NGC6888_Bi-Colour_21-6-2018

This image is the "Crescent Nebula" in Cygnus. Frist the excuses, this was taken on the shortest night of the year and I could barely make out the Milky Way running through Cygnus, at Lat 51 deg it doesn’t get truly dark again till mid July. I took this over 2 nights between 00:00 and 2:20.

I usually just use the Ha as a luminance layer but I noticed that there was quite a bit of detail in the Oiii. I Ended up using “Deep Sky Stacker” to combine my processed Ha and Oiii to create a Ha/Oiii luminance Layer. I tried to find a way of creating this in photoshop C2 but couldn’t find one.

 

“If anyone out there knows of a better way to create a combined Ha/Oiii luminance Layer please let me know.”

 

Object Description:-

NGC 6888 the Crescent Nebula is in the constellation of Cygnus and approximate 5,000 ly from earth with a visual mag of 7.4. It structure is formed by the star shedding its outer layer in a strong stellar wind interacting with slower moving material shed at an earlier time. The star is at the end of its stellar life and will eventually result in a Supernova.

 

EQUIPMENT:-

Telescope Meade 6000 115mm and AZ-EQ6 GT

ZWO ASI1600mm-Cool cmos camera

Orion Mini Auto Guide

Astronomik 12nm Ha Filter

Astronomik 6nm Oiii Filter

Chip Temp Cooled to -20 degC

 

IMAGING DETAILS:-

NGC 6888 Crescent Nebula (Cygnus)

Gain 139 (Unit Gain)

33 Ha subs@300sec (2h 45m)

24 Oiii subs@300sec (2h)

Total imaging Time 4.45h

Dithering

20 Darks

20 Flats

 

PROCESSING/GUIDING SOFTWARE:-

APT "Astro Photograph Tools"

DSS

PS CS2

Done