NGC4725_LRGB_25-3-2020

This is a LRGB image of NGC 4725 Galaxy.

I Originally image this back in 2018 but due to the poor conditions I could only get 2 min RGB subs and 1 min luminance subs (3h total imaging time) and at the time promised myself I would return to this object. I originally started working on this back in March but got frustrated with it and moved on. I had forgotten I had the data until now and decided to give it another go, well this is it with longer RGB & Luminance subs with a combined total of 6h. I still had to discard some RGB subs and quite a few luminance due to the transparency of the sky or lack of it☹️. I discarded 30% my 2min luminance so I combined them with 43 of my best 1min Luminance subs from 2018.

I tell you one thing galaxies (well most of them) are fiddly little buggers to work on and I find they take a lot longer to process than nebulous so please 🙏 role on summer Nebulas.

 

Information:-

NGC 4725 is a Seyfert type galaxy suggesting an active galactic core containing a supermassive black hole. It’s a intermediate barred spiral galaxy which is approximate 40 million ly from earth. It has a visual mag of 10.1 and lies in the constellation of Coma Berenices.

 

EQUIPMENT:-

Telescope Meade 6000 115mm and AZ-EQ6 GT

ZWO ASI1600mm-Cooled camera

Orion Mini Auto Guide

ZWO L,R,G,B Filters

Chip Temp Cooled to -20 degC

 

IMAGING DETAILS:-

NGC 4725 Galaxy (Coma Berenices)

Gain 139 (Unit Gain)

43 Lum subs@60sec (43min) from 2018)

40 Lum subs@120sec (1h 20min)

27 Red subs@180sec (1h 21min)

22Green subs@180sec (1h 6min)

30 Blue subs@180sec (1h 30min)

Total imaging Time 6h

Dithering

20 Darks

No Flats

 

PROCESSING/GUIDING SOFTWARE:-

APT "Astro Photograph Tools"

DSS

PS CS2

Done