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Details:
The Diamond Ring Nebula, is at a distance of approximately 5400 light years.
It was discovered by William Herschel on 17th July 1784
Here is lots of good informations and better images :
https://www.deepskycorner.ch/obj/ngc6894.en.php#fig-3
https://www.spacecentre.co.uk/news/space-now-blog/william-and-caroline-herschel/
Time: 00:50UT 2026-05-06 Filter & Exp. R(18x30) G(12x65) B(8x125) Sec
Tel: C14 @ f/4.1 ST-7 CCD @ -25°C 1.28"/pix Paramount GT-1100S
Odd Trondal Obs.code 238 (Uranium). Oslo Norway.
I also used H-Alpha & O III filter in the animation
(O III is emission from thin O++ plasma and H-Alpha, from H+ ( H II) ),
and remember "Physics is everything" ref. Don Lincoln
Software used:TheSky6,CCDSoft 5, MSB Astroart 2.0, 8.0, Paint
Previous Planetary Nebulae images :
The Blinking planetary Nebula (NGC 6826) in Cygnus
The Cat's Eye Nebula, NGC 6543 in Draco
Planetary nebula M 57 in Lyra
The small ring nebula in the constellation Lyra
A planetary nebula in the constellation Cepheus
Photographer's website:
https://www.flickr.com/photos/odd_trondal/
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