Sky & Telescope - April 2020 - 51

Jupiter's Moons
15: 3:21, 13:17, 23:13; 16: 9:08, 19:04;
17: 5:00, 14:55; 18: 0:51, 10:47, 20:42;
19: 6:38, 16:34; 20: 2:29, 12:25, 22:21;
21: 8:16, 18:12; 22: 4:08, 14:03, 23:59;
23: 9:55, 19:50; 24: 5:46, 15:42; 25: 1:37,
11:33, 21:29; 26: 7:24, 17:20; 27: 3:16,
13:11, 23:07; 28: 9:03, 18:58; 29: 4:54,

14:50; 30: 0:45, 10:41, 20:37
These times assume that the spot will
be centered at System II longitude 330°.
If the Red Spot has moved elsewhere, it
will transit 12/3 minutes earlier for each
degree less than 330° and 12/3 minutes
later for each degree more than 330°.

Apr 1
2
3

WEST

EAST

4

Phenomena of Jupiter's Moons, April 2020
Apr. 1

Apr. 2

Apr. 3

Apr. 4

Apr. 5

Apr. 6

Apr. 7

Apr. 8

1:01
1:54
3:54
7:09
12:20
14:50
15:02
17:35
18:49
22:21

I.Tr.E
III.Sh.E
III.Tr.I
III.Tr.E
II.Sh.I
II.Tr.I
II.Sh.E
II.Tr.E
I.Ec.D
I.Oc.R

15:59
17:15
18:13
19:30

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

6:33
11:58
13:17
16:50

II.Ec.D
II.Oc.R
I.Ec.D
I.Oc.R

10:27
11:44
12:42
12:57
13:59
16:05
18:06
21:23

I.Sh.I
I.Tr.I
I.Sh.E
III.Ec.D
I.Tr.E
III.Ec.R
III.Oc.D
III.Oc.R

1:37
4:08
4:19
6:53
7:46
11:19

II.Sh.I
II.Tr.I
II.Sh.E
II.Tr.E
I.Ec.D
I.Oc.R

4:56
6:12
7:10
8:28
19:51

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
II.Ec.D

1:17
2:14
5:47
23:24

II.Oc.R
I.Ec.D
I.Oc.R
I.Sh.I

0:41
1:39
2:47
2:57
5:19
5:53
7:58
8:39
11:14

I.Tr.I
I.Sh.E
III.Sh.I
I.Tr.E
IV.Ec.D
III.Sh.E
III.Tr.I
IV.Ec.R
III.Tr.E

Apr. 9

Apr. 10

Apr. 11

Apr. 12

Apr. 13

Apr. 14

Apr. 15

14:54
17:21
17:26
17:36
20:11
20:42
21:14

II.Sh.I
IV.Oc.D
II.Tr.I
II.Sh.E
II.Tr.E
I.Ec.D
IV.Oc.R

0:16
17:53
19:10
20:07
21:25

I.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

9:09
14:37
15:11
18:45

II.Ec.D
II.Oc.R
I.Ec.D
I.Oc.R

12:21
13:38
14:36
15:54
16:56
20:05
22:09

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
III.Ec.D
III.Ec.R
III.Oc.D

1:27
4:11
6:44
6:53
9:29
9:39
13:13

III.Oc.R
II.Sh.I
II.Tr.I
II.Sh.E
II.Tr.E
I.Ec.D
I.Oc.R

6:49
8:07
9:04
10:22
22:26

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
II.Ec.D

Apr. 21

3:55
4:07
7:41

II.Oc.R
I.Ec.D
I.Oc.R

Apr. 22

1:18
2:36
3:33
4:51
6:45
9:52
11:59
15:16
17:28
20:01
20:10
22:36

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
III.Sh.I
III.Sh.E
III.Tr.I
III.Tr.E
II.Sh.I
II.Tr.I
II.Sh.E
I.Ec.D

Apr. 16

Apr. 17

Apr. 18

Apr. 19

Apr. 20

Apr. 23

22:46

II.Tr.E

2:10
12:32
15:52
19:46
21:04
22:01
23:19

I.Oc.R
IV.Sh.I
IV.Sh.E
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

0:43
4:36
11:45
17:04
17:14
20:38

IV.Tr.I
IV.Tr.E
II.Ec.D
I.Ec.D
II.Oc.R
I.Oc.R

14:15
15:32
16:29
17:48
20:54

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
III.Ec.D

0:04
2:08
5:27
6:45
9:17
9:27
11:32
12:03
15:06

III.Ec.R
III.Oc.D
III.Oc.R
II.Sh.I
II.Tr.I
II.Sh.E
I.Ec.D
II.Tr.E
I.Oc.R

8:43
10:01
10:58
12:16

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

1:02
6:00
6:31
9:34

II.Ec.D
I.Ec.D
II.Oc.R
I.Oc.R

3:11
4:29
5:26
6:45
10:43
13:51
15:56
19:14
20:01
22:33
22:44
0:29
1:19
4:03

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
III.Sh.I
III.Sh.E
III.Tr.I
III.Tr.E
II.Sh.I
II.Tr.I
II.Sh.E
I.Ec.D
II.Tr.E
I.Oc.R

