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Astrophotography Globular Cluster

Astrophoto: Messier 92 – 06/24

My astrophoto of the rather rarely photographed globular cluster in the constellation Hercules: Messier 92. Now new: with session analysis!

There is a second Messier globular cluster in hercules beside Messier 13. It is Messier 92. This one is a bit smaller than M13 and i did not take a photo of it before this session.

I am still fighting some technical issues and therefore I switched to my Baader refractor instead of using the VC200L to keeps a few things a bit easier.

I did some backlash optimization on my mount before the session. But lets see what happend.

Session Analysis

Session Analyze - M92 - Messier 92 - Melotte 168 - NGC 6341
Session Analyze – M92 – Messier 92 – Melotte 168 – NGC 6341

I started the session around 23:20 and started to take photos after I did all the start-stuff. As you can see at around 23:30, I had bad guiding trouble (look at the red line). I tested it a few times but it did not get better.

A: At the “A” position I did some RA-axis backlash adjustments and started anouther try. As you can see at arount 00:20 I still had problems.

B: At the “B” position I did some Dec-axis backlash adjustments.

After that I was ready to go!

I started collection photos at 12,5°C and stopped in the early morning at about 9°C.
While shooting 300s subs the system did an automatic meridian flip and several refocus processes.

Full resolution on Astrobin:

Technical overview

TelescopeBaader Travel Companion 95/580
Focal Length590mm
Erecting LenseBaader M68 Field Flattener
CameraCANON EOS R(a)
Guiding EquipmentPegasus Astro Indigo OAG
Guiding CameraQHY 5-III-462C
MountSkywatcher HEQ5 Pro, Belt and Hypertuned
Photography Date06/09/2024
Exposure-Time Lights30×300
Correction framesFLATS, BIASES, DARKS
SensitivityISO 1600
Processing Date06/13/2024
Software StackStellarmate OS/EKOS/INDI, PixInsight, Affinity Photo
Capture PlaceKoblenz, Germany

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