Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: Roberto on Mar 11, 2021, 10:15:35

Title: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: Roberto on Mar 11, 2021, 10:15:35
Hello All

This was the main target I was working on since February.  I wish I had taken more luminance but the weather is not looking great for the rest of the week ahead so I decided to process and be done with it.

I had last imaged NGC4725 in 2005 and my current equipment is not really suited to small galaxies but I wanted to capture this beautiful spiral, its weird companion NGC4747 but most importantly, the faint planetary LoTr 5 - PK339+88.1.

For full details: https://www.astrobin.com/dcn0ps/C/?nc=user (https://www.astrobin.com/dcn0ps/C/?nc=user)

Check the annotated version for the many background galaxies and other brighter objects.

https://www.astrobin.com/full/dcn0ps/B/ (https://www.astrobin.com/full/dcn0ps/B/)

Roberto

(https://cdn.astrobin.com/thumbs/WNan34uYawSo_16536x0_85166Htd.jpg)
Title: Re: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: The Thing on Mar 12, 2021, 11:01:55
Very nice Roberto, and not a green galaxy in sight! The planetary nebula is lovely at full resolution and very unusual to see.
Title: Re: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: Roberto on Mar 12, 2021, 12:36:13
Thank you! Didn't mean to put you off with the galaxy colours!
The planetary is quite large but very faint also and a nice contrast to the more distant objects.

Roberto
Title: Re: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: MarkS on Mar 16, 2021, 15:57:15
I'm guessing LoTr5 is a pretty difficult object.

Mark
Title: Re: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: Roberto on Mar 16, 2021, 16:19:36
Mark

It needed 3+ hours to show nicely in OIII.  There is some Ha signal "I've been told" but I didn't capture any as it only shows in the "wings" outside the main OIII surface.  It's a large nebula so it must be very difficult to observe and yes, not a common object. It's got an interesting variable as its centre:  https://en.wikipedia.org/wiki/LoTr_5

Roberto
Title: Re: This was the main one - NGC4725 and others plus LoTr5 in Coma Berenices
Post by: NoelC on Mar 17, 2021, 19:52:40
Woweee - just look at those tiny galaxies trailing off into infinite...
Really exciting Roberto very well done, never seen this before.
Some odd artifacts around the stars which I suspect is due to the sharpening processes - obviously you are working with some very faint detail.  Very interesting subjects and loads of detail.

Noel