Sky and Telescope - June 2017 - 66
Dark Nebulae
-33°
SL 12
r
j
Star magnitudes
Be 148
5
s2
6
B228
7
8
9
10
-35°
SL 13
16h 00m
-34°
s1
LUPUS
15h 50m
15h 55m
15h 40m
16h 00m
ξ
15h 45m
-36°
15h 40m
15h 50m
15h 40m
χ
SL 12
15h 35m
15h 30m
15h 20m
-34°
ψ1
B228
ψ2
SL 13
-36°
LUPUS
φ1
θ
φ2
SL 11
η
5986
-38°
peculiar clouds can be observed year
round with binoculars, telescopes, or
occasionally, the naked eye (for instance,
the Great Rift stretches more than 120°
from Deneb to Alpha Centauri, offering one of the largest possible naked-eye
targets). To really dig in to dark nebulae
you'll need binoculars or a telescope
with a very wide field of view: a specially designed rich-field telescope or a
scope equipped with one of the newer
wide-field eyepieces. Increasing aperture increases the size of the nebula in
your eyepiece and improves the contrast
between the nebula and skyglow. But
these "improvements" may not be much
help, as some dark nebulae are so broad
that they'll stretch beyond your field of
view. For nebulae longer than 1°, you'll
do better with a small aperture f/3 or f/4
scope with an 80° or 100° eyepiece that
provides a wider field of view - the right
combination can yield a field of view as
wide as 3°. Low-power, high-aperture
binoculars are also a good option for
hunting these dust clouds.
You'll also need a dark sky and good
transparency, two conditions that are
sometimes difficult to obtain when
observing objects close to the horizon.
Move away from light pollution (star
party, anyone?), meticulously protect
your dark-adapted vision, and stay up
until midnight when Lupus leaps to its
highest between May and July.
A Different Catalog
Be 149
υ
-40°
δ
Star magnitudes
γ
3
SL 7
4
-42°
ω
5
6
7
8
-44°
SL 8
ε
δ
66
J U N E 2 0 1 7 * SK Y & TELESCOPE
Most dark nebulae favored by amateur
astronomers come from the Barnard
catalog, compiled by E. E. Barnard based
on photographic plates taken at Lick
Observatory and Mount Wilson Observatory, or the Lynds catalog, compiled
by Beverly T. Lynds from images taken
during the National Geographic Society-
Palomar Observatory Sky Survey (POSS).
A few lesser-known catalogs provide coverage of dark targets at more southerly
declinations. For example, the Sandqvist
Lindroos (SL) catalog, compiled by Aage
Sandqvist and K. P. Lindroos (Stockholm
Observatory) as part of their study of
formaldehyde in dark dust clouds, lists
42 absorption nebulae detected in the
Whiteoak fields. (The Whiteoak fields
Sky and Telescope - June 2017
Table of Contents for the Digital Edition of Sky and Telescope - June 2017
Contents
Sky and Telescope - June 2017 - Cover1
Sky and Telescope - June 2017 - Cover2
Sky and Telescope - June 2017 - 1
Sky and Telescope - June 2017 - Contents
Sky and Telescope - June 2017 - 3
Sky and Telescope - June 2017 - 4
Sky and Telescope - June 2017 - 5
Sky and Telescope - June 2017 - 6
Sky and Telescope - June 2017 - 7
Sky and Telescope - June 2017 - 8
Sky and Telescope - June 2017 - 9
Sky and Telescope - June 2017 - 10
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Sky and Telescope - June 2017 - 13
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Sky and Telescope - June 2017 - Cover4
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