NGC7635_Bi-Colour_28-7-2019-v4

This is probably the first of many objects I will be revisiting to add some new data to existing data.

I’ve replaced the old Oiii data and added 25 Ha 6min subs to the existing 24 5min subs I took back in 2017 giving me 4.5h of Ha data. Was it worth it? At first no! but after the 4th attempt I realised it was me over processing the image, again! will I never learn, probably not. I'm happy with it now.

 

Note:

The Oiii data needed replacing as the original was not taken with a CCD filter.

 

NGC7635 the Bubble Nebula in the constellation Cassiopeia. It is located at a distance of between 7,100 and 11,000 light years with a visual Magnitude of 10. The "bubble" is created by the stellar wind from a massive hot 8.7 magnitude young central star. The nebula is near a giant molecular cloud which contains the expansion of the bubble nebula while itself being excited by the hot central star.

 

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:-

NGC7635 Bubble Nebula (Cassiopeia)

Ha Gain 139 (Unit Gain)

Oiii Gain 200

24 Ha subs@300sec (2h) Data from 2017

25 Ha subs@360sec (2.5h)

24 Oiii subs@300sec (2h)

Total imaging Time 6.5h

Dithering

20 Darks

20 Flats

 

PROCESSING/GUIDING SOFTWARE:-

APT "Astro Photograph Tools"

DSS

PS CS2

Done