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The Rosette Nebula narrow band, Aleix Roig
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The Rosette Nebula narrow band, Aleix Roig



Acquisition details



The Rosette Nebula, NGC 2237,  is a large and amazing HII region located in the Monoceros constellation. The nebula lays some 5.000 light years away from us and measures 130 light years in diameter spanning over 5 times the angular diameter of a full moon.In the core of the Rosette Nebula can we find the open cluster NGC 2244, composed by hot young O-type stars that sculpts, with its strong winds and radiation, the entire nebula creating this characteristic and aesthetic shape. This region evokes imagery of several African animals.

This image, with a total exposure of 13.5 hours, is the result of combining narrow band data, with the use of [SII], Hα and [OIII] filters, with broadband data, to give a natural color to the stars with the use of R, G, B filters (now removed for a starless image).

To better show the emission data that comes from this active star forming region, a variation of the HOO palette has been used to enhance the entire structure of this nebula. The percentages used to compose this image have been:

RED channel: 30% [SII] + 70 % Hα ; GREEN channel: 20% Hα + 80% [OIII] ; BLUE channel: 20% Hα + 80%

This new processing starless image (April 2022) gives to the nebula some better contrast enhancing some of the inner structures.

Image details:

Hα: 32x600"
[SII]: 9x600"
[OIII]: 18x600"

R: 18x300" - G: 12x300" - B: 18x300" 

Calibration: 50 darks, 50 bias 
All images taken at 0Gain Bin1 -25ºC 

Total exposure:  13,5h

Data processing April 2022 - Data acquisition 2018 


FSQ85ED telescope
Mesu200 mount
ASI 1600MM Pro camera with ZWO EFW 8 posGuiding with ASI174MC and ZWO OAG
Baader filters 

Software:  SGP, PHD2, APP, PIX, LR, PS, TPZ.  

Aleix Roig - Prades, Tarragona (Catalonia, Spain). April 2022.



The Rosette Nebula narrow band, Aleix Roig

In these public groups

Narrowband imaging
Cloudy Nights