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Found 13 results

  1. Toxophilus

    M1 - Crab Nebula

    From the album: Deep Sky Objects

    Messier 1 - Considerably better than my previous attempts at this object. Taken with reasonable guiding, with reasonable seeing conditions (allowing for the light pollution). I had a restricted time window for this image caused by a combination of cloud and the target getting close to roofs of houses. I tried a different technique to deal with the light pollution, by putting a light pollution filter on the front on the filter wheel nose and then imaging as normal. The addition of the extra filter did not affect the parfocal nature of the Xagyl LRGB filters used. For more information the AstroBin Link is: http://www.astrobin.com/243527/
  2. Toxophilus

    M1 - Crab Nebula

    From the album: Deep Sky Objects

    A supernova remnant in the constellation of Taurus. It is believed that this was first observed by Chinese astronomers in 1054. I was hoping to image this via my LX90 8" SCT and get a much more detailed and larger image of M1 but tracking issues forced me to drop back to using my ST80. For more information the astrobin link is: http://www.astrobin.com/239987
  3. The fine, dry conditions that we had for a few nights in the last couple of weeks enabled me to capture about 9 hours of narrowband data of M1. I need to capture some new flats following a slight change to the imaging train so the image below is not as good as it might be but it still is worth showing, I hope. I'll reprocess when I have the new flats and post an update. Equipment: TS (GSO) 12" truss RC (Operating at 1700 mm Focal Length with AP focal reducer) with modified back plate, Mesu200, Atik383L+, Atik EFW2, Lodestar X2 on Atik OAG Captured with MaxImDl and processed in Pixinsight. Exposure: S-II=H-A=O-III = 12 x 900s each filter. Combined using SHO script in Pixinsight and composited with a synthetic luminance made from all the subs. The colormask (sic) script in PI was helpful in modifying the image to a more pleasing (to my eye) colour palette. Derrick
  4. Still dipping my toes into narrowband imaging I decided to have a go a the crab nebula. Processing is done in a sort of Hubble palette with 15x10 min Ha as green, 16x10 min SII as red and 17x10 min OIII as blue. All binned 2x2 and imaged with an Atik 460 in an Orion AG12. Curves, levels, a little sharpening of the nebula and some colour adjustment. /Lars
  5. Vixen 114ED refractor, NEQ6, SXV-H9, 30 x 300s Ha and O3 subs, from December...
  6. The Crab Nebula (also known as M1, NGC 1952 or Taurus A). This is quite an improvement on the last attempt at imaging M1 about two years ago. This time it was possible to bring out some of the filaments that make this object so interesting - this despite using a much shorter focal length making the object appear significantly smaller. The image is cropped rather radically to show more details in the nebula so the stars appear bigger than I would prefer, but on the original they look fine. 040 x 300 second exposures at Unity Gain (139) cooled to -20°C 050 x dark frames 040 x flat frames 100 x bias frames Binning 1x1 Total integration time = 3 hours and 20 minutes Captured with APT Guided with PHD2 Processed in Nebulosity, Fitsworks, and Photoshop Equipment Telescope: Sky-Watcher Explorer-150PDS Mount: Skywatcher EQ5 Guide Scope: Orion 50mm Mini Guiding Camera: ZWO ASI120MC Imaging Camera: ZWO ASI1600MC Pro Baader Mark-III MPCC Coma Corrector Light pollution filter
  7. Crab Nebula, imaged on January 2nd 2017 13 x 8 minute exposures at 400 ISO (2 hours and 24 minutes) 10 x dark frames 10 x flat frames 21 x bias/offset frames (subtracted from flat frames only) Captured with APT Guided with PHD2 Processed in Nebulosity and Photoshop Equipment: Celestron NexStar 127 SLT Skywatcher EQ5 Mount Orion 50mm Mini Guide Scope ZWO ASI120 MC imaging and guiding camera Canon 700D DSLR
  8. Hi all Images from last week, M1, the Crab Nebula Ha - 1x20m Ha - 4x15m RGB each - abt. 5x5m bin2 Unfortunately, although my first L sub came out pretty as you please, mist came up, so no L. Again, no calibration frames..never seem to get around to it. On the first one, I favored Ha (HaRGB, Ha mapped to red, Ha as pure lum., thus less stars), the second one is a combo of HaR mapped to red, and HaR as lum., to keep the regular spectrum stars. Andy
  9. http://www.independent.co.uk/news/science/prince-dead-purple-nasa-picture-nebula-photo-crab-tributes-a6996396.html
