"Messier 92 (M92) is a globular cluster located in the northern constellation Hercules. The cluster lies at a distance of 26,700 light years from Earth and has an apparent magnitude of 6.3. Its designation in the New General Catalogue is NGC 6341.
Messier 92 is one of the brighter northern globulars – both visually and in terms of absolute magnitude – and can be seen without binoculars under good conditions.
With an estimated age of 14.2 billion years – almost the same age as the universe itself – M92 is one of the oldest clusters known and possibly the single oldest globular in the Milky Way. The cluster has an extremely low abundance of elements other than hydrogen and helium, with only 0.5 percent of the Sun’s metallicity. 
Messier 92 occupies an area of 14 arc minutes of apparent sky, which corresponds to a linear extension of 109 light years.
M92 has a much denser core and is more difficult to resolve than M13.
The cluster is located about 16,000 light years above the galactic plane and 33,000 light years from the galactic centre.
Messier 92 also contains 10 X-ray sources within the 1.02 arc minute half-mass radius. Half of these are suspected to be cataclysmic variables, close binary stars that that have outbursts in brightness at irregular intervals as a result of one component, a white dwarf, accreting matter from the companion. As a result, an accretion disk forms around the white dwarf and outbursts occur when a portion of the disk falls onto the star.
The north celestial pole will come within a degree of M92 in about 14,000 years. Every 26,000 years, the Earth completes a precession of its axis and, during that cycle, the pole moves near M92. M92 was last a pole cluster back in 10,000 B.C. Currently, the pole is pointing toward Polaris, Alpha Ursae Minoris, the brightest star in Ursa Minor constellation." https://www.messier-objects.com/messier-92/

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Trying to finish old projects, this time I decide process M 92, in which Maurizio did several sessions from our backyard mostly in April and May 2020.

It was done a normal stack and then a 2 drizzle stack only in DSS.  A cropped version was used for do all the usual workflow. In that time Maurizio did not use dittering, and that is reflected in the stacked results. the blue channel show the worst vertical/oblique lines ever. Also some stars shows some sort of outer halo that I could not avoid/fix.

The bright center of the cluster  should be manage with care, and I think would be safe taken into consideration when imaging do a scaled HDR frames like is used for M 42 for get the best of this fascinating cluster.

We would like to show a better work and hope in the future have better luck in this target.

Thank you for coming to visit us and see our work in progress,

Processed June 2022

https://twitter.com/AstroOtus/status/1547873510004912130