Sky and Telescope - September 2018 - 43

e

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Binocular Highlight by Mathew Wedel

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B111

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WHEN TO
USE THE MAP

Late July
Early Aug
Late Aug
Early Sept
Late Sept

Midnight*
11 p.m.*
10 p.m.*
9 p.m.*
Nightfall

*Daylight-saving time

A

drum that I happily bang in my public talks is
that if you want to understand the large-scale
structure of our galaxy, binoculars are often more
useful than a telescope. The vast dust lanes and star
clouds that spangle the Milky Way from Cygnus to
Scorpius - and beyond, if you can get far enough
south - are mostly too big to appreciate in all but
the richest-field telescopes.
The Scutum Star Cloud is a prime example.
Neatly framed between Beta (β) Scuti and Epsilon
(ε) Scuti, the densest part of the cloud is about 3.5°
across. A lot of small scopes will show that much, but
to fully appreciate the Scutum Star Cloud you need
to take in more sky. To the southeast, the star cloud
fades gently into the rich star fields of the Milky Way.
But to the north and west, the cloud cuts off abruptly,
as if it had suddenly run out of stars. The sharp cutoff
is particularly pronounced on the northeast edge of
the cloud, where the sickle-shaped dark nebula B111
lies immediately north of M11, the Wild Duck Cluster.
Dark nebulae exemplify the mind-bending reality of the inner Milky Way: The darkness is a thing,
clouds of dust in the foreground of our view, and the
bright blaze of the galaxy mostly represents the more
distant swarms of stars that populate the inner spiral
arms and galactic bulge. We see the Scutum Star
Cloud not because it's intruding into our view against
a dark background, but because chance has pulled
back the curtain of dust to give us a glimpse of the
glories beyond. It's a vertiginous view, but falling in
can't hurt you, so I say take the plunge.
¢ Just once, MATT WEDEL would like to observe
the Milky Way with no dust in the way. And as long as
he's dreaming, he'd like a pony.
sk yandtelescope.com * S E P TE M B E R 2 018

43


http://www.skyandtelescope.com

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

Contents
Sky and Telescope - September 2018 - Cover1
Sky and Telescope - September 2018 - Cover2
Sky and Telescope - September 2018 - 1
Sky and Telescope - September 2018 - Contents
Sky and Telescope - September 2018 - 3
Sky and Telescope - September 2018 - 4
Sky and Telescope - September 2018 - 5
Sky and Telescope - September 2018 - 6
Sky and Telescope - September 2018 - 7
Sky and Telescope - September 2018 - 8
Sky and Telescope - September 2018 - 9
Sky and Telescope - September 2018 - 10
Sky and Telescope - September 2018 - 11
Sky and Telescope - September 2018 - 12
Sky and Telescope - September 2018 - 13
Sky and Telescope - September 2018 - 14
Sky and Telescope - September 2018 - 15
Sky and Telescope - September 2018 - 16
Sky and Telescope - September 2018 - 17
Sky and Telescope - September 2018 - 18
Sky and Telescope - September 2018 - 19
Sky and Telescope - September 2018 - 20
Sky and Telescope - September 2018 - 21
Sky and Telescope - September 2018 - 22
Sky and Telescope - September 2018 - 23
Sky and Telescope - September 2018 - 24
Sky and Telescope - September 2018 - 25
Sky and Telescope - September 2018 - 26
Sky and Telescope - September 2018 - 27
Sky and Telescope - September 2018 - 28
Sky and Telescope - September 2018 - 29
Sky and Telescope - September 2018 - 30
Sky and Telescope - September 2018 - 31
Sky and Telescope - September 2018 - 32
Sky and Telescope - September 2018 - 33
Sky and Telescope - September 2018 - 34
Sky and Telescope - September 2018 - 35
Sky and Telescope - September 2018 - 36
Sky and Telescope - September 2018 - 37
Sky and Telescope - September 2018 - 38
Sky and Telescope - September 2018 - 39
Sky and Telescope - September 2018 - 40
Sky and Telescope - September 2018 - 41
Sky and Telescope - September 2018 - 42
Sky and Telescope - September 2018 - 43
Sky and Telescope - September 2018 - 44
Sky and Telescope - September 2018 - 45
Sky and Telescope - September 2018 - 46
Sky and Telescope - September 2018 - 47
Sky and Telescope - September 2018 - 48
Sky and Telescope - September 2018 - 49
Sky and Telescope - September 2018 - 50
Sky and Telescope - September 2018 - 51
Sky and Telescope - September 2018 - 52
Sky and Telescope - September 2018 - 53
Sky and Telescope - September 2018 - 54
Sky and Telescope - September 2018 - 55
Sky and Telescope - September 2018 - 56
Sky and Telescope - September 2018 - 57
Sky and Telescope - September 2018 - 58
Sky and Telescope - September 2018 - 59
Sky and Telescope - September 2018 - 60
Sky and Telescope - September 2018 - 61
Sky and Telescope - September 2018 - 62
Sky and Telescope - September 2018 - 63
Sky and Telescope - September 2018 - 64
Sky and Telescope - September 2018 - 65
Sky and Telescope - September 2018 - 66
Sky and Telescope - September 2018 - 67
Sky and Telescope - September 2018 - 68
Sky and Telescope - September 2018 - 69
Sky and Telescope - September 2018 - 70
Sky and Telescope - September 2018 - 71
Sky and Telescope - September 2018 - 72
Sky and Telescope - September 2018 - 73
Sky and Telescope - September 2018 - 74
Sky and Telescope - September 2018 - 75
Sky and Telescope - September 2018 - 76
Sky and Telescope - September 2018 - 77
Sky and Telescope - September 2018 - 78
Sky and Telescope - September 2018 - 79
Sky and Telescope - September 2018 - 80
Sky and Telescope - September 2018 - 81
Sky and Telescope - September 2018 - 82
Sky and Telescope - September 2018 - 83
Sky and Telescope - September 2018 - 84
Sky and Telescope - September 2018 - Cover3
Sky and Telescope - September 2018 - Cover4
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