Messier 18

18 final

Object:   M18 (NGC 6613) Date:               2018 August 31
Type:  Open cluster
Constellation:           Sagittarius Time & altitude:          21.20 UT    18º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                18h 20m Transparency (5 high):                   2/5
            Dec:                -17º 08 Telescope:     0.5m f4.1  Dob.
            Magnitude     6.9 Eyepiece       17mm Ethos              x120
            Size (mins)    9 Filters:            None


As is often the case at this time of year, transparency overhead is good with NELM better than 5.5m and Milky Way on view but below about 30 degrees it becomes progressively milkier.

A sparse cluster with 10 stars of similar brightness in two straight lines, plus a few faint sprinkles. The drawing records the principal stars.