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Found 9 results

  1. Between the clouds, moon, neighbour's roof, nearby floodlights, and all the usual general life stuff, i've simply not been able to get any meaningful data on the HH (or Orion for that matter either) for the last 2 years! To say it's been my nemesis would be an understatement. At this rate i'll be glad to have that box ticked proper before i hit 50 ? So when we had a few hrs of clear sky (and no moon) a couple of weeks back i knew i had to give it a go. I luckily managed 9 x 7mins before it disappeared behind the neighbour's roof. I also have 5 subs of Ha (90 mins in total) from last March, although it wasn't of great quality (there was a nearly full moon right beside it, plus the neighbour's fire smoke was billowing up through the Fov ? ). I've been waiting patiently for more clear skies to add to this, but that 's not working out too well, lol. I really shouldn't be processing this, but all work and no imaging makes Ciaran a dull boy, so here goes nothin... 9 x 7mins with an IDAS-D1 4 x 1200s and 1 x 900s of Ha ~2.7 hrs in Total Stacked in APP and processed in PS. Lots of heavy lifting needed in PS, and i've reduced it to 50% in size as well. For now, at least, this will have to do. There's a lot of good HH's about so hopefully this one's not too hideous! ? I'll post what the 2 raw stacks looked like below as well, just for kicks. Here's the 9 x 7 mins raw stack (with DDP stretch): And here's the ~90min Ha raw stack:
  2. This weekend I dusted off some data for the Horsehead Nebula that I captured last year. This is quite a lot of Ha data (can't recall exactly how much), but much less G and B data (and I had the pick off prism of my OAG too close to the imaging sensor which caused quite bad vignetting...) Anyway, tried to clean up the G and B channels and combined using Ken Crawford's method (tutorial: http://www.rdelsol.n...ippingMask.html) I more or less stumbled on this colour balance. not the typical red but I quite like these - gives it a bit of a different take. Can't decide which I prefer: This method does seem to introduce noise from the colour channels... but obviously would be better with better quality data... Also was really practicing the RGB combine (or rather HaGB) so haven't done anything to address the noise...
  3. I've wanted to image the Horsehead Nebula from my obsey for quite a time but nearby trees have blocked my view. Determined that I would accomplish this in 2018, after a bit of tree pruning in late 2017, I managed to get a theoretical c1 hour per night visibility, albeit at quite a low elevation of c25 degrees. Not ideal, but better than nothing. Since I wasn't quite sure how much of an hour I'd get due to weather and moonlight conditions, I decided to reduce my Ha subs from my normal 1800s to 600s. Since some of the stars in my FoV are quite bright, I also cut my LRGB sub duration from 600s to 300s. The target has once again disappeared from my view for another year, however, I did manage to capture a usable c6 hours of subs and it only took me three months The image is an LRGB with a Ha blend into the Lum and Red channels. Alan LIGHTS: L:14, R:11, G:8, B:9 x 300s, Ha:14 x 600s, DARKS:30, BIAS:100, FLATS:40 all at -20C.
  4. alan4908

