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Found 7 results

  1. Before I get told that I post too much, I thought I could cut down on the number of posts by this time posting two galaxies, both in RGB. They are processed (in PS) from subs downloaded from the Liverpool Telescope site (LT is a 2 m RC scope on La Palma). NGC 2403: 9 x 190 s of data from each of the following filters sdss-r (red), Bessell-V (mainly green) and Bessell-B (blue). No Ha filter was available but there is of course Ha in the sdss-r filter. So totally 27 x 190 s = 1.4 hours NGC7479: (here the subs were 60 - 120 s, average ca 90 s) 44 x 90 s of sdss-r (red channel); 10 x 90 s of Bessell-V; 23 x 90 s of Bessell-B; 9 x 90 s of sdss-g (mixed with Bessell B for the blue channel). There were 3 Ha subs on the site but I skipped them as they did not contain much data and mainly created noise. So totally 86 x 90 s = 2.15 hours. About the galaxies (I looked them up in Wikipedia for you): NGC 2403 (also Caldwell 7) is an intermediate spiral galaxy in the constellation Camelopardalis. NGC 2403 is an outlying member of the M81 Group, and is approximately 8 million light-years distant. It bears a striking similarity to M33, being about 50,000 light years in diameter and containing numerous star-forming H II regions. NGC 7479 (also known as Caldwell 44) is a barred spiral galaxy about 105 million light-years away in the constellation Pegasus. It was discovered by William Herschel in 1784. Supernovae SN 1990U and SN2009jf occurred in NGC 7479. NGC 7479 is also recognized as a Seyfert galaxy and a Liner undergoing starburst activity not only on the nucleus and the outer arms, but also across the bar of the galaxy, where most of the stars were formed in the last 100 million years. Polarization studies of this galaxy indicate that it recently underwent a minor merger and that it is unique in the radio continuum, with arms opening in a direction opposite to the optical arms.[3] This feature, along with the asymmetrical arms of the galaxy and the intense star formation activity are attributed to a merger with a smaller galaxy.
  2. Back in March 2017, Barry Wilson and I collaborated on an LRGB image of NGC 2403 using Barry's WO FLT 132/QSI 683 and my Esprit 120/QSI 690. Overall we gathered 90 mins each of RGB and 260 minutes of Lum - NGC 2403 - Collaboration with Barry Wilson Then in May 2017, NGC 2403 came up on the schedule for the widefield rig at DSW - a Takahashi FSQ 106/QSI 683. 17 hours of data were collected - NGC 2403 from DSW - new data I thought it might be a wizard wheeze to combine the two sets of data - essentially applying the higher resolution of the UK collaboration with the widefield view from DSW. Registar made this a relatively straightforward task. After that it was some fiddling around in Photoshop. The data were captured in March and May 2017. The total amount came to 26.3 hours.
  3. alan4908

    NGC2403

    From the album: Deep Sky

    Imaged in Dec 15/Jan15 with a SW ED80 and Trius SX26C. Although this spiral galaxy is relatively small in my field of view, I was impressed by the core details but less impressed by the dust lanes and Ha regions. I think I will reprocess the image when I've acquired some additional Ha data. LIGHTS: 53 x 600s; DARKS: 30; BIAS:100; FLATS:40.
  4. I imaged the spiral galaxy NGC2403 during the infrequent clear skies during Dec/Jan. Although it is relatively bright, I decided to go for a reasonably long exposure with my OSC. Given the relatively wide field of view of my imaging set up and the relatively small size of the galaxy (23 x 12 arc minutes) I was pleasantly surprised by the amount of detail of the core but disappointed that the dust lanes and Ha regions didn't show up a little more. Since I've now acquired a Ha filter and filter wheel, I think I'll give it another reprocess when I acquire some Ha. LIGHTS: 53 x 600s; DARKS: 30; BIAS: 100; LIGHTS:40. Alan
  5. Having now acquired some data with my new 3nm Ha filter with my OSC (in bright moon conditions), I thought I'd have a go at reprocessing my recent post of the spiral galaxy (NGC2403). Basically, this was an experiment to see if I could successful image via a narrowband Ha filter with my OSC CCD and get improved results. For those that might be interested, I added the Ha data to the red channel and then blended the data via the PS blending mode Lighten. I also decided to only add the Ha data to the galaxy core since I was concerned about distorting the starfield colours. My conclusion is that it appears to enhance the image. However, next time I will wait until the moon is a little less bright. LIGHTS: 53 x 600s + 3 x 1800s Ha, DARKS: 30; BIAS: 100; FLATS: 40 all at -20C. Alan
  6. Toxophilus

    NGC2403

    From the album: Deep Sky Objects

    NGC2403 - Taken over a couple of nights,both affected by cloud and my tracking was not as good as it should be, so the final result is not as sharp as I had hoped.
  7. From the album: Deep Sky

    This was the first image incorporating data from my new 3nm Ha filter (3 x 1800s) and was a bit of an experiment. The image is identical to the other NGC2403 apart from the incorporation of Ha data. The Ha data was added by blending the Red channel of the original (RGB) OSC image with the Ha image using PS Lighten. The Ha data was only applied to the galaxy core since I was concerned about unbalancing the star colours. Incorporating Ha data in this way yields the Ha as an "electric pink" colour in the final image. Since this be very dominating, I reduced the effect. Overall, I prefer the result to the non-Ha version.
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