Michael A. Stecker
mastecker@gmail.com



 
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Sh2-308 "Dolphin Head Nebula"
(with Oxygen-III data)
file:Sh308DH-JRF-HRGBOIIInu2A-MAS1x2b.jpg
 .
 Bluer version at:
...Sh308DH-JRF-HRGBOIIInu2A-MAS1x2.jpg

Photographic Data
 telescope:
Sky-Watcher Quattro 250P, 10-inch f/4 Newtonian telescope (FL= 1,000 mm)
 
mount and guiding
Astro-Physics 1200 GTO

 imaging camera:
ZWO ASI2600MC-Pro color astro-camera.  Imaged on September 17, 2023.

exposure:
 ?

guiding:
SVBony 60 mm f/4 guide scopr (FL= 240 mm) with ZWO ASI1200Mini guide camera
 
processing
Aquired and stacked by James Foster with Maxim DL.  Post-processed in Adobe Photoshop Elements by Michael Stecker.
 .
photographic site:
James Foster's observatory at Frazier Park California
 https://en.wikipedia.org/wiki/Frazier_Park,_California
(Bortle 4 at 5,500 feet elevation)
 
 
 

James Foster's version: HaRGB plus Oxygen-III filtered light
file: nuDolphin-HRGBOIIInu2A.jpg
 
 
 
 
 
 
 
Sh2-308 "Dolphin Head Nebula"
(without Oxygen-III data)
file: Sh2-308DolH-JRF10NewtHaRGB112023-ymbg.jpg
 
 
 
 
In Memorium
White Feral cat at James Foster's observatory
June, 2023 - November 24, 2023 
 
White feral cat disappeared from James Foster's property on the same night he photographed the Dolphin Head nebula in Oxygen-III light.