M3 - small experiment (Ian Dixon)

M3 - small experiment

Revision title: Further processing with Luminance, Deconvolution (starnet mono mask, Hartmut style psf) and curves transformation.

June 3, 2022

M3 - globular cluster

This was part of our recent gathering at Sandilands park south - I imaged in southern Manitoba, only a few dozens of km from the the Minnesota border. I wrapped up imaging at 3 am, drank off a coffee, and made it home by 4:30 am.

Thanks to Dave Moug, Ryan W, and Kevin Black - we were without the rest of the Kevins (Kev G and Kev W) this time, so the usual crew of stalwarts were reduced somewhat. Next time..

Very short integration of only 40 min, this was an experiment to test a few tweaks to my gear.

120 mm apo
GTO 900 Astrophysics mount
2600 mc pro camera
ASI Air Pro Raspberry Pi processor

Imaging:
20 x 120 sec exposures (40 min integration)
20 flats
80 bias
20 new darks, matched for duration and camera temp - shot in my office (darkened)

Thanks to Dave Moug, Ryan W, and Kevin Black for usual help and advice.

M3 features
- its located in Canes Venatici
- quite bright
- contains about 0.5 million stars
- 8 billion years old, lots of old red stars in this globular cluster.

These critters are difficult to render properly -> next time I will decrease my gain and limit the exposure time to 60 sec.

Thanks for looking, and for making it all the way to the bottom.

Original
B
Final
C

B

Title: Restacked with proper flats and darks

Description: Restacked and reprocessed... I squeezed more of the older red stars from this glob into something that can be seen.

Uploaded: ...

C

Title: Further processing with Luminance, Deconvolution (starnet mono mask, Hartmut style psf) and curves transformation.

Description: I have tried to "unburn" the core to reveal more stars. I used help from KathyNS, thanks Kathy. :0)

Its the first time that I have successfully made a decent deconvolution run on an image... thats a big deal for me, ha ha.

Uploaded: ...

Globular Star Clusters
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Status	Advanced success
Started	...
Astrometry.net job	5856770
PixInsight job	3DDGBYDGQ131UH3D0N582TJJ828IH4QQ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h42m18s.398
RA (top/left)	13h41m01s.500
RA (top/right)	13h39m02s.811
RA (bottom/right)	13h43m33s.932
RA (bottom/left)	13h45m35s.908

Dec (center)	+28°22′31″.75
Dec (top/left)	+29°16′14″.75
Dec (top/right)	+27°46′16″.99
Dec (bottom/right)	+27°28′44″.66
Dec (bottom/left)	+28°58′29″.60

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