Apr. 24

Apr. 25

Apr. 26

Apr. 27

Apr. 28

Apr. 29

Apr. 30

5
6

21:40
22:57
23:55

I.Sh.I
I.Tr.I
I.Sh.E

1:13
14:20
18:57
19:49
22:31
23:17

I.Tr.E
II.Ec.D
I.Ec.D
II.Oc.R
I.Oc.R
IV.Ec.D

8

2:46
11:19
15:19
16:08
17:25
18:23
19:41

IV.Ec.R
IV.Oc.D
IV.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

11

0:52
4:03
6:02
9:18
9:22
11:49
12:01
13:25
14:35
16:59

III.Ec.D
III.Ec.R
III.Oc.D
II.Sh.I
III.Oc.R
II.Tr.I
II.Sh.E
I.Ec.D
II.Tr.E
I.Oc.R

10:37
11:53
12:52
14:09

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E

20

3:38
7:54
9:05
11:27

II.Ec.D
I.Ec.D
II.Oc.R
I.Oc.R

22

5:05
6:21
7:20
8:37
14:42
17:52
19:50
22:35
23:08

I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
III.Sh.I
III.Sh.E
III.Tr.I
II.Sh.I
III.Tr.E

24

1:04
1:17
2:22
3:50
5:54
23:34

II.Tr.I
II.Sh.E
I.Ec.D
II.Tr.E
I.Oc.R
I.Sh.I

Every day,
day, interesting
interesting events
events happen
happen between
between Jupiter's
Jupiter's satellites
satellites and
and the
the planet's
planet's disk
disk or
or shadow.
shadow. The
The ﬁﬁrst
rst columns
columns give
give
Every
the
the date
date and
and mid-time
mid-time of
of the
the event,
event, in
in Universal
Universal Time
Time (which
(which is
is 44 hours
hours ahead
ahead of
of Eastern
Eastern Daylight
Daylight Time).
Time). Next
Next is
is the
the satellite
satellite
involved:
involved: II for
for Io,
Io, II
II Europa,
Europa, III
III Ganymede,
Ganymede, or
or IV
IV Callisto.
Callisto. Next
Next is
is the
the type
type of
of event:
event: Oc
Oc for
for an
an occultation
occultation of
of the
the satellite
satellite behind
behind
Jupiter's
Jupiter's limb,
limb, Ec
Ec for
for an
an eclipse
eclipse by
by Jupiter's
Jupiter's shadow,
shadow, Tr
Tr for
for aa transit
transit across
across the
the planet's
planet's face,
face, or
or Sh
Sh for
for the
the satellite
satellite casting
casting its
its
own shadow
shadow onto
onto Jupiter.
Jupiter. An
An occultation
occultation or
or eclipse
eclipse begins
begins when
when the
the satellite
satellite disappears
disappears (D)
(D) and
and ends
ends when
when itit reappears
reappears (R
(R ).
).
own
AA transit
transit or
or shadow
shadow passage
passage begins
begins at
at ingress
ingress (I)
(I) and
and ends
ends at
at egress
egress (E
(E ).
). Each
Each event
event is
is gradual,
gradual, taking
taking up
up to
to several
several minutes.
minutes.
Predictions
Predictions courtesy
courtesy IMCCE
IMCCE // Paris
Paris Observatory.
Observatory.

7

Callisto

9
10

12

Europa

13
14

Io

15
16
17
18
19

21

23

25

Ganymede

26
27
28
29
30
May 1

The wavy lines represent Jupiter's four big satellites. The
central vertical band is Jupiter itself. Each gray or black
horizontal band is one day, from 0 h (upper edge of band)
to 24h UT (GMT). UT dates are at left. Slide a paper's edge
down to your date and time, and read across to see the
satellites' positions east or west of Jupiter.

sk yandtelescope.org * APRIL 2 02 0

51
http://www.skyandtelescope.org
Sky & Telescope - April 2020

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