Sky and Telescope - June 2016 - 43

Facing

When
Late April 2 a.m.*
Early May 1 a.m.*
Late May Midnight*
Early June 11 p.m.*
Late June Nightfall
*Daylight-saving time.

3
+60°

OPAR

DALIS

I

+80°

E

α

β

llu
Po

x

L

Y

N

X
Polaris

URS
MINO

82

M

α

Regulus

Ju

pit

er

Denebola

α

β

C
BER OMA
ENIC
ES
γ

O

i no

G

OPHIUCHUS

ica

ar

v i ew

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6633

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Moo 15
June

I R

A lot of stargazers don't observe exclusively with
either binoculars or a telescope, but switch back and
forth as needed. There's a lot to be said for examining the same target with diﬀerent instruments.
I was reminded of this when I revisited NGC
6633, an open cluster in the eastern reaches of
Ophiuchus. When I was a newcomer to astronomical sketching, this cluster was one of my ﬁrst targets.
Only later did I learn its nickname: the Italy Cluster.
Some years ago, Michele Bortolotti and Guido
Rocca of Verona, Italy, pointed out that NGC 6633
was reminiscent of their home country's famous
"boot" shape. Because I'd used a reﬂector, my
sketch was inverted. When I turned the drawing
around, Italy's shape was not just obvious, it was
unavoidable. There's even a stellar Sicily anchored
on the 5th-magnitude foreground star HD 170200.
When I visited the area on a pre-dawn binocular
hunt, I was delighted to see the Italy shape of NGC
6633 was readily apparent in my 10×50 binoculars.
Maybe I should have anticipated that - with a maximum extent of nearly ½° and a magnitude of 4.6, the
cluster is big and bright enough to show considerable detail in binoculars. For a challenge, see how
many stars you can resolve. At a distance of 1,200
light-years, most of the cluster's 150-plus members
merge into a nebulous glow, leaving only a dozen or
two of the brightest blazing in the foreground.
Most guides include NGC 6633 in a band with
IC 4665 and IC 4756. But I have other homework for
you: pick out the stream of faint suns, about 1° wide,
which runs north from NGC 6633 before breaking
into several chains of stars, like branches from the
trunk of a tree, near the border with Hercules. ✦

R

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A Starry Shoe

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AU

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in

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Mathew Wedel
Binocular Highlight

°
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IC 4756

SW

σ

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-40°

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TAU
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12h

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in

-1
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SERPENS
CAUDA

1
2
3 Star
4 magnitudes

Sk yandTelescope.com June 2016

43

http://www.SkyandTelescope.com

Sky and Telescope - June 2016

Table of Contents for the Digital Edition of Sky and Telescope - June 2016

Contents
Sky and Telescope - June 2016 - Cover1
Sky and Telescope - June 2016 - Cover2
Sky and Telescope - June 2016 - 1
Sky and Telescope - June 2016 - Contents
Sky and Telescope - June 2016 - 3
Sky and Telescope - June 2016 - A
Sky and Telescope - June 2016 - B
Sky and Telescope - June 2016 - 4
Sky and Telescope - June 2016 - 5
Sky and Telescope - June 2016 - 6
Sky and Telescope - June 2016 - 7
Sky and Telescope - June 2016 - 8
Sky and Telescope - June 2016 - 9
Sky and Telescope - June 2016 - 10
Sky and Telescope - June 2016 - 11
Sky and Telescope - June 2016 - 12
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Sky and Telescope - June 2016 - 15
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Sky and Telescope - June 2016 - Cover3
Sky and Telescope - June 2016 - Cover4
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