M6, the Butterfly Cluster, in BinoSky, a guide to astronomy with binoculars.


BinoSky - best bets for stargazing with binoculars

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The Butterfly Cluster, M6, in Scorpius

A map of the star field. Magnitudes are given without a decimal point, e.g. 67 is to be interpreted as magnitude 6.7.

Comments
Worth looking at from a suburban or rural site, but not in the same class as its neighbor M7.

60-degree field of view

Data (Janes, Duke, and Lynga, 1987)

RA 17 40

dec -32 13

total V magnitude 4.2

NGC number 6405

Trumpler class II 3 r

angular diameter 20'

distance 490 pc

age (Myr) 78

integrated B-V .28

observed stars 331

earliest sp. class B5

brightest star 7.0

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	A map of the star field. Magnitudes are given without a decimal point, e.g. 67 is to be interpreted as magnitude 6.7.

	Comments Worth looking at from a suburban or rural site, but not in the same class as its neighbor M7.
60-degree field of view

Data (Janes, Duke, and Lynga, 1987)
RA	17 40
dec	-32 13
total V magnitude	4.2
NGC number	6405
Trumpler class	II 3 r
angular diameter	20'
distance	490 pc
age (Myr)	78
integrated B-V	.28
observed stars	331
earliest sp. class	B5
brightest star	7.0