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.
Image details
| Telescope: | Celestron EdgeHD 9.25 | |
| Length: | 1645mm | |
| Aperture: | 235mm | |
| F-stop: | f/7.0 | |
| Sessions: | 1 | |
| Captured: | 2022-07-28 to 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 |