NGC 4945 The Perfect Shot

The image is the composition of 4 x 120 seconds exposure in Clear filter from the T17 at Siding Spring Observatory in Australia, 432mm f/6.7 reflector and CCD FLI ProLine PL4710. I used also two images from ESO website in order to add colors to the image.

NGC 4945 is a barred spiral galaxy in the constellation Centaurus, visible near the star Xi Centauri. The galaxy was discovered by James Dunlop in 1826 and is thought to be similar to the Milky Way Galaxy, although X-ray observations show that NGC 4945 has an unusual energetic Seyfert 2 nucleus that might house a supermassive black hole.


I made two versions, one using the colors from Red, Blue and Ultraviolet filters, and for the second I used a combination of five filters B, V, R, H-alpha and SII both of them took from the ESO website. I want to point that the details from the photo are the result of only the processed raw frames from the T17 telescope, and only the colors are from the ESO images.

Credits to ESO for the photos I used for the colors. The original photos have been shot using the Wide-Field-Imager (WFI) at the MPG/ESO 2.2-m telescope at La Silla. You can check the original photos here and here.

I processed the images with IRIS, where I did the registration, stacking and combined the luminance frame with the ESO images, then with Lightroom CC I cleaned a little to make it more pleasant. I applied the asinh filter (logarithmic scale ) to show more details from the final photos you see on the post. If you are looking for linear scale images I leave the link to Google Drive where I leave all the raw and processed images for later analysis.

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