Messier 93

Object:   M93 (NGC 2447) Date:               2019 February 10
Type:              Open cluster
Constellation:           Puppis Time & altitude:          21.55 UT  15º
Catalogue data: Seeing (5 high):                               3/5
            R.A:                7h 45m Transparency (5 high):                   4/5
            Dec:                -23º 52 Telescope:     0.5m f4.1  Dob.
            Magnitude     6 Eyepiece       17mm Ethos              x120
            Size (mins)    22 Filters:            None


Observed near culmination but only 15° above the horizon. This cluster is smaller than M41 seen earlier this evening and fits in the 17mm’s 50 arcmin field with space all around to frame it. The surrounding field is richer in stars than is the case with M41 and bright stars are absent from the cluster itself, so the overall effect is much more subdued. There are no bright stars in the field. The cluster stars appear to have a small magnitude range centred on about 13th magnitude.  Maybe 100 stars are assembled mainly into two parallel oblongs aligned WNW-ESE. The S oblong is around twice the size of the N one. Apparently this cluster is sometimes called the Butterfly. I don’t see any hint of a butterfly pattern. This cluster is barely visible in the 50mm finder scope.