IC 443
The Cresent Nebula



Combination of 5, 3 minute images using using clear, red and green filters.
SBIG ST-9XE CCD. 5" f/5 refractor at prime focus.

IC 443, also known as the "Cresent Nebula" is an ancient supernova remnent in Gemini, between the stars mu geminorum (Tejat Posterior) and eta geminorun (Propus).

While taking the above images, clouds prevented me from obtaining any blue filtered images. To produce the final colour image, I manufactured a blue image by subtracting the red and green images from the clear image. Not ideal, however it resulted in a reasonable image.



Combination of 10, 3 minute images using a clear filter,
5, 3 minute images using red and green filters, and 6, 3 minute images using a blue filter.
SBIG ST-9XE CCD. 10" f/6.3 schmidt-cassegrain at prime focus.



Combination of 40, 3 minute images using an H-alpha filter.
SBIG ST-8E CCD. 5" f/5 refractor at prime focus.



Combination of 20, 3 minute images using an H-alpha filter.
SBIG STL-1001E CCD. 5" f/5 refractor at prime focus.



Combination of 15, 3 minute images each with red and green and blue filters.
SBIG STL-1001E CCD. 5" f/5 refractor at prime focus.



Combination of 12 5-minute images using H-alpha, SII and OIII filters. Processed using the European Southern Observatory palette.
SBIG STL-1001E CCD. 5" f/5 refractor at prime focus.

The above image was processed using the H-alpha images as the red channel. This is the preferred palette of the European Southern Observatory. The HST observers prefer to use the SII images as the red channel since the SII line is at a slightly longer wavelength than the H-alpha line. This results in a more green-dominated image as shown below.


The same image as above, but processed using the HST palette.



Combination of 10, 3 minute imagesusing an H-alpha filter.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.