Sky & Telescope - August 2022 - 49
and Hyperion (14.3).
With a diameter of 5,150 kilometers,
Titan is slightly larger than the planet
Mercury and big enough to show a disk
(0.8″ wide) at opposition. It's also one
of the few moons to show a distinctive
color - an unmistakable sunset-orange.
Hyperion, the faintest of the eight,
is actually easier to see than brighter
Mimas because it orbits far from the
planet's glare.
Iapetus has a split personality, with
bright and dark hemispheres. During
the eastern half of its 79.3-day orbit,
the moon fades to 12th magnitude
as we view its coal-dark side. West of
the planet, it presents its reflective,
icy face and shines nearly two magnitudes
brighter. Iapetus reaches greatest
western elongation around August 8th,
making the first half of the month an
ideal time to catch it.
To keep track of the five brightest
moons, use the interactive Saturn's
Moons app, found on the Tools page at
skyandtelescope.org.
Bright Vesta and a Double
Shadow Transit at Jupiter
VESTA, THE SECOND LARGEST
main belt asteroid, comes to
opposition on August 23rd, when
it brightens to magnitude 6.0.
For much of the month, the
525-kilometer-wide object will be
an easy binocular target as it treks
westward across Aquarius. On
the nights of August 14-16, Vesta
passes 1.7° north of the large and
ghostly Helix Nebula (NGC 7293).
If you're out tracking Vesta a
week before its opposition, make
a note to look in on Jupiter on the
night of August 15-16 to see the
double shadow transit of Io and
Ganymede. As the table on page
51 lists, Io's shadow enters the
planet's disk on August 16th at 3:24
UT (11:24 EDT, August 15) and is
joined by Ganymede's shadow a
few minutes later at 3:59 UT. The
two inky dots will drift across the
planet's disk from 3:59−5:38 UT
(11:59 p.m. to 1:38 a.m. EDT). Jupiter
will be well placed for viewing
across the eastern two-thirds of the
Americas during the transits.
Because the black Jovian moon
shadows contrast strongly with
the planet's cloudtops, they can be
picked up with a surprisingly modest
telescope. The key to observing
shadow transits is moderate magnification
(in the range of 100×) and
steady seeing conditions.
Vesta plies star-poor southern Aquarius
this month and comes to opposition on
August 23rd, just a few days after Saturn.
Observers can hone their naked-eye skills
by attempting to find the 6.0-magnitude
asteroid without optical aid. (Vesta's position
is plotted for 0h UT.)
τ
9
13
17
δ
21
25
29
AQUARIUS
Aug 2
6
10
14
ε
18
-20°
22
2
3
4
5
6
7
8
9
22h 50m
22h 40m
7293
Helix Nebula
26
30
Sept
3
7
11
15
19
22h 30m
22h 20m
22h 10m
22h 00m
23 27 Oct 1
21h 50m
M30
21h 40m -24°
sk yand tele scope .o r g * AUGUST 2022 49
-22°
-18°
δ
γ
CAPRICORNUS
-16°
July
1
ι
5
-14°
P a t h o f
V e s t a
Star magnitudes
http://www.skyandtelescope.org
http://www.skyandtelescope.com
Sky & Telescope - August 2022
Table of Contents for the Digital Edition of Sky & Telescope - August 2022
Contents
Sky & Telescope - August 2022 - Cover1
Sky & Telescope - August 2022 - Cover2
Sky & Telescope - August 2022 - 1
Sky & Telescope - August 2022 - Contents
Sky & Telescope - August 2022 - 3
Sky & Telescope - August 2022 - 4
Sky & Telescope - August 2022 - 5
Sky & Telescope - August 2022 - 6
Sky & Telescope - August 2022 - 7
Sky & Telescope - August 2022 - 8
Sky & Telescope - August 2022 - 9
Sky & Telescope - August 2022 - 10
Sky & Telescope - August 2022 - 11
Sky & Telescope - August 2022 - 12
Sky & Telescope - August 2022 - 13
Sky & Telescope - August 2022 - 14
Sky & Telescope - August 2022 - 15
Sky & Telescope - August 2022 - 16
Sky & Telescope - August 2022 - 17
Sky & Telescope - August 2022 - 18
Sky & Telescope - August 2022 - 19
Sky & Telescope - August 2022 - 20
Sky & Telescope - August 2022 - 21
Sky & Telescope - August 2022 - 22
Sky & Telescope - August 2022 - 23
Sky & Telescope - August 2022 - 24
Sky & Telescope - August 2022 - 25
Sky & Telescope - August 2022 - 26
Sky & Telescope - August 2022 - 27
Sky & Telescope - August 2022 - 28
Sky & Telescope - August 2022 - 29
Sky & Telescope - August 2022 - 30
Sky & Telescope - August 2022 - 31
Sky & Telescope - August 2022 - 32
Sky & Telescope - August 2022 - 33
Sky & Telescope - August 2022 - 34
Sky & Telescope - August 2022 - 35
Sky & Telescope - August 2022 - 36
Sky & Telescope - August 2022 - 37
Sky & Telescope - August 2022 - 38
Sky & Telescope - August 2022 - 39
Sky & Telescope - August 2022 - 40
Sky & Telescope - August 2022 - 41
Sky & Telescope - August 2022 - 42
Sky & Telescope - August 2022 - 43
Sky & Telescope - August 2022 - 44
Sky & Telescope - August 2022 - 45
Sky & Telescope - August 2022 - 46
Sky & Telescope - August 2022 - 47
Sky & Telescope - August 2022 - 48
Sky & Telescope - August 2022 - 49
Sky & Telescope - August 2022 - 50
Sky & Telescope - August 2022 - 51
Sky & Telescope - August 2022 - 52
Sky & Telescope - August 2022 - 53
Sky & Telescope - August 2022 - 54
Sky & Telescope - August 2022 - 55
Sky & Telescope - August 2022 - 56
Sky & Telescope - August 2022 - 57
Sky & Telescope - August 2022 - 58
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Sky & Telescope - August 2022 - 60
Sky & Telescope - August 2022 - 61
Sky & Telescope - August 2022 - 62
Sky & Telescope - August 2022 - 63
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Sky & Telescope - August 2022 - 66
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Sky & Telescope - August 2022 - 69
Sky & Telescope - August 2022 - 70
Sky & Telescope - August 2022 - 71
Sky & Telescope - August 2022 - 72
Sky & Telescope - August 2022 - 73
Sky & Telescope - August 2022 - 74
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Sky & Telescope - August 2022 - 76
Sky & Telescope - August 2022 - 77
Sky & Telescope - August 2022 - 78
Sky & Telescope - August 2022 - 79
Sky & Telescope - August 2022 - 80
Sky & Telescope - August 2022 - 81
Sky & Telescope - August 2022 - 82
Sky & Telescope - August 2022 - 83
Sky & Telescope - August 2022 - 84
Sky & Telescope - August 2022 - Cover3
Sky & Telescope - August 2022 - Cover4
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