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Found 7 results

  1. Slowly working through my summer crop of data - here's my latest: Please click through on the image for a higher res version. 13x 300s (3 at ISO1600, 9 at ISO800), darks, flats and bias, kit as per sig, DSLR at prime focus, Pixinsight. Conditions weren't ideal hence I only got 13 subs - there were a few scattered fluffy clouds around, though it was clear in between so obvious which subs were affected, and due to time of year and position of an annoying hillside it was setting fairly early for me. Still, as a target it's so bright I don't think it suffered much from lack of data - actually I noticed that after the first 3 subs came in, at ISO1600, that the red channel looked like it was clipping, so dropped it to ISO800 for the rest of the run. The Lagoon Nebula (M8, NGC 6523) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as a H II region. In the foreground is the open cluster NGC 6530. The Lagoon Nebula is estimated to be between 4,000-6,000 light years from the Earth and measures 110 by 50 light years. The nebula contains a number of Bok globules (dark, collapsing clouds of protostellar material), the most prominent of which have been catalogued as B88, B89 and B296. It also includes a funnel-like or tornado-like structure caused by a hot O-type star that emanates ultraviolet light, heating and ionizing gases on the surface of the nebula. The Lagoon Nebula also contains at its centre a structure known as the Hourglass Nebula (the densest part). In 2006 the first four Herbig–Haro objects were detected within the Hourglass. Just for a laugh, here's the same target I took last year. I guess I'm improving !
  2. I'm back ! It seems AP is a real slow-burn hobby for me, I'm only really getting chances to take about 3-4 pics per year at the moment. Still, hopefully there'll be plenty of targets left for me when I eventually retire and can get that dream full frame set-point cooled CCD and all the filters. Anyway, here's the latest, taken in August: (click through for full version) About 30 or so lights, a mix of 5min and 7min exposures over 3 nights (well two nights, the middle one was abandoned to cloud), ISO1600, darks, flats and bias, equipment as per sig, modded DSLR, processed in Pixinsight. Hope you like it, I'm quite pleased with it. C & CC welcome. The Swan Nebula, also known as the Omega Nebula or the Horseshoe Nebula (M17) is an H II region in the constellation Sagittarius. It is located in the rich starfields of the Sagittarius area of the Milky Way. The Swan Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter and has a mass of 30,000 solar masses. The total mass of the Swan Nebula is an estimated 800 solar masses. It is considered one of the brightest and most massive star-forming regions of our galaxy. Its local geometry is similar to the Orion Nebula except that it is viewed edge-on rather than face-on. The open cluster NGC 6618 lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars. It is also one of the youngest clusters known, with an age of just 1 million years.
  3. Please can I have some expert advice on the following image: Canon 1100D (modded) , ED80 with 0.85 focal reducer, Astronomik CLS filter. 24 x 8 min lights, 20 darks and 20 flats. Processed in Deep Sky Stacker and Photoshop. Gradual application of levels and curves, attempts to increase hue, saturation and some use of "Actions" to bring out DSO itself. I really am struggling with colour balance since getting my camera modified. :-( Can't wait to go and stay with Olly and have some lessons in processing! 1. Why can I not bring out any colour in the nebulosity? 2. Why is there a red/brown hue across everything? 3. What should I do differently next time in either capturing or processing?
  4. Still working my way through my summer crop of data. Here's my take on that old favourite, Elephant's Trunk: Please click through for better resolution. 25x 300s lights at ISO1600, darks, flats and bias, equipment as per sig, DSLR at prime focus, processed in Pixinsight. I was experimenting with spacing of my coma corrector for this image, so it has some coma showing, this is a full frame image. I think I have better spacing now, but still not 100% happy with it, need to experiment more. I'm liking how the diffraction spikes on the newt can split multiple stars - if you zoom in on that bright central star, you can clearly see it's a triple. The Elephant's Trunk nebula (left of centre) is a concentration of interstellar gas and dust within the much larger ionized gas region IC 1396 (whole image) located in the constellation Cepheus about 2,400 light years away from Earth. It is commonly called the Elephant's Trunk nebula because of its appearance at visible light wavelengths, where there is a dark patch with a bright, sinuous rim. The bright rim is the surface of the dense cloud that is being illuminated and ionized by a very bright, massive star. The entire IC 1396 region is ionized by the massive star, except for dense globules that can protect themselves from the star's harsh ultraviolet rays. The Elephant's Trunk nebula is now thought to be a site of star formation, containing several very young (less than 100,000 year old) stars. Two slightly older stars are present in a small, circular cavity in the head of the globule. Winds from these young stars may have emptied the cavity. The combined action of the light from the massive star ionizing and compressing the rim of the cloud, and the wind from the young stars shifting gas from the center outward lead to very high compression in the Elephant's Trunk nebula. This pressure has triggered the current generation of protostars. Hope you enjoy !
  5. So here's the last of my summer's crop of data. I need to get out there again now and take some new stuff ! 28x 300s lights at ISO1600, darks flats and bias, equipment as per sig, modded DSLR at prime focus, Pixinsight. My wife surprised me by saying that it looks like a pacman, without her knowing the name of the nebula. Personally I think it looks more like an angler fish. The Pacman Nebula (NGC 281) is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590, the multiple star HD 5005, and several Bok globules. The multiple star consists of an 8th-magnitude primary with four companions at distances between 1.4 and 15.7 seconds of arc. Hope you enjoy, comments and cc welcome. Stuart
  6. Here's my latest, hope you like it ! 17x 300s lights at ISO1600, darks, flats and bias, equipment as per sig, modded DSLR at prime focus, Pixinsight processing. I actually took this back in July, but had a frustrating gap in processing when my laptop broke and had to be sent to Germany for repair - I had all the raw files backed up, but not the interim processed files nor the calibration files. There's a bit of coma still showing on this, but I think I've managed to get my spacings right now for some later runs still in my processing queue. The Eagle Nebula (M16, NGC 6611) is a young open cluster of stars in the constellation Serpens. Its name derives from its shape that is thought to resemble an eagle. It contains several active star-forming gas and dust regions, including the famous "Pillars of Creation", photographed by the Hubble Space Telescope (and by me). The Eagle Nebula is part of a diffuse emission nebula, or H II region, which is catalogued as IC 4703. This region of active current star formation is about 7000 light-years distant. A spire of gas that can be seen coming off the nebula in the northeastern part is approximately 9.5 light-years or about 90 trillion kilometers long. The cluster associated with the nebula has approximately 460 stars, the brightest of spectral class O, a mass of roughly 80 solar masses, and a luminosity up to 1 million times that of the Sun. Its age has been estimated to be 1–2 million years. C & CC welcome, hope you enjoy !
  7. Here's my latest, the Flying Horse Nebula (NGC7380) in Cepheus, aka the Wizard Nebula (though I don't think I can see a wizard, but I can definitely see a horse): 34x 300s at ISO1600, darks, flats and bias, equipment as per sig, DSLR at prime focus,Pixinsight. My wife and younger son say there are too many stars and I should photoshop a few out, and move the nebula to the right a bit... C & cc welcome, hope you like it ! Stuart
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