Some photos

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Xelasnave.1947, Sep 23, 2019.

  1. Xelasnave.1947 Valued Senior Member

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    Omega Centuri by is 15800 light years distant and 150 light y are diameter.
    Centurus A 13 million light light years distant 48,000 light years diameter.
    Alex
     
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  3. elte Valued Senior Member

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    I'm imagining there are planets circling stars in Omega Centuri.. Andromeda Galaxy (m31) appears about the size of the moon in the sky. Centurus A is six times farther away and a fifth the distance across, so appearing one thirtieth the size of the moon in the sky (however not visible to the unaided eye because of faintness).
     
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  5. Xelasnave.1947 Valued Senior Member

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    I can see Omega Centuri with naked eye.
    Alex
     
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  7. elte Valued Senior Member

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    A month ago or so, I saw a star that appeared to have a bit of a greenish tint, which supposedly is an optical illusion because of red light being present nearby. But if a certain gas cloud happened to be near a white dwarf, could its atoms' electrons absorb light energy from the star, get bumped up to a higher energy state, and emit green light as they drop back lower again. Reminds me of glow-in-the-dark items common back in my younger days. Expose them to bright light and then with the light removed, they emit a glow having a bit of a green hue.
     
  8. Xelasnave.1947 Valued Senior Member

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    I think that may occur but I am not sure what I know here and would need to research to assemble what I know. ...
    Alex
     
  9. Xelasnave.1947 Valued Senior Member

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    This is another high ISO using short exposures 150 at 20 seconds each..no darks as I am looking for noise and how processing will reduce it.

    This is the Eta Carina Nebula (same as in posts 136 and 137) using the Nikon D5500 and its cheap two hundred dollar lens, noting that the image in 136 and 137 uses a two thousand dollar plus lens (telescope) and a three thousand dollar camera set up.

    Its not the best image and in time I could get better however the central Key Hole Nebula is clearly visible and that is not too bad really.
    I don't know why I cant bring out better colour and this had a very decent histogram...I am thinking maybe a step

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    n the Star Tool process is doing something and I am not picking up on it...
    Alex
     
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  10. Xelasnave.1947 Valued Senior Member

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    Antares..the Orange star in the Scorpian..same as above but this came out rather well I thought...the dust and nebulosity came out ok...this colour is how it came from the camera...so?
    alex

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  11. Xelasnave.1947 Valued Senior Member

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    I was going to throw this data out...it is the RunningChicken.
    The data had various issues...one channel showed oval stars which must have happened due to a cable dragging a little..maybe..anyways one that count alone it was going to be thrown out...also I missed including the chickens head...so I started again on the object and now have about 7 hours of data with the head included...I hope.

    I have very few details..HEQ5 mount, 80 mm Espirit triplet telescope with field flattner/reducer effective focal length 400mm.ZWO 1600 cooled Mono camera.
    Ruffly 60 minutes 60 second exposures at 200 gain in Luminance, 60 minutes 60 second exposure at 350 gain in Hydrogen Alpha, and 35 minutes 60 seconds in each of Red, Blue and Green.

    Stacked at 2x drizzle in Deep Sky Stacker, Initial process in Star Tools, Coloured, merged and additional process in photo shop, and minor levels and curves adjustment in Gimp as well as additional contrast and brightness and colour adjustment and downsizing for posting.

    although the head is missing I may merge this image with the new one to come in Registar as it should manager that ok although the image will not have the head and will be only a better version of this photo.

    I did try to be thoughtful with the colour and I would appreciate someone telling me what colours they see

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    alex

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  12. Write4U Valued Senior Member

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    Alex, you are assembling a wonderful gallery here and you comments make the experience very informative.
    I look eagerly forward to everything you produce and explain.

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  13. Xelasnave.1947 Valued Senior Member

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  14. Xelasnave.1947 Valued Senior Member

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    The Running Chicken Nebula can be seen in the photo in post 166...it is the nebula second in from the right.

    alex
     
  15. Write4U Valued Senior Member

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    I see a reddish brown with pure white (black background)

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    Last edited: Apr 27, 2020
  16. Xelasnave.1947 Valued Senior Member

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    Well this points to the chicken being a Flamingo.
    alex
     
  17. Write4U Valued Senior Member

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    Lol, did revise it after some thought. Maybe the chicken was a Rhode Island Red...

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  18. Xelasnave.1947 Valued Senior Member

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    another wide field. at the top is the

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    Coal Sack and The Southern Cross.
    alex
     
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  19. Xelasnave.1947 Valued Senior Member

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    I am not sure if the small black blobs are artifacts or actualy dust ...alex
     
  20. Xelasnave.1947 Valued Senior Member

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    This is the same as in post 168 however this image is from 10 hours exposure all up ..

    Gear...Espirit 80mm, on HEQ5 unguided.

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    one minute subs, no darks or lights, ZWO 1600 cooled mono and I captured thru every filter

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    (7) although did not get more than 16 subs each of O11 and S11...I was going to get more but following nights would not permit cause of cloud cover...I hope to get more data for the second position as it was better framed...but I decided to work with both sets for practice. I still have not got the hang as to managing colour ...it is what it is.

    Stacked Deep Sky Stacker, Processed in Star Tools and Photoshop.

    alex
     
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  21. Xelasnave.1947 Valued Senior Member

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    I more inclusive attempt at The Running Chicken Nebula.
    alex

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  22. paddoboy Valued Senior Member

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    Love looking at, pointing out to mates Crux and the pointers as they circle around the South celestial pole...along with the Jewel Box...all come up OK on a clear night with my 7x50's.

    Nice work Alex, keep it up!
     
  23. Xelasnave.1947 Valued Senior Member

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    Thank you Paddo for your kind encouragement.
    The photos are getting to me as I just can't make them right...There is so much in it and I find I am getting to a point where I am getting frustrated that I just can't produce a better quality image.

    Binos are very useful for astronomy. I have a 12 inch Newtonian on a dobsonian base which one would think is rather neat but I much prefer using my 80mm binos as they give you the feeling you are there...the lower the magnification the more light you get and I think the 80mm Binos are only 20 times which I find is ideal. Mind you the Jewell Box at high magnification is really something.
    Now here is something I bet you don't know...what is represented by the angle between the Celestial South Pole and the Horizon? And if you do ..when did you find that out?
    Thanks again.
    Alex
     

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