Probably the most famous open cluster, visible by the naked eye is called Pleiades, Subaru, or Seven Sisters. Charles Messier cataloged this DSO under number 45 (M45). This cluster is located in the constellation Taurus. It’s the closest cluster to the Solar system (430 light years), has 8 light years in diameter and it’s characterized by the nebulosity – reflective illumination of the space dust by the blue light of the hot, young stars. The brightest stars have names: Alcyone, Atlas, Electra, Maia, Merope, Taygeta, Pleione, Celaeno, and Sterope.

M45 Pleiades

Telescope:Newton 254/1000 mm
Aperture:254 mm
Focal length:730 mm
MountGemini G53f
AutoguidingZWO 174MM, TS 60/240 mm
Camera:Moravian instruments G2 8300M @-30C
Corrector:ASA 2" reducer 0.73
Filters:Baader LRGB
Exposure:24xL 300 s bin 1x1, 16xRGB, 200 s, bin 2x2