Gallery »  M40

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Charles Messier was looking for a nebula but found this double star instead. It is one of the few items in the catalog that isn't a galaxy, cluster, or nebula. He may have been searching for the two galaxies visible at the edge of this frame.
Telescope:   Celestron EdgeHD 9.25
Length:   1645mm
Aperture:   235mm
F-stop:   f/7.0
Sessions:   1
Captured:   2022-07-28
Lights:   10
Exposure:   120
Total exposure:   20 m
Ra:   12h 22m 0.0s
Dec:   +58° 04' 36.205
Size:   33.17 x 21.471 arcmin
Radius:   0.329 deg
Scale:   0.57 arcsec/pixel