Sky and Telescope - September 2018 - 51

Action at Jupiter
JUPITER, LOW IN THE WEST-SOUTHWEST on September evenings, is

becoming increasingly difficult to
observe from mid-northern latitudes.
The gas giant is on its way to a conjunction with the Sun on November
26th. On September 1st, Jupiter sets a
little more than hour after the end of
twilight. By the end of the month, the
planet drops below the horizon within
minutes of twilight's end.
When the sky is dark and the seeing is relatively steady, any telescope
shows the four big Galilean moons, and
binoculars usually show at least two or
three. Use the diagram on page 49 to
identify them at any date and time.
All of the September interactions
between Jupiter and its satellites and
their shadows are tabulated at right.
Find events timed for when Jupiter is at
its highest in the early evening hours.
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.)
Aug. 1, 0:54, 10:49, 20:45; 2, 6:41,
16:37; 3, 2:33, 12:28, 22:24; 4, 8:20,
18:16; 5, 4:11, 14:07; 6, 0:03, 9:59,
19:54; 7, 5:50, 15:46; 8, 1:42, 11:38,
21:33; 9, 7:29, 17:25; 10, 3:21, 13:17,
23:12; 11, 9:08, 19:04; 12, 5:00, 14:56;
13, 0:51, 10:47, 20:43; 14, 6:39, 16:35;
15, 2:30, 12:26, 22:22; 16, 8:18, 18:14;
17, 4:09, 14:05; 18, 0:01, 9:57, 19:53;
19, 5:48, 15:44; 20, 1:40, 11:36, 21:32;
21, 7:27, 17:23; 22, 3:19, 13:15, 23:11;
23, 9:06, 19:02; 24, 4:58, 14:54; 25,
0:50, 10:45, 20:41; 26, 6:37, 16:33; 27,
2:29, 12:25, 22:20; 28, 8:16, 18:12; 29,
4:08, 14:04, 23:59; 30, 9:55, 19:51; 31,
5:47, 15:43.
Sept. 1, 1:39, 11:34, 21:30; 2, 7:26,
17:22; 3, 3:18, 13:13, 23:09; 4, 9:05,
19:01; 5, 4:57, 14:53; 6, 0:48, 10:44,
20:40; 7, 6:36, 16:32; 8, 2:28, 12:23,
22:19; 9, 8:15, 18:11; 10, 4:07, 14:03,
23:58; 11, 9:54, 19:50; 12, 5:46, 15:42;
13, 1:37, 11:33, 21:29; 14, 7:25, 17:21;
15, 3:17, 13:12, 23:08; 16, 9:04, 19:00;
17, 4:56, 14:52; 18, 0:47, 10:43, 20:39;
19, 6:35, 16:31; 20, 2:27, 12:22, 22:18;

21, 8:14, 18:10; 22, 4:06, 14:02, 23:58;
23, 9:53, 19:49; 24, 5:45, 15:41; 25,
1:37, 11:33, 21:28; 26, 7:24, 17:20; 27,
3:16, 13:12, 23:08; 28, 9:03, 18:59; 29,
4:55, 14:51; 30, 0:47, 10:43, 20:38.
These times assume that the spot will
be centered at System II longitude 292°.
If the Red Spot has moved elsewhere, it

will transit 12/3 minutes earlier for each
degree less than 292° and 12/3 minutes
later for each degree more than 292°.
Features on Jupiter appear closer to
the central meridian than to the limb
for 50 minutes before and after transiting. A light blue or green filter slightly
increases the contrast of red features.

Phenomena of Jupiter's Moons, September 2018
Sept. 1

0:00
3:23
21:16
21:25
22:06
22:26
23:25
23:45
23:47

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

0:12
0:34
2:03
3:02
4:50
18:29
21:52

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

15:45
16:07
16:54
17:55
18:27
18:31
19:03
20:48

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

Sept. 4

12:59
16:20

I.Oc.D
I.Ec.R

Sept. 5

10:15
10:46
11:23
12:00
12:24
13:32
14:04
15:20
16:48
18:35

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

Sept. 6

7:29
10:49

I.Oc.D
I.Ec.R

Sept. 7

4:44
5:29
5:52
6:54
7:49
7:50
8:00
10:06

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

1:59
5:18

I.Oc.D
I.Ec.R

Sept. 2

Sept. 3

Sept. 8

23:14

I.Tr.I

0:06
0:20
1:23
2:19
2:29
4:26
4:38
7:01
8:50
20:28
23:47

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

Sept. 10 17:43
18:49
18:52
19:53
20:58
21:09
21:12
23:25

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

Sept. 11 14:58
18:16

I.Oc.D
I.Ec.R

Sept. 12 12:13
13:18
13:28
14:23
15:26
16:14
17:55
18:19
20:47
22:34

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

Sept. 13

9:28
12:44

I.Oc.D
I.Ec.R

Sept. 14

6:43
7:46
8:14
8:52
9:55
10:27
10:35
12:44

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

Sept. 15

3:58
7:13

I.Oc.D
I.Ec.R

Sept. 16

1:12
2:15
2:49
3:22

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

Sept. 9

4:24
6:35
7:12
8:42
11:00
12:49
22:28

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

Sept. 17

1:42
19:42
20:43
21:38
21:52
22:52
23:46
23:58

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

Sept. 18

2:03
16:58
20:11

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

Sept. 19 14:12
15:12
16:11
16:22
17:21
20:30
20:32
22:37

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

Sept. 20

0:46
2:34
11:28
14:40

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

Sept. 21

8:41
9:41
10:51
11:01
11:50
13:05
13:22
15:21

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

Sept. 22

5:58
9:09

I.Oc.D
I.Ec.R

Sept. 23

3:11
4:09
5:21
5:33
6:18
9:47
10:53
13:00

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

14:59
16:48

III.Ec.D
III.Ec.R

Sept. 24

0:28
3:37
21:41
22:38
23:51

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

Sept. 25

0:25
0:47
2:24
2:46
4:40
18:58
22:06

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

Sept. 26 16:11
17:07
18:21
18:55
19:16
23:05

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

Sept. 27

0:51
2:56
4:45
6:33
13:28
16:35

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

Sept. 28 10:41
11:35
12:51
13:44
13:49
15:42
16:09
17:59

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

Sept. 29

7:58
11:04

I.Oc.D
I.Ec.R

Sept. 30

5:11
6:04
7:21
8:13
8:17
12:22
15:14
17:21
18:58
20:48

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

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.

sk yandtelescope.com * S E P TE M B E R 2 018

51


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Table of Contents for the Digital Edition of Sky and Telescope - September 2018

Contents
Sky and Telescope - September 2018 - Cover1
Sky and Telescope - September 2018 - Cover2
Sky and Telescope - September 2018 - 1
Sky and Telescope - September 2018 - Contents
Sky and Telescope - September 2018 - 3
Sky and Telescope - September 2018 - 4
Sky and Telescope - September 2018 - 5
Sky and Telescope - September 2018 - 6
Sky and Telescope - September 2018 - 7
Sky and Telescope - September 2018 - 8
Sky and Telescope - September 2018 - 9
Sky and Telescope - September 2018 - 10
Sky and Telescope - September 2018 - 11
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Sky and Telescope - September 2018 - 13
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Sky and Telescope - September 2018 - Cover3
Sky and Telescope - September 2018 - Cover4
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