2 Cor Caroli (Al­pha (_) Canum Ve­nati­co­rum)

Sky at Night Magazine - - OBSERVING -

A ra­di­ant pair with 19.3 arc­sec­onds of sep­a­ra­tion, Cor Caroli makes for an easy split at lower pow­ers. The bright­est point of light in the con­stel­la­tion of Canes Ve­natici, the Hunt­ing Dogs, Cor Caroli (the name means ‘Charles’s heart’) is easy to spot – it’s the bril­liant star 10° south and 10° west of Eta (d) Ursa Ma­joris, which marks the end of the Plough’s han­dle.

Both com­po­nents are spec­tral type A0 but their colours are not iden­ti­cal. They are mag. +2.8 and mag. +5.5 re­spec­tively, so iden­ti­fy­ing the com­po­nents is easy. At 62x mag­ni­fi­ca­tion, the A com­po­nent ap­pears creamy yel­low while the B com­po­nent comes across as a pale yel­low-green. Go to 185x mag­ni­fi­ca­tion, though, and the B com­po­nent takes on a pale blue-green tinge.

Cor Caroli (Al­pha (_) Canum Ve­nati­co­rum) Mag­ni­tudes +2.9 and +5.5 Sep­a­ra­tion 19.3”

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