Sky & Telescope - August 2019 - 55
SK E TCH: SUE FRENCH; E AG LE NEBUL A: T. A . RECTOR (NR AO / AUI / NSF A ND NOAO /
AUR A / NSF ) / B. A . WOLPA (NOAO / AUR A / NSF )
NGC 6631 is a little misty patch off its
southeastern side. The open cluster is
elongated southeast-northwest with an
11th-magnitude star at the northwestern end. At 95× NGC 6631 shows 20
faint to very faint stars in a 5′ glow; at
154× it's crowded with minute stars.
Next we'll trek northwest to a trio of
globular clusters. The first of the group
p Left: The author's sketch of the Eagle Nebula demonstrates that many of the features in the
image at right are visible through a 5-inch telescope. Right: Like most Hubble Space Telescope
images, this photograph of the Eagle Nebula (taken through a small professional ground-based
telescope) uses a false-color palette. Emissions from hydrogen are shown as green, oxygen as
red, and sulfur as blue. The Pillars of Creation are in the center.
18h 30m
18h 20m
18h 10m
IC 1276
Star magnitudes
The Eagle dwells in a realm of the sky
rife with nebulae and star clusters. Its
unsung neighbor Trumpler 32 resides
just 38′ northwest and shares the field
with M16 through my 6-inch reflector
at 38×. This nice little cluster is a hazy
cobweb with a corona of faint, dewdrop
stars glimmering on the sable walls of
night. At 154× about 20 stars overspread
11′ of sky. A prominent knot of several
stars dominates the southern part of
the cluster. At high magnification, my
10-inch reflector reveals a wealth of
suns, many so faint that they blink in
and out of view.
On the opposite side of the Eagle,
we find the emission nebula Sharpless
2-48. Look 1° southeast of M16 for a
7th-magnitude star, the brightest in the
area. Centered 12′ south-southeast of
that star is a 6′ trapezoid of stars 9th
magnitude and fainter. Through my
6-inch reflector at 95×, the brightest
region of this patchy nebula surrounds
the western side of the trapezoid and
spreads 4′ westward. Dimmer nebulosity extends to the trapezoid's eastern
side and becomes more attenuated as it
reaches southeast.
The large, faint nebula Sharpless
2-54 lies 1¾° north of the Eagle. Under
a dark sky, binoculars will give you a
nice view if you place the Eagle in the
southern part of the field. I perused
this emission nebula through my 15×45
image-stabilized binoculars while in the
northern Adirondack Mountains, one
of the darkest areas in my home state of
New York. They revealed a 1° × 2° starrich haze that's wide in the west and
tapers toward the east-northeast. Much
of the haze I see may well be the light
of unresolved stars. This section of the
Milky Way stands out as a somewhat
isolated star cloud bounded on the west
by the dusky clouds of the Great Rift
and lined with smaller dark nebulae on
the east. Nonetheless, it's a pretty sight.
Barnard 95 is the most obvious
dark nebula on the eastern end of Sh
2-54. Through my 6-inch scope at 38×,
it seems to grow blacker toward the
center. Barnard 95's inkiest area spans
about 10′, while the entire nebula is perhaps twice that size and quite irregular.
3
4
5
6
7
8
9
18h 00m
6539
o
c
-8°
6517
OPH
-10°
SERPENS CAUDA
B97
i
SCUTUM
B95
6604
6631
-12°
Sh 2-54
Tr 32
Eagle Nebula
M16
a
Sh2-46
-14°
Sh 2-48
sk yandtele scope.com * AUGU S T 2 019
55
http://www.skyandtelescope.com
Sky & Telescope - August 2019
Table of Contents for the Digital Edition of Sky & Telescope - August 2019
Contents
Sky & Telescope - August 2019 - Cover1
Sky & Telescope - August 2019 - Cover2
Sky & Telescope - August 2019 - 1
Sky & Telescope - August 2019 - Contents
Sky & Telescope - August 2019 - 3
Sky & Telescope - August 2019 - 4
Sky & Telescope - August 2019 - 5
Sky & Telescope - August 2019 - 6
Sky & Telescope - August 2019 - 7
Sky & Telescope - August 2019 - 8
Sky & Telescope - August 2019 - 9
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