Sky & Telescope - September 2021 - 36

Summer Observing
NGC 7008
21h 40m
π1
7086
6826
51
M39
ω2
7082
71
ρ
7062
7039
68
7000
ξ
57
63
60
North
America
Nebula
55
α
IC 5070
Pelican
Nebula
56
14
LYRA
ν
σ
61
19
τ
70
7063
υ
2
3
4
5
6
7
8
ζ
6995
ε
χ
6992
39
Veil
Nebula
52
φ
6960
VULPECULA
32
6940
31
the background star field, but collectively they help define
their respective arcs. I don't know if the arcs have ever been
named, but they make me think of a sloppily stacked hamburger
bun with a patty of dark sky between them.
For an even richer view, turn to Sadr at the very center of
the constellation. Sadr is derived from the Arabic word for
" chest, " and by coincidence the star at the heart of the Swan
is surrounded by a heart-shaped asterism about 2° across.
The heart is formed by a ring of 6th-magnitude stars, which
36 SEPTEMBER 2021 * SKY & TELESCOPE
23
41
21
15
3
bends inward at its northwest margin. The binocular field is
enriched by a trio of open clusters. NGC 6910 and Collinder
419 lie on the border of the heart asterism, to the north and
northwest of Sadr, respectively.
Just south of the heart you'll find 6.6-magnitude M29
- the easiest of the three clusters to recognize as a distinct
object. By contrast, you'll need patience and determination
to pick out NGC 6910 and Collinder 419 from the brighter,
foreground stars. Finally, if you're observing under exception6834
9
Albireo
β
+30°
2
CYGNUS
λ
X
47
35
17
M29
Berk
86
34
IC 4996
29
28
6883
27
Biur 2
6871
η
8
+35°
Basel 6
25
15
4
6888
22
θ
Northern
Coalsack
6910
Sadr
γ
IC 1318
Cr 419
6819
+40°
η
6866
Deneb
δ
ω1
59
ο1
ο2
30
6811
+45°
26
16
θ
21h 20m
21h 00m
20h 40m
20h 20m
20h 00m
20
ψ
ι
+50°
DRA
19h 40m
19h 20m
κ
19h 00m
Star magnitudes

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
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Sky & Telescope - September 2021 - Cover3
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