62 NOVEMBER 2019 • SKY & TELESCOPE
M52
M103
King 1
King 2
King 3
King 4
King 12
King 13
King 14
King 15
King 16
King 20
King 21
King 19
o
l
`
g
_
d
a
p^2
s
b
¡
d
CASSIOPEIA
PERSEUS
CEPHEUS
2 h 30 m 2 h 00 m 1 h 00 m 0 h 00 m
+60°
+55°
1 h 30 m 0 h 30 m 23 h 30 m
p^1
St
ar
m
ag
ni
tu
de
s 2
3
4
5
6
7
Cassiopeia
Open Clusters
pKING 1 Moving into Cassiopeia,
King 1 stands out from the fi eld. The
brighter stars in the cluster form a small
asterism resembling a kite with a tail —
can you see it? — with some haziness
among the stars.
Mv = 19.3 | S = 9′ | No. = 100 |
Tr = II2r | Mag. = 337×
uKING 2 Located some 26′ northeast of Eta (η)
Cassiopeiae, King 2 is visibly smaller than King 1 and
seems to stand out from the fi eld. I noted only three
brighter stars with a hazy glow around them.
Mv = 19.8 | S = 4′ | No. = 40 | Tr = II2m | Mag. = 337×
uuKING 12 I fi nd that this cluster displays a fairly large
range of brightnesses, and I would classify it as II3p.
Mv = 9 | S = 3′ | No. = 15 | Tr = II1p | Mag. = 73× and 272×
pKING 3 Also known as NGC 609, King 3 is quite faint, adjacent to and slightly northwest of a pair
of 9th-magnitude fi eld stars. I can only resolve a few stars.
Mv = 11 | S = 3′ | No. = 77 | Tr = II3r | Mag. = 282×
qKING 4 Look for this cluster 2′
to 3′ southwest of 9th-magnitude
HD 15979. I caught a hint of it at 77×.
With 337×, it was open and spread
out, concentrated toward the center
with a wide range of star brightnesses,
and poor-to-medium in numbers, as
per its Trumpler rating.
Mv = 10.5 | S = 5′ | No. = 44 | Tr = III1p |
Mag. = 77× and 337×
HD 15979
5 ′
5 ′
5 ′
5 ′
5 ′