SH2-155_BiColour_2022-08-30

This is my 2nd image taken in the Cepheus region of the night sky. I had a few issues earlier on which delayed me for about an hour so I had to stay out later then I wished, 3:00am. Rather than wasting more time with a meridian flip I let it run for an hour pass the Meridian which didn’t seem to cause any issues. This object is faint and would have benefited from an increase in the subs by 1-2 min. As a result of only using 4min subs a lot of time was spent in processing to keep the noise under control.

 

SH2-155 (Sharpless 155) the Cave Nebula is made up of a combination of areas of emission/reflection/dark Nebula. It lies in the constellation of Cepheus at a distance of approximate 2,400 ly with a visual mag of 7.7. The Cave refers to the area of ionized Ha where star formation is actively ongoing.

 

EQUIPMENT:-

Explore Scientific 102mm F7 APO Carbon

Explore Scientific 0.7 Focal Reducer

Skywatcher AZ-EQ6 GT

ZWO ASI1600mm-Cool cmos camera

Orion Mini Auto Guide

Astronomik 6nm Ha Filter

Astronomik 6nm Oiii Filter

Chip Temp Cooled to -20 degC

 

IMAGING DETAILS:-

SH2-155 Cave Nebula (Cepheus)

Gain 139 (Unit Gain)

Dithering

30 Ha subs@240sec (2h 00min)

30 Oiii subs@240sec (2h 00min)

Total imaging Time 4h 00min

20 Darks

25 Flats

 

PROCESSING/GUIDING SOFTWARE:-

APT "Astro Photograph Tools"

DSS

PS CS2

Done