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Friday, March 15, 2013

Rosette Nebula, a closeup, part II



I have combined the new Rosette data to an old one, from the year 2010.
New image has little different colors and much tighter stars. The natural color image, more or less red, is done by combining colors from wider field Rosette image to a closeup. Wide field image used is shot with Tokina 300mm f2.8 camera optics, UHC-s-filter and the QHY8 color camera. UHCs-filter from Baader delivers natural colors to the Nebula and stars. UHCs-data is shot simultaneously with new image of H-a emission.


Rosette Nebula & a star cluster NGC 2239
Ra 06h 33m 45s Dec +04° 59′ 54″


Image is in visual spectrum and dominated by the red light emitted by ionized Hydrogen, H-alpha. Blueish hues are from ionized Oxygen, O-III. Colors are shot simultaneously with H-a emission by using QHY8 color camera, Tokina AT-X 300mm f2.8 camera lens and Baader UHCs-filter.
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A new data alone

Image is in visual spectrum and dominated by the red light emitted by ionized Hydrogen, H-alpha. Blueish hues are from ionized Oxygen, O-III. Colors are shot simultaneously with H-a emission by using QHY8 color camera, Tokina AT-X 300mm f2.8 camera lens and Baader UHCs-filter.

A leaping Puma

A detail, from the image above, looks like a leaping puma!


INFO

The Rosette Nebula (also known as Caldwell 49) is a large, circular H II region located near one end of a giant molecular cloud in the Monoceros. The open cluster NGC 2244(Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula's matter. The cluster and nebula locates at a distance of about 5,200 light years from Earth. The diameter is about 130 light years. 
The radiation from the young stars ionized the atoms in the nebula, causing them to emit light, typical to each element, producing the visible nebula. Stellar winds, radiation pressure, from a group of stars cause compression to the interstellar clouds, followed by star formation in the nebula. This star formation is currently still ongoing.


Rosette closeup in mapped colors
from narrowband channels


Image is in mapped colors from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.


A new data alone

Image is in mapped colors from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.


A wide field image of the Rosette Nebula


Image is in mapped colors from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.



A study about an apparent scale

Click for a large image! 
Note. A moon size circle in the images as a scale. (Moon has an apparent size of 0.5 degrees, that's equal to 30 arc minutes)


Technical details

Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.

Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 11Hz
Image Scale, ~0,8 arc-seconds/pixel
13 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 4h 20min.
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Data from 2010
H-alpha 13x1200s, binned 1x1

Colors are taken from my older wide field image, for a mapped color composition, and new UHCs-filtered image, for a visual color composition.
 emission.

UHCs-filtered image
Shot for color information

This image is used just for the color information. Only 20min. of exposures.
Tokina 300mm f2.8 camera optics, UHC-s-filter and the QHY8 color camera. UHCs-filter from Baader delivers natural colors to the Nebula and stars. UHCs-data is shot simultaneously with new image of H-a emission.



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