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Showing content with the highest reputation since 04/05/20 in Images

  1. 4 points

    From the album: Deep Sky III

    NGC4725 is the brightest member of a galaxy group in the constellation Coma Berenices and is about 40million light years distant and 130,000 light years in diameter. The structure is somewhat unusual, consisting of just one spiral arm which is tightly wound around the core and can be followed for about 1.5 revolutions. The spiral arm consists of dust and gases including bright blue stars and pinkish Ha regions which indicate star forming regions. Towards the center, much older, yellow stars can be seen. The galaxy is classified as a Seyfert Galaxy, indicating that the center contains a supermassive black hole. The smaller galaxy on the right side is NGC4712 is within the galaxy group but is at the much greater distance of about 200million light years. The LRGB image below represents 12 hours integration time and was taken with my Esprit 150.
  2. 4 points
  3. 4 points

    From the album: NigeB's Images

    LRGB image with H-alpha 600 second subs LRGBHa 40:27:17:21:36 Celestron Edge 14 with 0.72 reducer Atik 460ex Baader filters Processed in PixInsight.
  4. 3 points

    From the album: Deep Sky Imaging

    This is a center crop of Sh2-308, AKA The Dolphin Head Nebula in the constellation "Canis Major". This was imaged through Baader 7.5nm HAlpha & OIII narrowband filters using my full spectrum modded and cooled Canon 40D DSLR and the Bosma 80mm refractor at 500mm focal length. This photo consists of 46x1200s of HII, 35x1200s and 2x600s of OIII and 36x60s, 32x150s and 21x210s of RGB subs @ ISO1600 for a total exposure time of 30.5 hours. This object is very weak in HAlpha signal but very strong in OIII. The benefit of a color camera is that I captured two spectra lines in one exposure, I had OIII signal in the green channel while simultaneously captured HBeta in the blue channel in the stack. I assembled this image as HAlpha as Red, OIII as green and HBeta as blue. The weak HAlpha signal outlined some parts of the bubble (the front of the dolphins head) so even if the HAlpha was weak, it was not a waste of time as it added detail to the image.

    © Mariusz Goralski

  5. 2 points
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  9. 1 point

    From the album: Deep Sky III

    NGC7008 is a planetary nebula located in Cygnus about 2800 light years distant and about 1 light year in size. The amateur astronomer Eric Honeycut named it the Fetus Nebula when he viewed it through his 22inch reflector. Planetary Nebula are one of the few astronomical objects that may appear green, so when processing this particular object you have to be careful when eliminating green from your image (eg SNCR green in PI) otherwise it will significantly change the colour balance of the object. Since it is so small and there's not much of interest in the background, I decided to crop it quite aggressively, so that a few details of the nebula can be seen more easily. So, here's an LRGB image consisting of 13 hours integration which was taken with my Esprit 150. Alan
  10. 1 point
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