Messier 92

Object:   M92 (NGC 6341) Date:               2018 September 14
Type:  Globular cluster
Constellation:           Hercules Time & altitude:          19.50 UT    66º
Catalogue data: Seeing (5 high):                               2/5
            R.A:                17h 17m Transparency (5 high):                   4/5
            Dec:                43º 08 Telescope:     0.5m f4.1  Dob.
            Magnitude     6.5 Eyepiece       8mm Ethos                x260
            Size (mins)    11 Filters:            None


Great to see a globular closer to the zenith than the horizon after all the compromised views in Sagittarius. This one fills about a quarter of the field, so about 6 arcmins across. There are lots of bright outliers in the outer halo, possibly foreground stars, but this seems unlikely given the low density of the general star field further out from the centre. The inner halo is resolved but I don’t have resolution in the core, which is about one-third the diameter of the inner halo. On the E side there is a straight line of stars marking the outside edge of the inner halo and there is a dark patch following that. At x260 M92 looks very similar to M13 at x120