The Butterfly Cluster, M6,
in Scorpius Comments
A map of the star field. Magnitudes are given without
a decimal point, e.g. 67 is to be interpreted as magnitude 6.7.
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
(c) Copyright 1998 Benjamin Crowell. All right reserved.
Photos from the Digitized Sky Survey, stdatu.stsci.edu/dss/dss_form.html
Sky maps created by Your Sky, www.fourmilab.com