Sky and Telescope - January 2018 - 54

JANUARY 2018 OBSERVING
Deep-Sky Wonders by Sue French

The Hidden Queen
Follow this map to the lesser-known treasures of Cassiopeia.

L

Let's begin with a trio of open clusters from the New General Catalogue
of Nebulae and Clusters of Stars that's
centered 1.7° northeast of Gamma (γ)
Cassiopeiae. A shallow, 1.4°-long arc
of three stars, 5th and 6th magnitude,

ast month we visited some of the
finest sights in Cassiopeia, but for
those who like to wander off the beaten
path, we'll now take a look at some
of the lesser-known wonders of the
mythological Queen.
2h 20m

2h 00m

1h 40m

50

+72°

1h 20m

1h 00m

0h 40m

0h 20m

0h 00m

40

Star magnitudes

Cr 463
48
42

+70°

t

3
4
5
6
7
8

31

+68°

s

Skiff 1

CASSIOPEIA

+66°

609

+64°
637

¡

Berk 4
King 16
Do 13

Berk 62

Eddie's
Coaster

HD 4841

559

g

HD 7156

+62°
IC 166

366
358

654
663
659

+60°

M103

225

136
189

a

b
433

JA N UA RY 2 018 * SK Y & TELESCOPE

12

Stock 24

381

Tr 1

r
54

146 133
King 14

Do 12

129

rests north of Gamma. If you follow it eastward, it will lead you to the
most obvious cluster of the crew, NGC
381. Through my 105-mm refractor
at 36×, it's a rich dusting of very faint
stars, with brighter sparks north of the
group's center and at its northern edge.
Northwestward in the same field of
view, NGC 366 and NGC 358 join the
scene as two small knots of faint stars.
Examining the clusters individually
at 174× helps tease out their pinpoint
specks of light. NGC 381 is spangled
with about 25 moderately faint to very
faint stars confined to 7′. NGC 366
offers only six faint to very faint suns
arranged in a 2.2′-tall Y, with the base
of the Y to the north and its southernmost star a close double. NGC 358 parsimoniously resolves into a 2′ trapezoid
of four stars, magnitudes 11.0 to 12.7.
My 10-inch reflector at 213× doubles
the number of stars in NGC 366, with
its glimmering Y sprawled across the
eastern half of the 3′-wide group. NGC
358 gains two extremely faint stars. A
line between them would run northnorthwest to south-southeast and bisect
the trapezoid. All six stars make a 2′ D,
belly southwest.
Although close together on the sky,
these star groups were discovered by different observers at widely spaced times.
Not surprisingly, they were found in
chronological order from most to least
prominent. William Herschel swept
up NGC 381 in 1787, and his son John
Herschel discovered NGC 366 in 1829.
Heinrich d'Arrest spotted NGC 358
in 1865 while observing NGC 366. As
you might suspect from its appearance,
NGC 358 is most likely an asterism
rather a cluster. Despite this ignoble



Sky and Telescope - January 2018

Table of Contents for the Digital Edition of Sky and Telescope - January 2018

Contents
Sky and Telescope - January 2018 - Cover1
Sky and Telescope - January 2018 - Cover2
Sky and Telescope - January 2018 - 1
Sky and Telescope - January 2018 - Contents
Sky and Telescope - January 2018 - 3
Sky and Telescope - January 2018 - 4
Sky and Telescope - January 2018 - 5
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Sky and Telescope - January 2018 - 7
Sky and Telescope - January 2018 - 8
Sky and Telescope - January 2018 - 9
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Sky and Telescope - January 2018 - 83
Sky and Telescope - January 2018 - 84
Sky and Telescope - January 2018 - Cover3
Sky and Telescope - January 2018 - Cover4
Sky and Telescope - January 2018 - SGA18SAL
Sky and Telescope - January 2018 - 90
Sky and Telescope - January 2018 - SGA18S
Sky and Telescope - January 2018 - SGA18SA
Sky and Telescope - January 2018 - SGA18EAL
Sky and Telescope - January 2018 - 94
Sky and Telescope - January 2018 - SGA18E
Sky and Telescope - January 2018 - SGA18EA
Sky and Telescope - January 2018 - SGA18RAL
Sky and Telescope - January 2018 - 98
Sky and Telescope - January 2018 - SGA18R
Sky and Telescope - January 2018 - SGA18RA
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