My first Magazine Sky & Telescope - 04.2019 | Página 53

17:31; 26: 3:27, 13:22, 23:18; 27: 9:14,
19:09; 28: 5:05, 15:00; 29: 0:56, 10:52,
20:47; 30: 6:43, 16:38.
These times assume that the spot will
be centered at System II longitude 300°.
If the Red Spot has moved elsewhere, it
will transit 1 2 / 3 minutes earlier for each
degree less than 300° and 1 2 / 3 minutes
later for each degree more than 300°.
Features on Jupiter appear closer to
the central meridian than to the limb
for about 50 minutes before and after
transiting. A light blue or green fi lter
slightly increases the contrast and vis-
ibility of Jupiter’s reddish and brownish
markings.
Jupiter’s Moons
Apr 1
2
3
WEST
EAST
4
5
Phenomena of Jupiter’s Moons, April 2019
Apr. 1
Apr. 2
Apr. 3
Apr. 4
Apr. 5
Apr. 6
Apr. 7
Apr. 8
10:10
10:39
11:54
13:01
13:01
13:34
14:03
15:24
16:49
18:59 I.Ec.D
II.Sh.I
III.Sh.I
II.Sh.E
II.Tr.I
I.Oc.R
III.Sh.E
II.Tr.E
III.Tr.I
III.Tr.E
7:25
8:38
9:36
10:49 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
4:38
5:19
7:44
7:47
8:01
10:14 I.Ec.D
II.Ec.D
II.Ec.R
II.Oc.D
I.Oc.R
II.Oc.R
1:54
3:05
4:05
5:16
23:06
23:55 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
I.Ec.D
II.Sh.I
2:02
2:15
2:17
2:29
4:14
4:38
6:51
9:04
20:22
21:33
22:33
23:44 III.Ec.D
II.Tr.I
II.Sh.E
I.Oc.R
III.Ec.R
II.Tr.E
III.Oc.D
III.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
17:35
18:37
20:56
23:28 I.Ec.D
II.Ec.D
I.Oc.R
II.Oc.R
14:51
16:01
17:02
18:12 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
12:03
13:11 I.Ec.D
II.Sh.I
Apr. 9
Apr. 10
Apr. 11
Apr. 12
Apr. 13
Apr. 14
Apr. 15
15:24
15:28
15:34
15:52
17:51
18:02
20:35
22:45 I.Oc.R
II.Tr.I
II.Sh.E
III.Sh.I
II.Tr.E
III.Sh.E
III.Tr.I
III.Tr.E 9:19
10:28
11:30
12:39 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E Apr. 17
6:31
7:55
9:51
12:43 I.Ec.D
II.Ec.D
I.Oc.R
II.Oc.R Apr. 18
3:47
4:56
5:58
7:07 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E Apr. 19
0:59
2:28
4:18
4:40
4:50
5:59
7:04
8:12
10:34
12:46
22:16
23:23 I.Ec.D
II.Sh.I
I.Oc.R
II.Tr.I
II.Sh.E
III.Ec.D
II.Tr.E
III.Ec.R
III.Oc.D
III.Oc.R
I.Sh.I
I.Tr.I 0:27
1:34
19:28
21:13
22:45 I.Sh.E
I.Tr.E
I.Ec.D
II.Ec.D
I.Oc.R 1:56
16:44
17:50
18:55
20:01 II.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 13:56
15:44
17:13
17:53
18:07
19:50 I.Ec.D
II.Sh.I
I.Oc.R
II.Tr.I
II.Sh.E
III.Sh.I
Apr. 16
Apr. 20
Apr. 21
Apr. 22
Apr. 23
20:16
22:01 II.Tr.E
III.Sh.E 0:16
2:26
11:12
12:17
13:24
14:28 III.Tr.I
III.Tr.E
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 8:24
10:31
11:40
15:09 I.Ec.D
II.Ec.D
I.Oc.R
II.Oc.R Apr. 25
5:41
6:45
7:52
8:56 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E Apr. 26
2:52
5:00
6:07
7:04
7:24
9:28
9:57
12:10
14:12
16:24 I.Ec.D
II.Sh.I
I.Oc.R
II.Tr.I
II.Sh.E
II.Tr.E
III.Ec.D
III.Ec.R
III.Oc.D
III.Oc.R 0:09
1:12
2:20
3:23
21:21
23:48 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
I.Ec.D
II.Ec.D 0:34
4:21
18:38
19:39
20:49
21:50 I.Oc.R
II.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 15:49
18:17
19:00
20:15
20:40
22:39
23:47 I.Ec.D
II.Sh.I
I.Oc.R
II.Tr.I
II.Sh.E
II.Tr.E
III.Sh.I 2:00
3:52
6:02 III.Sh.E
III.Tr.I
III.Tr.E
Apr. 24
Apr. 27
Apr. 28
Apr. 29
Apr. 30
6
13:06
14:06
15:17
16:17 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 7
10:17
13:07
13:27
17:34 I.Ec.D
II.Ec.D
I.Oc.R
II.Oc.R 9
7:35
8:33
9:46
10:44 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 4:45
7:33
7:54
9:26
9:57
11:50
13:54
16:09
17:46
19:58 I.Ec.D
II.Sh.I
I.Oc.R
II.Tr.I
II.Sh.E
II.Tr.E
III.Ec.D
III.Ec.R
III.Oc.D
III.Oc.R 2:03
2:59
4:14
5:11
23:14 I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
I.Ec.D 2:21
2:24
6:45
20:31
21:26
22:43
23:37 I.Oc.R
II.Ec.D
II.Oc.R
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E 17:42
20:47
20:50
22:36
23:14 I.Ec.D
I.Oc.R
II.Sh.I
II.Tr.I
II.Sh.E 1:00
3:44
5:58
7:23
9:33
15:00
15:53
17:11
18:04 II.Tr.E
III.Sh.I
III.Sh.E
III.Tr.I
III.Tr.E
I.Sh.I
I.Tr.I
I.Sh.E
I.Tr.E
Every day, interesting events happen between Jupiter’s satellites and the planet’s disk or shadow. The fi rst 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.
8
Io
Europa
10
11
12
13
14
15
Callisto
16
17
18
19
20
21
22
23
24
25
26
Ganymede
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 24 h 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 yandtele scope.com • A PR I L 2 019
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