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Thursday, December 20, 2012

Caldwell 49, the "Rosette Nebula", reprocessed




Images are reprocessed with my new method. This new technique will provide better color handling, softer look and high details at the same time. I collected here my Rosette Nebula images, they form a kind of zoom in series, since I have shot this target with various instruments and different focal lengths .

Be sure to click the images to see them at a full glory.


"Rosette Nebula"
Ra 06h 33m 45s Dec +04° 59′ 54″, shot with a 200mm camera lens

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum. 
Image is shot with a Canon EF 200mm f1.8 lens, Baader narrowband filters and the QHY9, a cooled astronomical camera. Lens full open, exposure time ~4h


Closer look
Shot with a 300mm camera lens

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum. 
Image is shot with a Tokina AT-X 300mm f2.8 lens, Baader narrowband filters and the QHY9, a cooled astronomical camera. Lens full open, exposure time ~6h



Even closer look
Shot with a Meade LX200 12" telescope

Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum. 
Image is shot with a Meade LX200 12" SC-telescope, Baader narrowband filters and the QHY9, a cooled astronomical camera, exposure time ~6h

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.


Images in mapped colors
Colors are mapped to a HST-palette, R=Sulfur, G=Hydrogen and B=Oxygen

Be sure to click the images to see them at a full glory.









A two panel mosaic
Rosette in wider context 

This image shows the Rosette nebula in wider field, the Cone Nebula and the Christmas Tree Cluster can be seen at left. Image is in mapped colors.


A study about the scale in the sky, compared to a full Moon




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