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Found 5 results

  1. From the album: Deep Sky Imaging

    Thor's Helmet Nebula, NGC 2359, located in the constellation Canis Major. This image total exposure time (of used subs) was 35 hours through HAlpha and OIII narrowband filters and was imaged through a 8" SCT at 2032mm focal length using a astro-modded and cooled DSLR. This image was a bit of a challenge with the Australian bushfires sending a lot of smoke into the atmosphere, causing me to throw out a lot of failed subs. 35 hours are the selected best subs I used on this image but have spent a lot more time in tracking this nebula from 30 November 2019 until 4 January 2020.

    © Mariusz Goralski

  2. On the 24th of January 2017, some user of the Liverpool Telescope decided to spend a few frames on Thor's Helmet. This is the only data on this object in the LT database and it consists of seven 120 s exposures, 3 with a Ha filter and two exposures of each of Bessell V (green) and Bessell B (blue). That is not much data but also not much work to stack, so I had a go at it. So this is a 14 min HaGB image. Thus, I put the Ha data in the red channel (since there were no red filter data), which probably explains the slightly unusual colours. All done in PS CS5. This is of course a rather noisy image (pixel peepers should stay away) compared to the Little Dumbbell that I recently posted with 3.6 h of LT data. Still, I am slightly amazed what a big scope can collect in 14 minutes. The scope is a 2 m RC f/10 (so 20 m focal length!) equipped with a 6 x 6 cm (15 µm pixels) 18 Mpix CCD camera (normally run at 2x2 bin) of the brand e2v, which I think is chilled to -100°C.
  3. Hi All Took this beautiful nebula also knows as Tor's Helmet during my visit to Namibia this year. Finally got a few nights to process the raw images to the photo you see here. Photo Details: Ha: 1.4 Hours OIII: 35 Min SII: 25 Min RGB: 15Min each. Telescope: ASA 12'' Astrograph F3.6 Mount: ASA DDM85 Camera: FLI8300 Mono Thanks for watching, Haim Huli
  4. Still entertaining myself with POSS2 data to keep learning processing while waiting for clear skies. This is an RGB image made from POSS2 red and blue filter data with a synthetic green channel (a 50:50 mix of red and blue). All processed in PS CS5. POSS2 is a 1990ies sky survey based on monochrome glass plate images (red or blue filtered) taken with a 1.2-m Schmidt camera at the Mt. Palomar Observatory. Data is available at: http://archive.stsci.edu/cgi-bin/dss_form Comments of course most welcome!
  5. Here's my latest, and my second experiment in bicolour narrowband: 31x 600s Ha, 29x 600s OIII, 10 each x 180s R, G and B. Flats, darks and bias, equipment as per sig, Pixinsight processed. Taken over three nights - I'd done a night each on Ha and OIII, but decided I needed a few more OIII (not least since I had a big guiding hiccup which meant that after I'd caught it and lazily not bothered to correct it, half the run were off-centre, though I still used them), so the third night I grabbed about 10 more OIII, but also thought I'd gather a little R,G & B. I've used that RGB just as chrominance only for the stars and a little bit from the blue channel for the 'cage' around the bubble. I've gone through various iterations of green-blue colour balance in processing it - I wanted to be true to the OIII wavelength and leave a decent amount of green in there, but it tends to be a bit overwhelming on some monitors, so I've leaned more towards the blue - hopefully I've found a pleasing balance. Thor's Helmet (NGC 2359) is an emission nebula in the constellation Canis Major. It is approximately 12 thousand light years away and the central bubble is 30 light-years across. The central star is the Wolf-Rayet star WR7, an extremely hot star thought to be in a brief pre-supernova stage of evolution. It is similar in nature to the Bubble Nebula, but interactions with a nearby large molecular cloud are thought to have contributed to the more complex shape and curved bow-shock structure of Thor's Helmet. Wolf-Rayet stars are characterised by a rapid loss of stellar mass, driven by chemically enriched high-speed stellar winds. The nebula has an overall bubble shape, but with complex filamentary structures. The nebula contains several hundred solar masses of ionised material, plus several thousand more of un-ionised gas. It is largely interstellar material swept up by winds from the central star, although some material does appear to be enriched with the products of fusion and is likely to come directly from the star. The expansion rate of different portions of the nebula varies from 10 km/s to at least 30 km/s, leading to age estimates of 78,500 - 236,000 years. Comments and cc welcome, hope you enjoy ! Stuart
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