Sky & Telescope - September 2021 - 37
ally dark skies, you may detect IC 1318 as a
vast field of faint nebulosity enclosing Sadr
like the petals of a flower.
Winging It
We'll find more nebulae and clusters in the
wings of the Swan. But first, scan 8° due
west of Sadr, and look for a little, sideways Y-shaped asterism
comprising three 7th-magnitude stars and one of 6th
magnitude. Spilling out of the western end of the Y like fruit
from a cornucopia is the open cluster NGC 6819. It doesn't
show much detail at binocular magnifications, but that's
mainly because it's 7,700 light-years away. That's quite distant
for such a bright cluster and means that everything else in
the surrounding binocular field is much closer. Cygnus is full
of rich, deep views like this, with multiple objects lying at different
distances along the same line of sight. Each vista offers
tantalizing insights into the local structure of our galaxy.
The binoculars-and-telescope advice I offered earlier goes
double for the next object on our tour, NGC 6826. Better
known as the Blinking Planetary, look for the tiny nebula ½°
due east of 6th-magnitude 16 Cygni, on the trailing edge of
the western wing. The object is so named because in teleBEAUTIFUL
BETA Our binocular tour begins
with the lovely double star Albireo, Beta (β) Cygni,
located at the foot of the Northern Cross asterism.
The stellar duo are a difficult split in binoculars but
easy in small telescopes.
scopes the delicate oval of light blinks out
when you look at it directly, leaving only
its 10.6-magnitude central star in view. It's a curious effect
that nicely demonstrates the difference between direct and
averted vision. At binocular magnifications, however, the trick
is recognizing the tiny nebula at all. As much as I prefer freehanding
my binoculars, putting them on a mount or resting
them on a convenient fence post really helps me pick out
NGC 6826 as a slightly fuzzy, 8.8-magnitude " star. "
Now, let's glide 6° southeast to the naked-eye double
formed by Omicron1 and Omicron2 Cygni. Omicron1 Cygni
(the more southern of the pair) holds a nice surprise for
binocular observers - along with 30 Cygni and HD 192579, it
forms an optical triple star. The component suns aren't gravitationally
bound to one another, they simply appear close in
the sky as seen from our earthly perspective. Omicron1 is a
3.8-magnitude orange giant, 30 Cygni is a 4.8-magnitude
white giant, and HD 192579 is a 7th-magnitude blue-white
RICH FIELD The Cygnus Milky Way is replete with subtle splendor, including open cluster M29, positioned left of center in this image. The star at
lower right is the variable P Cygni, while the top of the frame glows pinkish-red with the faint haze of IC 1318.
sk yand tele scope .o r g * SEPTEMBER 2021 37
ALBIREO: GARY SERONIK; M29 FIELD: ALAN DYER
https://skyandtelescope.org/
Sky & Telescope - September 2021
Table of Contents for the Digital Edition of Sky & Telescope - September 2021
Contents
Sky & Telescope - September 2021 - Cover1
Sky & Telescope - September 2021 - Cover2
Sky & Telescope - September 2021 - 1
Sky & Telescope - September 2021 - Contents
Sky & Telescope - September 2021 - 3
Sky & Telescope - September 2021 - 4
Sky & Telescope - September 2021 - 5
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