Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 7762  ·  NGC 7822  ·  NGC7762  ·  NGC7822  ·  PK118+02.1  ·  Sh2-170  ·  Sh2-171  ·  VdB2
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The Question Mark Nebula, 



    
        

            Gabe Shaughnessy
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The Question Mark Nebula

Imaging telescopes or lenses: Astro-Physics 92mm F6.65 Stowaway

Imaging cameras: ZWO ASI6200MM Pro

Mounts: Astro-Physics Mach1AP GTO CP4

Guiding telescopes or lenses: Astro-Physics 92mm F6.65 Stowaway

Guiding cameras: ZWO Optical ASI174MM

Focal reducers: Astro-Physics 0.8x CCD Telecompressor (92TCC)

Software: PixInsight  ·  Voyager  ·  Astro-Physics Command Center (APCC) Pro Software  ·  PHD2

Filters: Chroma OIII 3nm  ·  Chroma SII 3nm  ·  Chroma Ha 3nm

Accessory: Pegasus Astro Ultimate Powerbox v2  ·  Starlight Instruments Focuser Boss 2 HSM


Dates:Aug. 20, 2020Aug. 30, 2020Sept. 2, 2020

Frames:
Chroma Ha 3nm: 27x900" bin 1x1
Chroma OIII 3nm: 36x900" bin 1x1
Chroma SII 3nm: 29x900" bin 1x1

Integration: 23.0 hours

Avg. Moon age: 9.59 days

Avg. Moon phase: 65.11%


Astrometry.net job: 3832557

RA center: 0h 1' 55"

DEC center: +66° 37' 0"

Pixel scale: 1.563 arcsec/pixel

Orientation: -0.341 degrees

Field radius: 2.983 degrees


Resolution: 8102x11017

Data source: Backyard

Description

This region near the border of Cassiopeia and Cepheus begs a question. What it is, I'm not sure, but thought it was an interesting combination of nebulosity. At its core is NGC7822, a young star forming region that lies some 2900 light years away. This region has one of the hottest known close stars with a surface temperature of 45000K and luminosity at around 100000 times that of our Sun.

Near the bottom, punctuating this region, is Sh2-170, a small emission nebula often labeled as the Little Rosette Nebula. It lies some 7500 light years away, more distant than the foreground star forming region of NGC7822.

Check out the annotations for more details and the crops of each of the selected regions.

Comments

Revisions

  • Final
    The Question Mark Nebula, 



    
        

            Gabe Shaughnessy
    Original
    The Question Mark Nebula, 



    
        

            Gabe Shaughnessy
    B
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            Gabe Shaughnessy
    C
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            Gabe Shaughnessy
    D
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            Gabe Shaughnessy
    E

B

Description: Annotated version

Uploaded: ...

C

Description: LBN589 crop

Uploaded: ...

D

Description: NGC7822 crop

Uploaded: ...

E

Description: Sh2-170 crop

Uploaded: ...

Sky plot

Sky plot

Histogram

The Question Mark Nebula, 



    
        

            Gabe Shaughnessy