Results 1 to 3 of 3
Like Tree20Likes
  • 9 Post By Mr_Astro
  • 9 Post By not_Fritz_Argelander
  • 2 Post By Eagleheaf

Thread: M20 ,the Trifid Nebula colors

  1. #1
    Mr_Astro's Avatar
    Mr_Astro is offline White Dwarf
    Points: 2,453, Level: 32
    Level completed: 2%, Points required for next Level: 147
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!365 Days+ Registered Achievement!First 1000 Experience Points
    Join Date
    Oct 2015
    Location
    SA
    Posts
    41
    Points
    2,453
    Level
    32
    Thanks
    4
    Thanked 1 Time in 1 Post
    Downloads
    1
    Uploads
    0

    Question M20 ,the Trifid Nebula colors



    Hello,

    I took an image for M20 (the Trifid Nebula) - attached..
    I noticed that the nebula has a creamy look.. especially in the red part.
    first, I thought I have something wrong in my processing workflow.. but I have reviewed some of this nebula images in the web.. they are all have this soft colors paintings ( give feelings of 2D not 3D ) ..
    Any scientific explanation please ?

    Thanks
    Attached Images Attached Images
    Skywatcher Refractor ED100, Orion Refractor 80mm,Orion Atlas EQ-G mount, Lacerta M-GEN, Canon 700Da, Astronomik CLS filter..

  2. The Following User Says Thank You to Mr_Astro For This Useful Post:

    Brodavid1953 (08-13-2017)

  3. #2
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now HYPER GIANT
    Points: 136,605, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Thread Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    16,315
    Points
    136,605
    Level
    100
    Thanks
    6,711
    Thanked 37,625x 11,668 Posts
    Blog Entries
    37
    Downloads
    0
    Uploads
    0

    Default Re: M20 ,the Trifid Nebula colors

    First if all the nebula itself is much smoother than it appears in your image. The dark lanes that cross the pink creamy region are all foreground dark clouds obscuring the pink creaminess behind it.

    Also the degree of creaminess depends on your imaging setup and how capable it is at rendering low contrast details.

    Here is an image that shows a lot more internal contrast resolution
    http://www.cosmotography.com/images/...pha_region.jpg

    If you look at this image you'll notice that the center of the nebula is less saturated kind of hollowed out. That doesn't show up in your image.

    The basic physics is that of the Stromgren Sphere
    https://en.wikipedia.org/wiki/Strömgren_sphere

    Differences in intensity reflect differences in density. Sometimes you have to take into account seeing dark clouds backlit against a bright cloud.

    Another example is the NA and Pelican nebulas. They are, if I remember right, one nebula. The dark between them is a dark cloud in from that hides that they are really one object.
    Practice does not make perfect. Practice makes permanent. Perfect practice makes perfect. Faulty practice makes errors.

  4. The Following 7 Users Say Thank You to not_Fritz_Argelander For This Useful Post:

    Brodavid1953 (08-13-2017),chas53 (08-14-2017),combat48 (08-13-2017),dagadget (08-15-2017),Eagleheaf (08-15-2017),helicon64 (08-13-2017),MarcoS (08-15-2017)

  5. #3
    Eagleheaf's Avatar
    Eagleheaf is online now Silver Supporters
    Points: 29,584, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 53.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Feb 2017
    Location
    Oakwood, Illinois
    Posts
    4,437
    Points
    29,584
    Level
    100
    Thanks
    3,262
    Thanked 2,203x 1,529 Posts
    Downloads
    6
    Uploads
    0

    Default Re: M20 ,the Trifid Nebula colors

    Quote Originally Posted by not_Fritz_Argelander View Post
    First if all the nebula itself is much smoother than it appears in your image. The dark lanes that cross the pink creamy region are all foreground dark clouds obscuring the pink creaminess behind it.

    Also the degree of creaminess depends on your imaging setup and how capable it is at rendering low contrast details.

    Here is an image that shows a lot more internal contrast resolution
    http://www.cosmotography.com/images/...pha_region.jpg

    If you look at this image you'll notice that the center of the nebula is less saturated kind of hollowed out. That doesn't show up in your image.

    The basic physics is that of the Stromgren Sphere
    https://en.wikipedia.org/wiki/Strömgren_sphere

    Differences in intensity reflect differences in density. Sometimes you have to take into account seeing dark clouds backlit against a bright cloud.

    Another example is the NA and Pelican nebulas. They are, if I remember right, one nebula. The dark between them is a dark cloud in from that hides that they are really one object.
    Wow. I just caught this thread. I had to comment a Thank you nFA. That was very interesting information regarding these nebula. Thank you Sir.
    Mark

    92 Messier, 4 Planets, other cool stuff.
    Es126fcd100, Sw100edPro, Es80, Lxd75 8, 127MakSlt. kk ortho set, pentax xw's, TV pan, leitz periplan, leica HC, meade.
    Swaro 10x30, pentax 8x43, obie 25x100.
    Mounts for all.

 

 

Similar Threads

  1. Lagoon nebula and Trifid nebula
    By wargrafix in forum Astrophotography Forum
    Replies: 2
    Last Post: 08-28-2014, 05:02 PM
  2. is seeing colors in nebula possible?
    By tbagg35 in forum Astronomy Beginners Forum
    Replies: 18
    Last Post: 09-04-2013, 07:38 PM
  3. M20 Trifid Nebula, Lagoon Nebula, and M81-M82
    By jghops in forum Astrophotography Forum
    Replies: 4
    Last Post: 06-22-2013, 04:10 PM
  4. Replies: 0
    Last Post: 09-05-2007, 02:10 AM
  5. Replies: 0
    Last Post: 09-04-2007, 02:04 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 07:09 AM.