

Sh2-155 (also designated Sharpless 155 or S155) is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity. It is widely known as the Cave Nebula, though that name was applied earlier to Ced 201, a different nebula in Cepheus. Sh2-155 is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

Sh2-155 was first noted as a galactic emission nebula in 1959 in the extended second edition of the Sharpless catalogue, being a part of the much larger Cep OB3 Association. Although Sh2-155 is relatively faint for amateur observation, some of its structure may be seen visually through a moderately sized telescope under dark skies.

Sh2-155 lies at the edge of the Cepheus B cloud (part of the Cepheus molecular cloud), and is ionized by young stars from the Cep OB3 association. It has been suggested that radiation from the hot O-type star HD 217086 is compressing the region, triggering the formation of a new generation of stars. A study of the region's young stellar objects by the Chandra X-ray Observatory and Spitzer Space Telescope shows a progression of stellar ages in front of the cloud, supporting the hypothesis of triggered star-formation.

Comments

Author

dugstruble
Douglas J Struble
License: None (All rights reserved)
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Sh2-155 • The Cave Nebula in HOO, 



    
        

            Douglas J Struble

In these public groups

Sharpless2 Objects