M 40

Winnecke 4
Observation data
Epoch J2000.0 Equinox J2000.0
Constellation Ursa Major
Right ascension 12h 22m 12.5s
Declination +58° 4' 59"
Apparent magnitude (V) 9.65 + 10.10
Distance 510 ly (156 pc)
Spectral type G0+F8
Other designations
M40, BD+56 1372, HD 238107 + HD 238108, SAO 28353 + SAO 28355, CCDM 12223+5805
In 1991 the separation between the components was measured at 51.7", an increase since Messier's time. Data gathered by astronomers Brian Skiff (2001) and Richard L. Nugent (2002) strongly suggest that this is merely an optical double star rather than a physically connected system.[2]

https://en.wikipedia.org/wiki/Winnecke_4

M 40

M 40 ＜おおくま座：二重星＞