Sky & Telescope - July 2023 - 46

JULY 2023 OBSERVING
Sun, Moon & Planets by Gary Seronik
To find out what's
visible in the sky from
your location, go to
skyandtelescope.org.
Plenty of Action at Dusk
Mercury, Venus, Mars, and the Moon meet in the evening sky.
SATURDAY, JULY 1
At dusk this evening, have a look toward
the west to see a pair of planets that
have wildly different brightnesses but
are at similar points in their journeys
and share a similar story. The planets in
question are Venus and Mars. Both are
losing ground to encroaching twilight as
their respective apparitions wind down
and they drift toward conjunctions with
the Sun. In the case of the Evening Star,
that occurs on August 13th, while the
Red Planet holds off until November
18th. However, Mars will become essentially
invisible to the naked eye much
sooner than that - in the latter part
of August. Tonight, the two planets are
separated by just 3½°; however, they're
worlds apart in brightness - Venus is a
-4.7-magnitude beacon while Mars is a
1.7-magnitude ember.
SUNDAY, JULY 9
Tonight and tomorrow Mars will be
parked very close to Regulus, the
brightest star in Leo, the Lion. This is
the first of two close planetary visits the
star receives in July. This evening Mars
is around ¾° from Regulus, though the
gap between them is very slightly less on
the evening of the 10th. The two objects
are also closely matched in brightness,
with the planet at magnitude 1.7 and
the star shining at 1.4. That's not a huge
span - can you perceive it? What makes
the comparison slightly tricky is the
contrasts in color - Mars is a peachy
orange, while Regulus a cool bluishwhite.
Indeed, the view might remind
you of the archetypal color-contrasting
double star Albireo, in Cygnus (see page
54). The difference is that with Albireo,
the orange component is six times
brighter than the blue one.
THURSDAY, JULY 13
As busy as things are at dusk, the morning
sky has its share of attractions, too.
The month's finest dawn event is a nice
pairing of the waning crescent Moon
and the Pleiades, in Taurus. With less
These scenes are drawn for near the middle of North America (latitude 40° north, longitude 90° west). European observers should move each
Moon symbol a quarter of the way toward the one for the previous date; in the Far East, move the Moon halfway. The blue 10° scale bar is about the
width of your fist at arm's length. For clarity, the Moon is shown three times its actual apparent size.
Dusk, July 10
45 minutes after sunset
10°
LEO
Less than
1° apart
Mars
Regulus
Venus
Regulus
Venus
Aldebaran
Dawn, July 12 - 13
1 hour before sunrise
Moon
July 12
Pleiades
Moon
July 13
TAURUS
Jupiter
Dusk, July 18 - 20
30 minutes after sunset
LEO
Moon
July 20
Mars
Moon
July 19
Mercury
Moon
July 18
Looking West
Looking East
46
JULY 2023 * SKY & TELESCOPE
Looking West

http://www.skyandtelescope.org

Sky & Telescope - July 2023

Table of Contents for the Digital Edition of Sky & Telescope - July 2023

Contents
Sky & Telescope - July 2023 - Cover1
Sky & Telescope - July 2023 - Cover2
Sky & Telescope - July 2023 - 1
Sky & Telescope - July 2023 - Contents
Sky & Telescope - July 2023 - 3
Sky & Telescope - July 2023 - 4
Sky & Telescope - July 2023 - 5
Sky & Telescope - July 2023 - 6
Sky & Telescope - July 2023 - 7
Sky & Telescope - July 2023 - 8
Sky & Telescope - July 2023 - 9
Sky & Telescope - July 2023 - 10
Sky & Telescope - July 2023 - 11
Sky & Telescope - July 2023 - 12
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Sky & Telescope - July 2023 - 46
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