Sky and Telescope - February 2017 - 51

Jupiter's Moons
will transit 12/3 minutes earlier for each
degree less than 254°, and 12/3 minutes
later for each degree more than 254°.
The best magnification for Jupiter
with your scope depends on the seeing. I always start at low or moderate
powers, which make the planet small,
sharp, and bright, and when I think I've
exhausted what I can see, I move a step

up. There comes a point where higher
power just makes things worse. The better the seeing, the higher you can go.
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 Jupiter's reddish or brownish markings.

Feb 1
2
3

EAST

4
5
6

Phenomena of Jupiter's Moons, February 2017
Feb. 1

2:07
5:28
11:20
13:42
13:50
16:03
23:29

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

0:38
1:40
2:47
6:51
9:25
11:43
13:47
20:35
23:56

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

6:28
11:12
17:57
19:05
20:09
21:15

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

Feb. 4

15:03
18:23

I.Ec.D
I.Oc.R

Feb. 5

0:37
2:56
3:07
5:17
12:25
13:33
14:37
15:42
20:53
23:29

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

1:41
3:46
9:32
12:50
19:45

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

0:25
6:53
8:00
9:05
10:10

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

4:00
7:18

I.Ec.D
I.Oc.R

Feb. 2

Feb. 3

Feb. 6

Feb. 7

Feb. 8

13:54
16:09
16:24
18:30

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

1:22
2:27
3:33
4:37
10:49
13:22
15:27
17:28
22:28

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

1:45
9:02
13:38
19:50
20:54
22:02
23:04

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

Feb. 11

16:56
20:12

I.Ec.D
I.Oc.R

Feb. 12

3:11
5:22
5:41
7:43
14:18
15:21
16:30
17:31

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

0:51
3:26
5:22
7:24
11:25
14:39
22:19

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

2:50
8:47
9:49
10:58
11:58

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

5:53
9:06
16:28
18:35

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

Feb. 9

Feb. 10

Feb. 13

Feb. 14

Feb. 15

Feb. 16

Feb. 17

Feb. 18

Feb. 19

Feb. 20

Feb. 21

Feb. 22

18:58
20:55

II.Sh.E
II.Tr.E

Feb. 23

3:15
4:16
5:27
6:25
14:46
17:19
19:05
21:04

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

0:21
3:33
11:37
16:02
21:43
22:43
23:55

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

Feb. 25

0:52
18:50
22:00

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

Feb. 26

5:45
7:46
8:15
10:06
16:11
17:09
18:23
19:19

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

4:49
7:23
8:59
10:58
13:18
16:27

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

0:54
5:13
10:40
11:36
12:51
13:46

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

7:46
10:54
19:03
20:58
21:32
23:18

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

Feb. 24

Feb. 27

Feb. 28

WEST

Callisto

7

5:08
6:03
7:20
8:13
18:43
21:15
22:38

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

0:35
2:15
5:20
14:11
18:23
23:36

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

0:30
1:48
2:39
20:43
23:47

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

8:20
10:08
10:49
12:28
18:05
18:56
20:16
21:06

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

8:47
11:20
12:30
14:28
15:11
18:14

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

3:28
7:33
12:33
13:23
14:45
15:32
20:59
23:55
14:42
20:42

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

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 5 hours ahead of Eastern Standard 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
9
10

Ganymede

11
12
13

Io

14
15
16

Europa

17
18
19
20
21
22
23
24
25
26
27
28
Mar 1
2
3

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.



Sky and Telescope - February 2017

Table of Contents for the Digital Edition of Sky and Telescope - February 2017

Contents
Sky and Telescope - February 2017 - Cover1
Sky and Telescope - February 2017 - Cover2
Sky and Telescope - February 2017 - 1
Sky and Telescope - February 2017 - Contents
Sky and Telescope - February 2017 - 3
Sky and Telescope - February 2017 - 4
Sky and Telescope - February 2017 - 5
Sky and Telescope - February 2017 - 6
Sky and Telescope - February 2017 - 7
Sky and Telescope - February 2017 - 8
Sky and Telescope - February 2017 - 9
Sky and Telescope - February 2017 - 10
Sky and Telescope - February 2017 - 11
Sky and Telescope - February 2017 - 12
Sky and Telescope - February 2017 - 13
Sky and Telescope - February 2017 - 14
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Sky and Telescope - February 2017 - Cover3
Sky and Telescope - February 2017 - Cover4
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