Sky & Telescope - July 2020 - 63

16h 00 m

15h 30 m

ζ

15h 00 m

14h 30 m

BOÖTES
δ
λ

+10°

SERPENS
α CAPUT

VIRGO

ε
M5

109

5

0°
Baade's
Window

Star magnitudes

μ
2
3
4
5
6
7

μ
LIBRA

β

-10°

p PEERING TOWARD THE CENTER OF THE MILKY WAY
Baade's Window offers a peek into the core of our galaxy, with a
couple of globular clusters thrown in for spice. FOV=20°
All sketches have north upwards.

M5 is actually marginally brighter than M13, the great
Hercules cluster. The Serpens globular has a tight core that's
so packed with stars it's difficult to resolve, but the outer
reaches break into thousands of stars. The cluster lies around
24,500 light-years away and spans about 165 light-years,
making it one of the largest known.
The bright star near M5, 5 Serpentis, is a nice double. Its
5th- and 10th-magnitude components are separated by 11″.
The faintness of the companion makes this a bit of a challenge, but I'm able to split it easily in an 8-inch scope, and I
bet it's doable at half that aperture.
Compare M5 to M22, just 2.5° northeast of Kaus Borealis,
the top star of the Teapot in Sagittarius. M22 is even brighter
and bigger than M5, but that's due to its relative proximity
rather than its intrinsic size. At a distance of 10,000 lightyears, it's less than half as far away as M5, which makes
resolving its individual stars a little easier. The cluster's looser
core also helps with that.

Dive into Nebulae
I could fill an entire article with globular clusters, but there's so much more to see! Let's
finally take that stroll up the steam rising
out of the Teapot, starting with M8, the
Lagoon Nebula. If the Orion Nebula is the
luminary of winter, the Lagoon is its summer counterpart. It's easy to spot by naked
eye and is glorious in binoculars. With the
Lagoon you get a twofer: There's a large,
bright emission nebula and an associated
open cluster embedded within it. A nebula filter greatly increases the extent of the glowing
gas, at the expense of the cluster. The nebula is

p NGC 6520 AND BARNARD 86 An open cluster
nestles with an ink spot in
space. FOV=30′
t M6 AND M7 Both of these
open clusters, the Butterfly
and Ptolemy's, are visible to
the naked eye under dark
skies. FOV=6° 20′
s k y a n d t e l e s c o p e . o r g * J U LY 2 0 2 0

63



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Sky & Telescope - July 2020

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