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alan4908 last won the day on September 3 2020

alan4908 had the most liked content!

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About alan4908

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    Astrophotography ! ....at the moment I'm concentrating on deep space imaging
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    East Sussex

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  1. Thanks for the comment Peter Alan
  2. Located in Cygnus, I could only find a handful of images of this relatively bright nebula, so it appears quite a neglected target. What I particularly like are how the blue stars add colour contrast to the deep red of the emission cloud. This close up also reveals the dark structure in the central region. This LRGB image has an Ha blend into the red channel and represents 23 hours integration time, it was taken with my Esprit 150. Alan LIGHTS: L:27, R:21, G:20, B:20 x 600s; Ha: 17 x 1800s. FLATS:40, DARKS:20, BIAS:100 all at -20C.
  3. I also have the same weather sensor but use it in conjunction with ACP Expert. The Hitec Astro Weather has an ASCOM weather service object ID with the name HitecWeather.Weather - in order to set this up in ACP you simply tell it the ASCOM ID of the weather server and it then knows the state of the weather (Safe or Unsafe). Although I'm not familiar with Voyager, I'd have thought you be able to perform a similar set up. FYI - given the variability of the UK weather I use 20 mins before starting things again. Alan
  4. Thanks - I agree with your point on the detail, that's why I went for an imaging set up with the highest resolution I thought was practical for Deep Sky imaging given my local conditions - 0.7 arc seconds per pixel. Alan
  5. Thanks for the comment. On the tidal tail - I was expecting this to go all the way to the galaxy but it hit my noise floor quite a way out. I presume it still exists here but it must be much dimmer in this region. Thanks. Yes, I too really like how those HII regions have come out on the final image. Good luck with your future capture ! Thanks Peter. Thanks, I'm glad you liked it ! Alan
  6. Thanks for the comment Yes - that faint band of light to the left of the galaxy is the very long tidal tale . It doesn't often appear on images, probably because it is is very faint. As explained above, it was probably created c800 million years ago when M66 passed by and ripped stars and gas out of NGC 3628. Thanks - yes, I agree - I've often looked at images at this galaxy but never really paid as much attention to the amount of detail before. Alan
  7. Located in the Leo constellation, NGC 3628 is relatively bright, edge on spiral galaxy about 35 million light years away. Notable features are a broad equatorial dust band, which obscures the central region, and a very faint, 300,000 light years long, tidal tale of stars. It is also known as the Hamburger galaxy. The neighbourhood also contains two other large galaxies, M65 and M66, which together with NGC 3628 form the Leo triplet. Gravitational interactions with these galaxies are believed to be responsible for the warped disk and tidal tale. Spectroscopic analysis indicates that the s
  8. If you zoom in to a high degree on the unbinned (first) image you can see that all the stars suffer a severe elongation. You can also see that the noise is quite high and that the RGB colours and not quite correct. I suspect that the non-round stars are due to the fact that your guiding was not working and so the lack of roundness is simply a manifestation of your mounts tracking inaccuracy. If you look at the binned image, where you have decreased the overall resolution of the image, they appear more round. You can also fix this effect to a large degree in post processing - I'd sugges
  9. alan4908

    Deep Sky III

    Images taken with a Trius 814 and a Esprit 150
  10. Thanks for the comment - if you do attempt this, then I'd suggest quite long exposures for the outer arms since I found them very faint. Alan
  11. Thanks Lee - yes, NGC 4399 is very strange looking - looks a little like a planet made of stars. Well, given poor UK weather and the fact that I don't have a clear horizon, it does take me rather a long time to get this amount of data. Due to these two factors, I do rely on my automated imaging set up a lot ! Thanks !
  12. NGC 4395 is low surface brightness dwarf galaxy about 14 million light years distant in Canes Venatici. Although visually dim, the apparent size of the galaxy is quite large, about 13’ x 11’. Unusually, it does not have a central bulge of stars in its central core and is significantly variable in X-Ray emissions with luminosity emissions varying by a factor of two within 300s. Three star forming regions, have separate designations (NGC 4401, 4400, 4399). Most galaxies contain central black holes and radiation is produced as objects fall into them. For NGC 4395, the core is extremely dim
  13. Good luck with your capture ! Thanks Paul. Yes, a long focal length helps and also small camera pixels. With my Esprit 150 and my Trius 814 camera set up, I'm at 0.7 arc seconds/pixel which gives me quite a high resolution imaging set up. Thanks for the comment Lee
  14. Thanks - yes , it doesn't appear very often on SGL, perhaps because of its small apparent size Thanks - its definitely worthy of more attention that it currently seems to get. Thanks for the comment. Thanks - if you are going to attempt this just be aware of its small apparent size. Thanks Peter. The tidal tail is very, very faint - even with my quite dark skies and 600s subs its only just above the noise floor . Alan
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