Sky & Telescope - June 2021 - 43

Facin
SEXTANS
5°

binocular view

+60°

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ci
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6

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Alphard

19
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LOPA

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Treasures of the
Southern Seas
Facing West

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OÖTES

Binocular Highlight by Mathew Wedel

M67

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WHEN TO
USE THE MAP

Late April
Early May
Late May
Early June
Late June

2 a.m.*
1 a.m.*
Midnight*
11 p.m.*
Nightfall

*Daylight-saving time

T

his month we visit sprawling Hydra, the Water
Snake. Let's start our voyage with Alphard,
Alpha (α) Hydrae, the brightest star in the constellation. Alphard, about 23° south-southwest of Regulus
in Leo, is an easy find because it has so little competition: At 2nd magnitude, it's brighter by far than
any other star in its vicinity. In fact, the name Alphard
comes from the Arabic Al-Fard, meaning " the Solitary
One. " But as we shall see, Alphard has plenty of
company for alert binocular observers.
About 4½° to the west of Alphard you'll find 19 and
20 Hydrae. The pair make an easy binocular double,
with a separation of almost 1/3°. See if you can detect
any color difference between 19 Hydrae, a 5.6-magnitude B-type blue-white giant, and 20 Hydrae, a
5.5-magnitude G-type yellow-orange giant. There's
another attractive binocular double in the same field.
With a separation of 229″, 4.8-magnitude 27 Hydrae
forms a nice, wide pair with 7th-magnitude HD 80550.
Smack in the center of the field between 19 and
20 Hydrae and Alphard is the object that first caught
my attention when I was passing this way a couple
of years ago. Fifth-magnitude 24 Hydrae has an
arc of dimmer stars about half a degree to the west.
Together they make an asterism in the shape of a
scallop shell. That fits with the marine theme of the
constellation and with the more famous seashell at
the other end of Hydra: M83, the Seashell Galaxy.
Like the ocean, this expansive stretch of sky might
seem empty at first glance, but it has plenty to reward
the intrepid mariner. What other treasures can you
find in these dark depths?
„ MATT WEDEL enjoys fishing, he's just not very
good at it. But he never gets skunked when he dips a
line in the cosmic ocean.
sk yandtelescope.org * JUNE 2 021

43



http://www.skyandtelescope.org

Sky & Telescope - June 2021

Table of Contents for the Digital Edition of Sky & Telescope - June 2021

Contents
Sky & Telescope - June 2021 - Cover1
Sky & Telescope - June 2021 - Cover2
Sky & Telescope - June 2021 - 1
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