  10. We're gradually learning our way into some basic deep sky imaging with our relatively straightforward set up. Imaging M1, the Crab nebula, is probably our most challenging object so far. We're using a Nikon D50 mounted at prime focus of a SW 200p and tracking is achieved with the SW dual axis motors on a polar aligned EQ5. In our previous attempts we stored the images as jpeg files from the start. This time we used the Nikon raw file format and read the images directly into Deep Sky Stacker. This all worked fine and DSS was happy with the format. The first issue we had came with a warning during the processing that we were running low on disc space and I managed to shovel some large directories onto another disc (actually a different partition) while the processing continued. However, the real blocker was an "out of memory" message that popped up. Not surprising we thought as the laptop only has 1 Gb of RAM. This morning we put all the files onto our main PC, which has significantly more memory and disc space. We still had issues with memory but we got around this by not using 2x drizzle and including only the highest scoring sub images in the set. The final image, shown here, had the levels tweaked in photoshop. We used the small set of darks but we haven't yet got as far as worrying about flats. Compared to previous attempts it's clear that the focusing isn't quite right and maybe it's time to think of a Bahtinov mask to make absolutely sure. The tracking wasn't as good this time either and I now realise that the telescope may have not been ideally balanced on the mount. In retrospect I should have balanced the scope (positioned the tube in the rings) with the SLR in place before lining up on M1 using my 20 mm EP (being a bit out of balance with the EP wouldn't have been as important). I haven't found it possible to move the scope down an inch or so through the rings to rebalance without altering the alignment. The image is composed of 18 x 30 s subs with only 3 darks at an ISO of 800. Having done a little bit of reading about what is ideally required for dark images, and from advice in previous posts, I realise that a greater number of darks are required to reduce noise rather than contribute to it. Ideally the darks should be taken with the camera in as close a condition as it was when the lights were taken in terms of temperature and just before and after the series of lights were taken. I also realise that longer exposures are needed to minimise noise - but that then opens up issues with tracking accuracy and, at least for the foreseeable future, we're quite happy to stick to this rather than have the complications of guiding as we like the simplicity of our current set up. If the tracking etc looks good then we'll certainly experiment with exposure time next. The main purpose of this image, apart from attempting to capture M1, was to see if we could process the lights with accompanying darks through DSS via the Nikon raw format. That all worked but it is a little concerning that we had issues with computer resources on a fairly small data set. I assume that it's possible to break things down in to smaller sets and stack the resulting tiff files in DSS without corrections applied but this seems a bit clunky. Any tips or thoughts would be greatly appreciated.
  11. Like many people, I was out with the scope for the first time in ages last night taking advantage of the one clear night . As the forecast for the rest of the month was looking dreadful, I decided to give the Crab Nebula the One night treatment with my Esprit 120ED. It was a bit blustery, so the tracking was not the best, hence the shape of most of the stars , but you can't have everything going your way . All details of how I captured the image are on Astrobin, but any questions / comment, please ask / give . http://www.astrobin.com/231113/
  12. First attempt at the Crab nebula (clear sky at the end of November, Gift one) and using my new coma corrector for the first time (gift two) 135 X 60 sec lights at 1600 ISO and 30 darks & flats. stacked in DSS and processed in PS cs2 Equipment as per signature. probably over processed it but 'every days a school day' that's why I've put up here. all comments and advice is welcomed. 50% crop. thanks for looking Tim
  13. From the album: DSO, Nebula, Galaxies, Comets etc

    M1 The Crab Nebula 08.12.2017 William Optics FLT-110 and Atik 314L Monochrome CCD 10 x 300 seconds H-Alpha, 10 x 300 seconds OIII, 10 x 300 seconds SII Stacked in Deep Sky Stacker and processed in Photoshop CS2 False colour image by assigning SII to red channel, H-alpha to green channel and OIII to blue channel

    © vicky050373

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