M92 in Hercules is one of the most remarkable globular cluster of northern sky, even if it is often ignored in favour of M13, visible in the same constellation.
Its apparent dimension is 11,2’ and is magnitude is 6.3, so it can be found also with a small binocular under a dark sky.
M92 is located 26,000 light years from the solar system and
has a real diameter of 85 light years. Its estimated age is 13 billion years,
so it is one of the oldest known globular clusters.
Optic GSO RC12 Truss - Aperture 304mm, focal lenght 2432mm, f/8
Mount 10Micron GM2000 HPSII
Camera Moravian G3-16200 with external filter wheel 7 positions
Filters Astrodon Gen2 E-Serie Tru-Balance 50mm unmounted LRGB
Guiding system OAG Moravian M68 with guide camera Moravian G1-0301
Exposure details L 12x120" + 12x10", bin2 -20C
R 13x120" + 12x10". bin2 -20C
G 13x120" + 12x10", bin2 -20C
B 13x120" + 12x10", bin2 -20C
Total integration 1,8h
Acquisition Voyager, PHD2
Processing Pixinsight 1.8, DxO Photolab 3
Location Promiod (Aosta Valley, Italy), own remote observatory
Date 21 May 2020