Sky & Telescope - June 2020 - 50

JUNE 2020 OBSERVING
Celestial Calendar

An African
and Asian
Annular
ON JUNE 21ST, the day after the June
solstice, the Moon will pass in front of
the Sun, producing an annular solar
eclipse. The Moon will be just six days
past apogee, with an apparent diameter
99.4% that of the Sun's - too small
to cover the solar disk completely. So,
instead of a total eclipse, observers will
be treated to the dramatic sight of the
silhouetted Moon encircled by a narrow
annulus of sunlight.
The path of annularity varies from
21 to 85 kilometers wide and stretches
from central Africa to Taiwan before
departing solid ground for the Pacific
Ocean. At the track's western end,
observers will witness the fiery annulus
for up to 82 seconds, low in the eastern
q An annular solar eclipse takes place on June
21st. The central track, shown in red, crosses
Africa, the Arabian Peninsula, and southern
Asia.

ern
North

artial eclipse
limit of p
20%

ends at sunrise
ipse
Ecl
clipse at sunrise
um e
nrise
xim
a
s at su
M
begin
e
s
p
Ecli

60%

80%

F
HO
PAT

ANN

80%
60%

40%
20%
ther
Sou

50

ULAR ECLIPSE

partial eclipse
it of
n lim

JUNE 2 02 0 * SK Y & TELESCOPE

sky shortly after sunrise. First contact
is at 3:46 UT, greatest eclipse occurs at
6:40 UT, and the Moon vacates the solar
disk at 9:34 UT. Visit Fred Espenak's
website (https://is.gd/June21eclipse)
to find viewing details for hundreds of
individual locations.
During a typical annular event, brilliant points of sunlight called Baily's
Beads shine through valleys along the
edge of the Moon, flashing into view
moments before and after maximum
eclipse. But the fit between Moon and
Sun this time is so tight that observers with safe eclipse glasses or properly filtered binoculars and telescopes
should get extended views of the Beads
as the jagged edge of the Moon breaks
the solar ring into numerous short
segments. Likewise, any bright
prominences along the Sun's
limb that appear as the
Moon advances eastward
across the solar disk
should be easy to photograph and see in a
telescope, provided you
keep the blindingly
bright portions of the
Sun safely out of view.
I've witnessed two
annular eclipses and
saw brief glimpses of
prominences and Baily's
Beads, but what really
made my jaw drop was seeing the Moon moving across
the Sun in real time.
begins at sunset
ipse
Ecl
imum eclipse at sunset
Max
Eclipse ends at sun
set

40%

p Fred Espenak captured this photograph of
the annular eclipse of February 16, 1999, when
the Moon covered 99.3% of the Sun's disk.
This month's eclipse is a very close match, with
the solar disk 99.4% obstructed.

AT THE START OF JUNE, Jupiter rises
just before midnight local daylight-saving time and transits the meridian during morning twilight, when it should
be a fine sight in telescopes. On June
1st the planet gleams at magnitude -2.6
and presents a disk 45″ in diameter.
Any scope shows the four big
Galilean moons, and binoculars usually
show at least two or three. In binoculars, the moons are all but indistinguishable from one another. They orbit
Jupiter at different rates, changing positions along an almost straight line from
our point of view on Earth. Use the
diagram on the facing page to identify
them by their relative positions on any
given date and time.
All the June interactions between
Jupiter and its satellites and their shadows are tabulated on the facing page.
Find events timed for dawn twilight in
your time zone, when Jupiter is at its
highest.
Features on Jupiter appear closer to
the central meridian than to the limb
for 50 minutes before and after transiting. Here are the times, in Universal
Time, when the Great Red Spot should
cross Jupiter's central meridian. The
dates, also in UT, are in bold. (Eastern
Daylight Time is UT minus 4 hours.)
May 1: 6:39; 16:34 2: 2:30; 12:26;
22:21 3: 8:17; 18:13 4: 4:08; 14:04;
23:59 5: 9:55; 19:51 6: 5:46; 15:42 7:
1:38; 11:33; 21:29 8: 7:25; 17:20 9: 3:16;
13:12; 23:07 10: 9:03; 18:58 11: 4:54;
14:50 12: 0:45; 10:41; 20:37 13: 6:32;
16:28 14: 2:23; 12:19; 22:15 15: 8:10;
18:06 16: 4:02; 13:57; 23:53 17: 9:48;
19:44 18: 5:40; 15:35 19: 1:31; 11:27;
21:22 20: 7:18; 17:13 21: 3:09; 13:05;
23:00 22: 8:56; 18:52 23: 4:47; 14:43
24: 0:38; 10:34; 20:30 25: 6:25; 16:21
26: 2:16; 12:12; 22:08 27: 8:03; 17:59
28: 3:54; 13:50; 23:46 29: 9:41; 19:37
30: 5:32; 15:28 31: 1:24; 11:19; 21:15
June 1: 7:11; 17:06 2: 3:02; 12:57;
22:53 3: 8:49; 18:44 4: 4:40; 14:35 5:
0:31; 10:26; 20:22 6: 6:18; 16:13 7: 2:09;
12:04; 22:00 8: 7:56; 17:51 9: 3:47;
13:42; 23:38 10: 9:34; 19:29 11: 5:25;
15:20 12: 1:16; 11:12; 21:07 13: 7:03;

A NNUL A R ECLIPSE DIAG R A M: G REGG DINDER M A N /
S&T, SOURCE: FRED ESPEN A K

Action at Jupiter


https://www.is.gd/June21eclipse

Sky & Telescope - June 2020

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

Contents
Sky & Telescope - June 2020 - Cover1
Sky & Telescope - June 2020 - Cover2
Sky & Telescope - June 2020 - 1
Sky & Telescope - June 2020 - Contents
Sky & Telescope - June 2020 - 3
Sky & Telescope - June 2020 - 4
Sky & Telescope - June 2020 - 5
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