Pickering's Triangle

[alan4908]

Flemming’s Triangular Wisp is part of a supernova remnant in the constellation Cygnus. It was discovered in 1904 by Williamina Fleming but was credited to Edward Pickering, the director of the observatory and so is commonly known as Pickering’s Triangle. The object is part of a larger Cygnus Loop which occupies about 36 times the area of the full moon. It is estimated to be about 2400 light years distant and was formed about 15000 years ago.
The narrow band image below is a bi-colour representation with Ha mapped to red and OIII mapped to green and blue. It represents 16 hours integration and was taken with my Esprit 150.

Alan

LIGHTS: Ha:16, OII:16 x 1800s at -20C. 
 

[simmo39]

V Sharp!

[DaveS]

Some lovely colour and detail in there.

[Sunshine]

Wow, the contrast and detail are beautiful!

[alan4908]

21 hours ago, simmo39 said:

V Sharp!

Thanks - the apparent sharpness and contrast was probably helped through use of 3nm narrow band filters.

 

21 hours ago, DaveS said:

Some lovely colour and detail in there.

Thanks - I decided to separate the starfield out from the nebula to increase the impact of the nebula. StarXterminator does an excellent job !

18 hours ago, Sunshine said:

Wow, the contrast and detail are beautiful!

Thanks 

[Richard_]

Beautiful close up image there, Alan. Lovely colours, but I was surprised to read that this image uses an HOO pallette since typical examples I've seen look more orange and blue, than red and blue. 

Also, 1800s subs?! That's amazing! 

[alan4908]

21 hours ago, Richard_ said:

Beautiful close up image there, Alan. Lovely colours, but I was surprised to read that this image uses an HOO pallette since typical examples I've seen look more orange and blue, than red and blue. 

Also, 1800s subs?! That's amazing! 

Thanks for the comment Richard.

For this image,  HOO tends to give red and blue(ish) colours, however if you like orange you can change the green channel by mixing in some Ha - so typically you might go for say k1*OIII+ k2*Ha where k1 = 0.9 and k2 = 0.1. For narrowband images, I tend to start from a pallet that gives a generally pleasing appearance and then manipulate the hues during post processing.

Alan