Sky & Telescope - October 2020 - 56

OCTOBER 2020 OBSERVING
Deep-Sky Wonders by Sue French

21h 20m

21h 00m

7025

20h 40m

γ

French 1

20h 20m

IC 4997

α

7006

ζ

δ
DELPHINUS

Splashing
Around
the Dolphin
T

he autumn sky plays host to a flood
of aquatic constellations that inundate the southeastern expanse of this
month's all-sky star chart. Starting in
the east and flowing toward the south,
you'll see Cetus, the Whale; Pisces,
the Fishes; Aquarius, the Water Bearer;
Piscis Austrinus, the Southern Fish;
Capricornus, the Sea Goat; and Delphinus, the Dolphin. The smallest of these
constellations, Delphinus most resembles its namesake - a dolphin leaping
playfully from the starry waters.
Let's first take to the water in far
southeastern Delphinus, where we'll
find the tight double star Σ2735 sitting
53′ west-northwest of the star 1 Equulei
in the neighboring constellation Equuleus, the Little Horse. The components
of Σ2735 are only 2″ apart, but they're
cleanly split through my 130-mm (5.1inch) refractor at 117×. The 6.5-magnitude primary nuzzles a 7.5-magnitude
companion a bit to the north of west.
To me, the brighter star appears deep
yellow and the secondary white.
Swimming 6.1° west-northwest, we
come to NGC 6934 (for more on globuTo celebrate 20 years of Sue French's
stellar contributions to Sky & Telescope, we will be sharing the best of
her columns in the coming months.
We have updated values to current
measurements when appropriate.

56

OCTOBER 2 02 0 * SK Y & TELESCOPE

β

17

η

θ
6956

δ

γ

7015

ι

Thompson 1
18

κ

ε
+10°
6928

6934

β

EQUULEUS
α
1

+5°

Σ2735
Star magnitudes
4 5 6 7 8

S NGC 6934 is the brightest globular cluster north of the celestial equator that's not in the Messier
catalog. It's a fine spectacle through medium to large telescopes, though you'll never see it as well
resolved as in this Hubble Space Telescope image.

ESA / HUBBLE / N ASA

Tiny Delphinus holds a
surprising variety of deep-sky
objects.

+15°



Sky & Telescope - October 2020

Table of Contents for the Digital Edition of Sky & Telescope - October 2020

Contents
Sky & Telescope - October 2020 - Cover1
Sky & Telescope - October 2020 - Cover2
Sky & Telescope - October 2020 - 1
Sky & Telescope - October 2020 - Contents
Sky & Telescope - October 2020 - 3
Sky & Telescope - October 2020 - 4
Sky & Telescope - October 2020 - 5
Sky & Telescope - October 2020 - 6
Sky & Telescope - October 2020 - 7
Sky & Telescope - October 2020 - 8
Sky & Telescope - October 2020 - 9
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Sky & Telescope - October 2020 - Cover3
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