Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  77 Dra  ·  LBN 550  ·  LBN 552  ·  LBN 555  ·  LDN 1228
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Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
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Molecular clouds in Cepheus (LRGB)

Revision title: Additional contrast and saturation adjustments

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Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
Powered byPixInsight

Molecular clouds in Cepheus (LRGB)

Revision title: Additional contrast and saturation adjustments

Acquisition details

Dates:
Sept. 24, 2022 ·  Sept. 29, 2022
Frames:
Baader Blue (B-CCD) 36 mm: 25×120(50′) (gain: 120.00) -10°C bin 2×2
Baader Green (G-CCD) 36 mm: 25×120(50′) (gain: 120.00) -10°C bin 2×2
Baader Red (R-CCD) 36 mm: 27×120(54′) (gain: 120.00) -10°C bin 2×2
Baader UV/IR Cut / Luminance 36 mm: 103×300(8h 35′) (gain: 120.00) -10°C bin 2×2
Integration:
11h 9′
Darks:
20
Flats:
25
Flat darks:
25
Avg. Moon age:
15.90 days
Avg. Moon phase:
8.27%
Bortle Dark-Sky Scale:
4.00

RA center: 20h54m46s.85

DEC center: +78°3142.5

Pixel scale: 2.917 arcsec/pixel

Orientation: 91.306 degrees

Field radius: 1.971 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 4003x2768

File size: 15.4 MB

Locations: Home (back garden), Dartmoor, Devon, United Kingdom

Data source: Backyard

Description

A collection of dark and bright(!?) molecular clouds in the area of Cepheus including (from left to right):
  1. LDN 1228 - a dark molecular cloud catalogued in the Lynd's Dark Nebula list. This also contains the brighter star forming region designated RNO 129
  2. LBN 550
  3. LBN 552 - considered the weakest in Lynd's Bright Nebula list measuring 6 on the scale of 1-6 which contains the bright, orange reflection nebula GN 21.00.4
  4. LBN 555

Also in the frame, near the centre, is the blue, main sequence star 77 Draconis (spectral type B8Vn) lying 403 light years away. This has a high surface temperature between 10,000K and 25,000K which is much hotter than our sun at 5,778K.

I was able to capture just over 11 hours of LRGB data over 2 nights in September 2022 with no Moon and good seeing. Although my skies are classified as Bortle 4 the northerly view is actually closer to Bortle 3. I'm hoping for more clear, moonless nights over the Autumn/Winter to concentrate on other dark stuff.

Comments

Revisions

  • Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
    Original
  • Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
    B
  • Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
    C
  • Final
    Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown
    D

B

Title: Increase saturation, brightness and contrast

Uploaded: ...

C

Title: Starless version

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D

Title: Additional contrast and saturation adjustments

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Sky plot

Sky plot

Histogram

Molecular clouds in Cepheus (LRGB), 



    
        

            Andy  Brown