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  • Writer's pictureKevin Hearn

Rosette Nebula

The Rosette Nebula in all its Glory. The Rosette Nebula (Caldwell 49) is a large spherical H II region (circular in appearance) located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. 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 lie at a distance of some 5,000 light-years from Earth and measure roughly 130 light years in diameter.

This image is a total of 9 hours imaging using Narrowband Filters Ha, Si, Oiii. There are 36 separate 15 Minute exposures, (12 xHa, 11 xOiii, 13 xSi) taken with Atik460ex Mono Camera. This enables astrophotography to reveal details of objects in space that the human eye cannot easily see, if at all. The images are then Stacked in Deep Sky stacker, they are still black and white images at this stage. They are then processed in Photoshop and each filter image is mapped to what is none as the "Hubble Pallet" to create a colour image as if taken outside our atmosphere.

Below are the three separate filter images before each image is assinged to the respective Hubble Pallet colour.

Oii Mono Image

These are the first images I have taken using a fully automated Focusing procedure within SGPro capturing software.

The image below is the stacked Ha image before any of the captured light detail is pulled out using Photoshop Levels and Curves adjustments.

12 x Ha 900sec -10 stacked - unaltered.


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