Saturday, 25 March 2017

Leo Triplet - Finished

The night of the 24th of March was not completely clear but good enough to get the data I needed.

Here's the finished image - have always loved the eerie feeling of this group of galaxies - the one in the upper right is how I remember galaxies being depicted in all the science fiction books I read when I was young. The one on the left is worth zooming in on in the individual shots below. Details of capture parameters follow the pictures at the end of this post.



and each of these galaxies individually

M66



M65



And NGC 3268




Details
Object name
Leo Triplet
Object ID
M65, M66 and NGC 3628
Date(s)
21 and 24 March, 2017
Telescope
Altair 115mm
Camera
ASI1600MM
Luminance
8x5 min / 30x2 min / 1.6 hrs
Red
7x5 min / 35 min
Green
6x5 min / 30 min
Blue
8x5 min / 40 min
Ha
0
Oiii
0
Sii
0
Total time
3.4 hours
Frames
0
Processing
PixInsight / fully calibrated lights / Levels / Curves / SCNR only
Notes

The skies were not outstanding on either night of imaging this object. I am surprised at how good it turned out considering this.
There is an awful lot of vignetting on the luminance subs which was improved by reducing the exposure time from 300 to 120 seconds.

Alignment of the mount was problematic each night – because I kept aligning on the wrong star! Really must remember that when looking for a 1.4 magnitude star you WILL know it when it appears in on the screen – brighter than anything else besides another <1.4 magnitude star! :-)