    Horsehead Nebula

    From the album: Deep Sky III

    An LRGB image with an Ha blend into the Lum and Red channels. Taking into account this was captured in non-ideal conditions (c25 degree elevation) due to tree obstructions and about 1hour visibility per night, I was quite impressed by the amount of detail which the narrowband subs generated.I normally take 30mins Ha subs but decided to reduce these to 10mins since I was uncertain how many usable subs I'd get due to the combination of the UK weather and the relatively short imaging window per night. In the end, it took 3 months to gather the data.....it is at times like this when I'm thankful for an automated imaging setup ! LIGHTS: L:14, R:11, G:8, B:9 x 300s, Ha:14 x 600s, DARKS:30, BIAS:100, FLATS:40 all at -20C.
  5. The Horsehead Nebula (B33) The Horsehead Nebula (Barnard 33) is one of the best known nebulae in the night sky but few astronomers have actually observed it through a telescope. The reason for this strange state of affairs is that the nebula is very dim as it is, in essence, just a pillar of dark dust and gas – in fact we can only see it because of the curtain of relatively bright Hydrogen Alpha (Ha) emissions (IC 434) behind it. This weekend several observers have seen it for the first time through a combination of excellent conditions - especially last night (25th/26th November) - and pure dogged determination to observe it. My hat is off to these intrepid observers who have persevered to achieve that goal. I on the other hand turned to the ‘Dark Side’ to achieve the same goal capturing my data over 2 nights, the first killed part way through by mist and cloud and the second (last night) working very well until a miscalculation in my image scheduling meant that the observatory closed down when it failed to maintain its guide star while imaging through a tree – Doh! Barnard 33 is a dark nebula situated in the Orion Molecular Cloud Complex in the constellation of Orion. Situated underneath the mag +1.74 ‘Belt Star’, Alnitak, this nebula is very well named as in images, its shape representing a horse’s head is clearly identifiable. For me it actually looks closer to a sea horse in appearance but the shape of a horse it most certainly is! Image Stats Mount: Mesu 200 Telescope: Sky-Watcher Esprit 150 Flattener: Sky-Watcher Esprit specific Camera: QSI 683 WSG-8 Filter: Astrodon 3nm Ha Subframes: 15 x 1800 sec Ha Integration: 7.5 hours Control: CCD Commander Capture: MaxIM DL Calibration and Stacking: PixInsight Post-Processing: PhotoShop PS3 I have deliberately taken a 'high key' approach to processing this data to release some of the additional detail often lost in the foreground region below the Horsehead Nebula itself. The Horsehead Nebula - B33
  6. Hi again! Last time I imaged IC5070 for approx 3 hours, then as Orion rose up I decide to use up the last of the clear skies imaging B33/NGC2024. 15 x 600s at ISO1600 with Canon 1000d, ED80 FFx0.85, darks and bias. Looking any advise on detail etc, how does guiding look, focus, etc. I'd like to try to progress so feedback welcome. It is still noisy, so definitely need more subs. I've also lost the plot somewhere with it somewhere during processing as there is artefacts all over the show! Thanks in advance Adam.
  7. Here's some shots from last night, none of which need much in the way of an introduction... First, NGC 253 in Sculptor, one of the brightest non-Messier galaxies at mag 7.2. This is 8 x 15s and the detail coming out suggests seeing was pretty good last night. Ignore the mislabelling as M33. Next, M42. This is in 1s subs. I tried to stop it stacking after just a few but it was belting away and by the time it stopped it had taken 22 seconds worth. The aim was to prevent overexposure of the Theta Orionis region using arcsinh compression of LodestarLive. Finally, the Horsehead. Although a reasonable image could be had in one minute (first shot), in this case I think the result of letting it stack through the entire observing session in the second shot (30x15) really paid off in terms of seeing the background nebulosity and the wisps of brighter material in the 'head' itself. That is the beauty for me of live stacking of shortish subs: less waiting, more observing, and the gradual emergence of fainter details. Cheers Martin
  8. Quite often I will start an image and not get time to finish it before the telescope being used has to move on. That is the case with this one, which is just 3 test exposures with a small refractor and Atik 11000. Usually the data just sits on my hard drive, going nowhere, but by chance I opened one of the exposures in Pixinsight and hit CTRL+A, and the auto-stretch feature revealed a bit more detail than I expected, so I just stacked the three images with no rejection to see what came out. Originally my intention was to frame a shot of the three main stars in Orion's belt, but the nebulosity and position of the horsehead nebula did not lend itself to a nicely composed picture. I definitely haven't gone for "pretty" here, but rather, with a drastic stretch of the outlying regions around the Horsehead, the image makes clear the density of the Hydrogen clouds in the area. We also get an idea of the amount of stars that get filtered out by comparing local areas within the image. Oddly enough, despite a personal propensity for pareidolia, and having imaged this area extensively for quite a while now, and even having a small contribution to this image https://apod.nasa.gov/apod/ap101005.html , I have never before noticed the looming Giraffe in the background. I shall look out for it in future though Tim
  9. I don't seem to get to do many imaging projects for myself these days. This year in particular seems to have been particularly lacking in clear dark nights, I don't know if you would agree? Complicating matters further in my locale has been a huge and long lasting A45 bypass, three years and still not quite finished. The site has been working 24/7, and they put perimeter lights all around the temporary site office complex. At the same time my kind neighbour (who knows what I do for a hobby and for pocket money) decided to install the brightest floodlight I have ever seen, and leave it on all night every night, shining at 90° over my garden.... At any rate, I found some subs that I captured in March of this year using a Skywatcher Esprit 150ED, and Atik 11000 camera. I don't actually remember capturing the data to be honest, so it was a nice surprise to find it on my HDD. Possibly the most photographed DSO in the sky, the iconic Horsehead nebula is instantly recognisable. For this picture I have combined a little bit of RGB colour data with the bulk of the data gathered with a Hydrogen alpha filter. Recently @ollypenrice posted a lovely picture of the same area, and somebody made a Facebook comment about letting the stars shine out. Which got me to thinking, rather than try an minimise the effects of Alnitak, the huge, hot, blue star on the mid left, I'd just let it do it's thing, dominating the picture, as it dominates in the eyepiece. Although the flame nebula and rear of the Horsehead are the brightest emission nebulae in the vicinity, the whole area is awash with thick clouds of gas and dust. This image represents the way I imagine the area would look if we could get in a bit closer. The image represents around 15 hours of Ha data, and 45 mins or so of Red, Green and Blue. Thirty minute Ha exposures. I've included the Ha image alone, and also a cropped approximation of the actual eyepiece views you may experience in dark skies, with a 16 inch telescope, using a Hydrogen beta filter. I saw this for the first time in the autumn and had of those astro moments that stays with you for a long time. A Hb filter is definitely on my shopping list once I get my dob mirror sorted. Thanks for looking. Tim
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