IC 4720 4721 and BOSS supernova

[Shiraz (Ray)]

Hi

http://www.astrobin.com/full/268306/0/

The region around these galaxies has a very slight blue reflection nebulosity apparently due mainly to the bright star at the bottom of the field. It shows a similar pattern in my blue data and the blue DSS data, so is probably not an instrumentation artefact (see both heavily stretched blue images below).

Did not realise that there was a BOSS SN visible in IC4721 until I was recently processing the data. https://www.flickr.com/photos/43846774@N02/26264696420. The now orange-red SN (Ha is beginning to dominate) is shown in the leftmost panel of the second image below, along with a previous image from my old 200mm scope, taken some time ago.

used the ASI1600 CMOS with 60 second subs, gain 100, for lum and RGB - but left my hard drive PS at the country site, so do not know exactly how many subs or when - from memory about 400, but will fill in Astrobin details when possible. Thanks for looking. Regards Ray

[strongmanmike (Michael)]

...1min subs hey Ray? ...

Lovely image, I like the small galaxy that looks like it is overlapping IC4721 (but must be in the background) and what a bonus capture of the supernova too, nice work

Mike

[Placidus (Mike and Trish)]

Beautiful, Ray.

The sharpness of the galaxy is remarkable, and much improved on your archived version. We like the tiny galaxy visible through the big one.

This is perhaps the first image I've seen where some convincingly fine work is done using one of these CMOS chips in short time.

What caused you to look for the snr?

[Camelopardalis (Dunk)]

Stunning, Ray

[Atmos (Colin)]

A very nice shot Ray, quite a number of fainter tiny spiral galaxies just stating to shine through the darkness
The detail in the main galaxies is very pleasing indeed

[Shiraz (Ray)]

Originally Posted by strongmanmike

...1min subs hey Ray? ...

Lovely image, I like the small galaxy that looks like it is overlapping IC4721 (but must be in the background) and what a bonus capture of the supernova too, nice work

Mike

yeh, was chuffed when I realised there was a recent supernova in there. My understanding is that this pair of overlapping galaxies was one of many used to determine the distribution of gas and dust in typical galaxies.

1 minute subs are a bit taxing, but have advantages..

Originally Posted by Placidus

Beautiful, Ray.

The sharpness of the galaxy is remarkable, and much improved on your archived version. We like the tiny galaxy visible through the big one.

This is perhaps the first image I've seen where some convincingly fine work is done using one of these CMOS chips in short time.

What caused you to look for the snr?

Thanks M&T. This camera is sky-limited at about 45 seconds on my system, so short subs are the best way to go with broadband.
I only reaslised that the snr was there when I was looking for information on the galaxy pair.

Originally Posted by Camelopardalis

Stunning, Ray

thanks very much Dunk!

Originally Posted by Atmos

A very nice shot Ray, quite a number of fainter tiny spiral galaxies just stating to shine through the darkness
The detail in the main galaxies is very pleasing indeed

hi Colin. thanks for the comments - background galaxies are always nice to see.

regards Ray

[topheart]

Very interesting capture Ray!
Cheers,
Tim

[Shiraz (Ray)]

Originally Posted by topheart

Very interesting capture Ray!
Cheers,
Tim

thanks very much Tim!

[RickS (Rick)]

Another nice capture, Ray!

[Slawomir (Suavi)]

Awesome image Ray and what a bonus with spotting the supernova in your data.

I must confess that your images repeatedly made me look inquisitively at fast Newtonians...perhaps a nice fast 8-inch Newtonian would serve me well...I must resist! LOL

[Atmos (Colin)]

Originally Posted by Slawomir

Awesome image Ray and what a bonus with spotting the supernova in your data.

I must confess that your images repeatedly made me look inquisitively at fast Newtonians...perhaps a nice fast 8-inch Newtonian would serve me well...I must resist! LOL

There is a Tak 180mm F/2.8 in the classifieds

[Shiraz (Ray)]

Originally Posted by RickS

Another nice capture, Ray!

thanks Rick!

Originally Posted by Slawomir

Awesome image Ray and what a bonus with spotting the supernova in your data.

I must confess that your images repeatedly made me look inquisitively at fast Newtonians...perhaps a nice fast 8-inch Newtonian would serve me well...I must resist! LOL

it was nice to see the sn. Newtonians are nice scopes, but they can be a bit temperamental - so can their users at times

Originally Posted by Atmos

There is a Tak 180mm F/2.8 in the classifieds

doesn't the Epsilon series have really big spot sizes - really fast, but best for low res wide field with big pixels, not small ones?

regards Ray