Sky and Telescope - July 2018 - 41

OBSERVING
July 2018
1 DAWN: Look toward the
southwest to see the waning
gibbous Moon and rusty Mars,
some 6°° apart, slowly disappear
from view as the sky brightens.
DUSK: Spot Mercury low on the
western horizon shortly after
sunset, where you will ﬁnd the
tiny world over the next 17 days.
Bring binoculars.

6 EARTH is at aphelion,
farthest from the Sun for 2018,
at a distance of 152,095,566
kilometers.

9 EARLY EVENING: Venus
accompanies Regulus at a
separation of less than 1° as Leo,
the Lion, sinks in the west.

10 DAWN: The thin sliver of
the waning crescent Moon is
in the Hyades, a mere ½° from
Aldebaran, as they rise together
in the east; an occultation of the
red giant is visible in parts of
Canada.
10-11 NIGHT: Jupiter arrives
at its stationary point - look
for it 2° right of the double star
Alpha (α) Librae; henceforth, the
giant planet slowly starts moving
eastward against the backdrop
of stars.
11-12 NIGHT: Mercury achieves
a greatest eastern elongation
of 26°; it then fades from view
until re-emerging at dawn in late
August.
15 DUSK: The waxing crescent
Moon and Venus, less than 2°
apart, trail Regulus by about 5°
as they descend in the west.

20 NIGHT: The waxing gibbous
Moon, giant Jupiter, and Alpha
Librae form a compact triangle
in the southwest.
24 NIGHT: The fat waxing
gibbous Moon visits Saturn in
Sagittarius, where the ringed
planet has lingered for the past
few months.
26-27 ALL NIGHT: Mars arrives
at opposition. Viewers in Europe,
Africa, and Asia are well placed
to witness an eclipsed Moon
pass some 6° above the planet;
see page 50.
30-31 ALL NIGHT: Mars comes
closer to Earth than it has
since 2003. Look in southwest
Capricornus to see the Red
Planet blazing at magnitude -2.8
and ﬂaunting a disk some
24.3″ wide.

Gullies on Mars are commonly found at midlatitudes, especially in the southern highlands.
Carbon dioxide is thought to play a key role in
their formation. Missions such as NASA's HiRISE,
from which this image was taken, greatly help in
our understanding of these features.
NASA / JPL / UNIVERSITY OF ARIZONA

s k y a n d t e l e s c o p e . c o m * J U LY 2 0 1 8

41

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Sky and Telescope - July 2018

Table of Contents for the Digital Edition of Sky and Telescope - July 2018

Contents
Sky and Telescope - July 2018 - Cover1
Sky and Telescope - July 2018 - Cover2
Sky and Telescope - July 2018 - 1
Sky and Telescope - July 2018 - Contents
Sky and Telescope - July 2018 - 3
Sky and Telescope - July 2018 - 4
Sky and Telescope - July 2018 - 5
Sky and Telescope - July 2018 - 6
Sky and Telescope - July 2018 - 7
Sky and Telescope - July 2018 - 8
Sky and Telescope - July 2018 - 9
Sky and Telescope - July 2018 - 10
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Sky and Telescope - July 2018 - 40
Sky and Telescope - July 2018 - 41
Sky and Telescope - July 2018 - 42
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