Hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  IC 4645  ·  IC 4648  ·  M 92  ·  NGC 6323  ·  NGC 6327  ·  NGC 6329  ·  NGC 6332  ·  NGC 6336  ·  NGC 6341  ·  NGC 6344
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M 92 Globular Cluster, 



    
        

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M 92 Globular Cluster

Getting plate-solving status, please wait...
M 92 Globular Cluster, 



    
        

            star-watcher.ch
Powered byPixInsight

M 92 Globular Cluster

Acquisition details

Dates:
April 27, 2022
Frames:
Astronomik UV-IR Block L-3 Clip Filter: 94×90(2h 21′) ISO1600 f/5
Integration:
2h 21′
Darks:
34
Flats:
52
Bias:
37
Avg. Moon age:
26.28 days
Avg. Moon phase:
11.51%
Bortle Dark-Sky Scale:
5.00
Temperature:
9.00

RA center: 17h16m53s.58

DEC center: +43°1033.6

Pixel scale: 1.292 arcsec/pixel

Orientation: 41.626 degrees

Field radius: 1.077 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 4983x3328

File size: 8.3 MB

Locations: Derendingen 454m, Solothurn, SO, Switzerland

Data source: Backyard

Description

So, this is a bad example of an astro image :-(
My DSLR almost slipped out of the focuser during handling on it. Fortunately I holded my 70D in both hands as it began to move... a very bad feeling ;-)

Maybe I lost the collimation during that action or it was tilted in the focuser afterwards... but there is strong coma in the corners...

And maybe I need to loosen the primary mirror holder pads a bit more, since the stars have an strange shape in the right upper corner.

And I guess I moved the primary mirror upwards in secondary mirror direction while collimating the scope with all 3 collimating knobs...
Does anybody knows what happens if the primary mirror is a bit nearer to the secondary mirror (I'm talking about 2-3mm)???

Comments