Sky & Telescope - August 2021 - 20

Milky Way Cloud-hop
ever, to get a quality view of IC 1283/84, you should use a
low-power eyepiece to provide the contrast necessary to bring
the bright nebulosity into view against the dark cloud below.
Slewing to Scutum
The best news about IC 1287 (Barnard also discovered bright
objects, this one in 1892) is that it sits just southwest of a
wonderful region, the Scutum Star Cloud. A rich-fi eld telescope
with a wide-angle eyepiece provides an enchanting view,
revealing the massive star cloud and surrounding dark nebulae:
B97, B100, B101, and B314. We're talking about an area of sky
that's about nine square degrees in size. You'll have to slowly
sweep your scope across the area multiple times, registering
your location between slews by noting markers such as specifi c
stars, star clusters, and even dark nebulae. For example, B100
Sagittarius
Object
B92
B93
NGC 6589
Type
Dark
Dark
Refl ection
NGC 6590/95 Refl ection
IC 1283/84
Emission/
Refl ection
Size/Sep
15′ × 9′
15′ × 2′
5′ × 3′
4′ × 3′
17′ × 15′
RA
Dec.
18h 15.6m -18° 14′
18h 16.9m -18° 04′
18h 16.9m -19° 47′
18h 17.1m
and B101 are 10′ north of 8th-magnitude star HD 170901 and
are 40′ southeast of 4th-magnitude Alpha (α) Scuti.
As you sweep southwest in the star cloud you'll turn up
B97. A Mira-type variable star inhabits this nebula: V441 Scuti,
which ranges in magnitude from 5.2 to 8.1. Continuing east
1° or so brings you to B314, which sculpts the other side of
the star cloud. Circling back south and west returns you to
IC 1287. Overall faintness and the presence of 5.7-magnitude
HD 170740, which illuminates the nebula, make for a challenging
fi nd. Slewing farther south to the border with Sagittarius,
we can take in the extensive dark nebula B312. It's not
hard to locate thanks to the rich star fi eld that fi lls the region.
Veering to Vulpecula
In order to visit our next targets in the Fox, we'll have to
Scutum
Object
IC 1287
B97
-19° 52′
18h 17.6m -19° 40′
B100
B101
B314
B312
Type
Dark
Dark
Dark
Dark
Dark
Size/Sep
Refl ection 20′ × 10′
50′ × 50′
16′ × 16′
13′ × 4′
35′ × 25′
100′ × 30′
RA
Dec.
18h 30.4m -10° 48′
18h 29.1m -09° 55′
18h 32.7m -09° 09′
18h 32.7m -08° 49′
18h 37.1m -09° 43′
18h 32.2m -15° 35′
NGC 6649
IC 1287
HD 171391
BLACK AS COAL B92 (right) and B93 (left) are inky blobs that blot
out background stars. The American astronomer E. E. Barnard
documented several hundred dark nebulae, and today some 370
objects carry the " B " designation.
DARK TENDRILS The Scutum Star Cloud provides a dramatic
backdrop for a fi ne collection of Barnard dark nebulae, which in
turn nicely frame the delicate refl ection nebula IC 1287.
20 AUGUST 2021 * SKY & TELESCOPE
KONSTANTIN VON POSCHINGER / CCDGUIDE.COM (2)

http://www.CCDGUIDE.COM

Sky & Telescope - August 2021

Table of Contents for the Digital Edition of Sky & Telescope - August 2021

Contents
Sky & Telescope - August 2021 - Cover1
Sky & Telescope - August 2021 - Cover2
Sky & Telescope - August 2021 - 1
Sky & Telescope - August 2021 - Contents
Sky & Telescope - August 2021 - 3
Sky & Telescope - August 2021 - 4
Sky & Telescope - August 2021 - 5
Sky & Telescope - August 2021 - 6
Sky & Telescope - August 2021 - 7
Sky & Telescope - August 2021 - 8
Sky & Telescope - August 2021 - 9
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Sky & Telescope - August 2021 - 11
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Sky & Telescope - August 2021 - Cover3
Sky & Telescope - August 2021 - Cover4
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