Sky & Telescope - July 2019 - 58

JULY 2019 OBSERVING
Going Deep

p Left: The Pipe Nebula, or Barnard 59, is a perfect example of how William Herschel and others mistook dark nebulae for "holes" in the sky. The stars

8th-magnitude star HD 147889. The
nebula, described by Barnard as a 20′
(arcminute) brightening around and
north of the star, was discovered just in
time to be included in the Second Index
Catalogue (published in 1908). Turn
back north, and you'll cross over a dark
17h 00m

17h 20m

16h 20m

16h 40m

6309

ν

M107

SERPENS
CAUDA

OPHIUCHUS

η

-15°

ξ

φ
M9
6342

-20°

ψ

ξ

PK 359+15.1

B63

B72 B68
6369
6325
44

θ

6287

6235

ο

ρ
IC 4603

M19

α

43 B244

58

B256
B243

J U LY 2 0 1 9 * S K Y & T E L E S C O P E

τ
M62

ο
σ

Antares

B59

M80
HD 147889

SCORPIUS

B78

-30°

IC 4604

B42
B44

B43

ω

B45
B51

51

3
4
5
6
7
8

χ

B64

B259

-25°

Star magnitudes

17h 40m

channel of Barnard 42 to ﬁnd the 5thmagnitude multiple star Rho Ophiuchi
surrounded by IC 4604, a bright nebula
somewhat larger than IC 4603.
Leave Rho Ophiuchi by moving 3°
north to see Barnard 43, another large
and well-deﬁned dark nebula. However,

M4

ν

after the Rho Ophiuchi ﬁeld, the real
treat is to start about 1° southeast of
IC 4603 and slew east. Follow the truly
dark path of Barnard 44 for some 6°
or so until you arrive at Barnard 51,
which marks a somewhat sharp end to
the extensive dark lane. Along the way
you'll also ﬁnd the globular clusters
NGC 6235, NGC 6287, and NGC 6325
(you may spot several more bordering
on either side of the dark lane).
Just 2° north of Barnard 44 you'll
ﬁnd Barnard 45. This nebula looks to
me to be about 2° long, with the very
faint planetary nebula PK 359+15.1
(Abell 40) at its eastern end (and the
9th-magnitude star HD 151451 some
10′ northwest of the planetary).
Back at B51 you can proceed by
slewing 3° east-northeast to get to
the curved dark nebula Barnard 63.
Continuing a little more than 3° north
brings us to comet-shaped Barnard 64.
The globular cluster M9 is on the
nebula's eastern side. Turning ½°
southeast brings you to the dark nebula
Barnard 259, with the globular cluster
NGC 6342 on its southwestern edge. All
these associations between globular star
clusters and dark nebulae suggest that
we should easily forgive the scientists of
old for having made a mistaken connection between the two.

BA R N A RD 59: ESO; LIT TLE G HOST NEBUL A: N ASA / ESA /
THE HUBBLE HERITAG E TE A M / AUR A

superimposed on the inky blackness of the nebula are foreground stars. No starlight from background objects makes it through the dark cloud. Right:
NGC 6369 is often dubbed the "Little Ghost Nebula" - can you make out the ghostly ring of stellar matter blown off the dying star in your scope?

Sky & Telescope - July 2019

Table of Contents for the Digital Edition of Sky & Telescope - July 2019

Contents
Sky & Telescope - July 2019 - Cover1
Sky & Telescope - July 2019 - Cover2
Sky & Telescope - July 2019 - 1
Sky & Telescope - July 2019 - Contents
Sky & Telescope - July 2019 - 3
Sky & Telescope - July 2019 - 4
Sky & Telescope - July 2019 - 5
Sky & Telescope - July 2019 - 6
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