Sky & Telescope - September 2020 - 51

Jupiter's Moons
22:06; 19: 8:01, 17:57; 20: 3:53, 13:49,
23:44; 21: 9:40, 19:36; 22: 5:32, 15:27;
23: 1:23, 11:19, 21:15; 24: 7:10, 17:06;
25: 3:02, 12:58, 22:53; 26: 8:49, 18:45;
27: 4:41, 14:36; 28: 0:32, 10:28, 20:24;
29: 6:20, 16:15; 30: 2:11, 12:07, 22:03

These times assume that the spot
will be centered at System II longitude
340° on September 1st. If the Red Spot
has moved, it will transit 12/3 minutes
earlier or later for each degree less or
more than 340°.

Phenomena of Jupiter's Moons, September 2020
Sept. 1

Sept. 2

Sept. 3

Sept. 4

Sept. 5

Sept. 6

Sept. 7

Sept. 8

1:53
5:29
7:32
8:16
10:21
19:54
20:22
20:56
22:10
23:13
23:42

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

0:34
4:00
17:01
20:22

III.Ec.D
III.Ec.R
I.Oc.D
I.Ec.R

0:31
5:31
14:21
15:25
16:37
17:42

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

11:28
14:50
18:42
20:50
21:28
23:39

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

8:49
9:54
10:07
11:05
12:10
13:19
13:26
14:32
17:25
17:56
23:37

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

3:58
5:56
9:19
13:45
18:50

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

3:16
4:23
5:32
6:39

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

0:23
3:48
7:54
10:08

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

10:41
12:57
21:44
22:52

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

0:00
0:00
1:08
3:21
4:35
8:01
18:51
22:17

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

2:58
8:09
16:12
17:21
18:27
19:37

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

Sept. 11 13:18
16:45
21:08
23:27
23:54

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

Sept. 12

2:16
10:39
11:49
12:55
13:47
14:06
17:07
18:32
21:57

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

7:46
11:14
16:12
19:44
21:27
23:47

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

5:07
6:18
6:57
7:23
8:34
11:18

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

2:14
5:43
10:22
12:45
13:08
15:34
23:35

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

Sept. 9

Sept. 10

Sept. 13

Sept. 14

Sept. 15

Sept. 16

0:47
1:51
3:03
3:44
7:05
8:36
12:03
20:42

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

0:12
5:27
10:46
18:03
19:16
20:19
21:32

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

Sept. 18 15:10
18:41
23:36

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

Sept. 19

2:03
2:23
4:52
12:31
13:45
14:47
16:01
17:33
20:52
22:32

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

1:58
9:38
13:10
18:42

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

0:04
6:59
8:14
9:15
10:30

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

4:06
5:55
7:39
10:03
12:52
15:21
15:38
17:43
18:11
22:09

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

1:27
2:42
3:43
4:58

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

Sept. 17

Sept. 20

Sept. 21

Sept. 22

Sept. 23

Sep 1
2
3

5

III.Oc.D
III.Oc.R
III.Ec.D
III.Ec.R
I.Oc.D

2:07
7:58
13:23
19:56
21:11
22:11
23:27

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

Sept. 25 17:02
20:36

I.Oc.D
I.Ec.R

12

Sept. 26

2:07
4:40
4:54
7:29
14:24
15:40
16:40
17:56
21:24

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

13

0:43
2:34
6:00
11:31
15:05
21:15

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

18

2:41
8:52
10:09
11:08
12:25

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

21

5:59
9:34
15:24
17:58
18:11
20:48

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

24

3:21
4:38
5:36
6:54
11:23
12:50
14:45
16:36
16:56
20:04

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

27

Sept. 27

Sept. 28

Sept. 29

Sept. 30

Every day, interesting events happen between Jupiter's satellites and the planet's disk or shadow. The ﬁrst columns give
the date and mid-time of the event, in Universal Time (which is 4 hours ahead of Eastern Daylight Time). Next is the satellite
involved: I for Io, II Europa, III Ganymede, or IV Callisto. Next is the type of event: Oc for an occultation of the satellite behind
Jupiter's limb, Ec for an eclipse by Jupiter's shadow, Tr for a transit across the planet's face, or Sh for the satellite casting its
own shadow onto Jupiter. An occultation or eclipse begins when the satellite disappears (D) and ends when it reappears (R ).
A transit or shadow passage begins at ingress (I) and ends at egress (E ). Each event is gradual, taking up to several minutes.
Predictions courtesy IMCCE / Paris Observatory.

WEST

4

7:31
10:53
12:36
16:04
22:34
Sept. 24

EAST

6
7
8
9
10

Io

11

Europa

14
15
16
17

Callisto

19
20

22

Ganymede

23

25
26

28
29
30
Oct 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.

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Sky & Telescope - September 2020

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