Coma Cluster Rework

[DaveS]

Another rework, this time the Coma Cluster in LRGB using new Luminance calibration, and a different stretching, Using from the RGB stack rather than stretching the individual stacks.

I think I've managed to hold on to bore of the blue in the spirals than I had before.

I guess this is one for @tomato 😄

 

Edited April 15, 2022 by DaveS

[wimvb]

Excellent rework.

3 hours ago, DaveS said:

Using from the RGB stack rather than stretching the individual stacks.

Which image processing program do you use. Stretching the three masters before combination seems odd, but maybe necessary in some program?

[DaveS]

I use AstroArt 8. I think my processing of individual stacks is a habit that dates from earlier versions, before the DDP routine became more versatile. The latest DDP has much more control, so I think I will adopt the RGB combination *then* stack in future.

[DaveS]

As an aside, I checked on Stellarium, and those two searchlights blazing away are mag 7.15 and 8.15 . Most of the galaxies are around mag 13 or so.

[wimvb]

6 hours ago, DaveS said:

As an aside, I checked on Stellarium, and those two searchlights blazing away are mag 7.15 and 8.15 . Most of the galaxies are around mag 13 or so.

Magnitudes are funny things. I get the following:

Leo I:  10.0 (Simbad), 11.2 (Wikipedia) 

Leo II (Leo B): 12.0 (Simbad), 12.6 (Wikipedia) 

Leo III (Leo A): 13.26 (Simbad), 12.9 (Wikipedia)

M 81: 6.94 (Simbad and Wikipedia) 

Edited April 16, 2022 by wimvb
Corrected names and magnitudes

[vlaiv]

7 minutes ago, wimvb said:

Leo I (Leo A): 13.26 (Simbad), 11.2 (Wikipedia) 

Naming is also a funny thing:

https://en.wikipedia.org/wiki/Leo_A

Leo A (also known as Leo III)

(Same result in Simbad)

But yes, you are right - wiki lists result from NASA/IPAC Extragalactic Database - where entry is from 1991 - SIMBAD gives value from 2014 Spitzer data