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Contains:  M 1, Crab nebula, NGC 1952
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Narrowband Crab, 





    
        

            Edoardo Luca Radi...
Narrowband Crab

Narrowband Crab

Technical card

Imaging telescope or lens:C9.25

Imaging camera:SBIG ST-2000XM

Filters:Baader Planetarium Ha 7nmBaader Planetarium OIII 8.5nm

Resolution: 1410x981

Dates:Dec. 30, 2014

Frames:
Baader Planetarium Ha 7nm: 10x600" -30C bin 1x1
Baader Planetarium OIII 8.5nm: 22x600" bin 1x1

Integration: 5.3 hours

Darks: ~50

Flats: ~20

Bias: ~100

Avg. Moon age: 9.18 days

Avg. Moon phase: 68.61%

Bortle Dark-Sky Scale: 5.00

Temperature: -4.00

Astrometry.net job: 2284145

RA center: 83.635 degrees

DEC center: 22.008 degrees

Pixel scale: 0.678 arcsec/pixel

Orientation: 97.096 degrees

Field radius: 0.162 degrees

Locations: Castenedolo, Castenedolo, Italy

Description

Bicolor composition of the Crab Nebula trying to simulate "real" colors.
The technique is similar to those explained here.

The Crab nebula seems to be very greenish: this is due to the strong OIII emission whose wavelength falls between blue and green.

Image A is the colorized version of the H alpha emission with the right wavelength
Image B is the colorized version of the OIII emission with the right wavelength
Image C is the colorized version of the H beta emission, obtainsed from the H alpha image, with the right wavelength

Revision E: Some Curves trimming and green reduction to get more pleasant color balance

Composizione Bicolor della Nebulosa del Granchio cercando di simulare i colori "reali".
la tecnica è simile a quella spiegata qui.

La nebulosa granchio sembra essere decisamente verdastra: ciò è dovuto alla forte emissione OIII la cui lunghezza d'onda cade tra blu e verde.

versione A è L'immagine H alpha colorata secondo la propria lunghezza d'onda
versione B è L'immagine OIII colorata secondo la propria lunghezza d'onda
versione C è L'immagine H beta, ottenuta artificialmente dall'emissione H alfa, colorata secondo la propria lunghezza d'onda

Revisione E: Aggiustamento delle curve e riduzione del verde per ottenere un bilanciamento cromatico più piacevole

Comments

Author

astroedo
Edoardo Luca Radi...
License: Attribution-NonCommercial-NoDerivs Creative Commons
6234
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Revisions

  • Narrowband Crab, 





    
        

            Edoardo Luca Radi...
    Original
  • Narrowband Crab, 





    
        

            Edoardo Luca Radi...
    B
  • Narrowband Crab, 





    
        

            Edoardo Luca Radi...
    C
  • Narrowband Crab, 





    
        

            Edoardo Luca Radi...
    D
  • Final
    Narrowband Crab, 





    
        

            Edoardo Luca Radi...
    E

Sky plot

Sky plot

Histogram

Narrowband Crab, 





    
        

            Edoardo Luca Radi...

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Imagers of Italy
Narrowband imaging