Sky and Telescope - February 2017 - 50

FEBRUARY 2017 OBSERVING
Celestial Calendar

Jupiter High at Dawn
THE MOST INTERESTING PLANET for
amateur scopes continues to show itself
well only in the early-morning hours,
especially in the hour or two before
dawn. But it's getting nearer and bigger,
enlarging from 39″ to 42″ in equatorial
diameter during February.
Any telescope shows Jupiter's four
big Galilean moons. Binoculars usually show at least two or three. Identify
them at any date and time using the
diagram at far right.
All the interactions in February
between Jupiter and its satellites and
their shadows are tabulated on the facing page. Find events timed for when
Jupiter will be in good view for you.
And 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
Standard Time is UT minus 5 hours.)
January 1, 7:42, 17:37; 2, 3:33,
13:29, 23:25; 3, 9:20, 19:16; 4, 5:12,
15:07; 5, 1:03, 10:59, 20:54; 6, 6:50,
16:46; 7, 2:41, 12:37, 22:33; 8, 8:28,
18:24; 9, 4:20, 14:15; 10, 0:11, 10:07,
20:03; 11, 5:58, 15:54; 12, 1:50, 11:45,
21:41; 13, 7:37, 17:32; 14, 3:28, 13:24,
3:19; 15, 9:15, 19:11; 16, 5:06, 15:02;
17, 0:58, 10:53, 20:49; 18, 6:45, 16:40;
19, 2:36, 12:32, 22:27; 20, 8:23, 18:18;
21, 4:14, 14:10; 22, 0:05, 10:01, 19:57;
23, 5:52, 15:48; 24, 1:44, 11:39, 21:35;
25, 7:31, 17:26; 26, 3:22, 13:18, 23:13;
27, 9:09, 19:05; 28, 5:00, 14:56; 29,
0:52, 10:47, 20:43; 30, 6:38, 16:34; 31,
2:30, 12:25, 22:21.

February 1, 8:17, 18:12; 2, 4:08,
14:03, 23:59; 3, 9:55, 19:50; 4, 5:46,
15:42; 5, 1:37, 11:33, 21:29; 6, 7:24,
17:20; 7, 3:15, 13:11, 23:07; 8, 9:02,
18:58; 9, 4:54, 14:49; 10, 0:45, 10:40,
20:36; 11, 6:32, 16:27; 12, 2:23, 12:18,
22:14; 13, 8:10, 18:05; 14, 4:01, 13:57,
23:52; 15, 9:48, 19:43; 16, 5:39, 15:35;
17, 1:30, 11:26, 21:21; 18, 7:17, 17:13;
19, 3:08, 13:04, 22:59; 20, 8:55, 18:51;
21, 4:46, 14:42; 22, 0:37, 10:33, 20:29;
23, 6:24, 16:20; 24, 2:15, 12:11, 22:07;
25, 8:02, 17:58; 26, 3:53, 13:49, 23:45;
27, 9:40, 19:36; 28, 5:31, 15:27.
These times assume that the spot will
be centered at System II longitude 254°.
If the Red Spot has moved elsewhere
- it has been drifting toward increasing longitudes for many years now - it

Minima of Algol

S In this very sharp stacked-video image, Damian Peach caught orange Io and darker, gray
Ganymede casting their shadows onto Jupiter at 0:31 UT March 24, 2016. Color contrasts are
somewhat exaggerated. South is up.

50

F E B R U A R Y 2 0 1 7 * SK Y & TELESCOPE

Jan.

UT

Feb.

UT

2

11:52

3

0:54

5

8:41

5

21:43

8

5:30

8

18:32

11

2:19

11

15:22

13

23:09

14

12:11

16

19:58

17

9:00

19

16:47

20

5:50

22

13:37

23

2:39

25

10:26

25

23:28

28

7:15

28

20:18

31

4:04

Algol remains near minimum brightness for about
two hours. It takes several additional hours to
fade and to rebrighten. These geocentric predictions are from the heliocentric elements Min.
= JD 2445641.554+ 2.867324E, where E is any
integer. For a comparison-star chart and more
info, see skyandtelescope.com/algol.


http://www.skyandtelescope.com/algol

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
Sky and Telescope - February 2017 - 15
Sky and Telescope - February 2017 - 16
Sky and Telescope - February 2017 - 17
Sky and Telescope - February 2017 - 18
Sky and Telescope - February 2017 - 19
Sky and Telescope - February 2017 - 20
Sky and Telescope - February 2017 - 21
Sky and Telescope - February 2017 - 22
Sky and Telescope - February 2017 - 23
Sky and Telescope - February 2017 - 24
Sky and Telescope - February 2017 - 25
Sky and Telescope - February 2017 - 26
Sky and Telescope - February 2017 - 27
Sky and Telescope - February 2017 - 28
Sky and Telescope - February 2017 - 29
Sky and Telescope - February 2017 - 30
Sky and Telescope - February 2017 - 31
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Sky and Telescope - February 2017 - 33
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Sky and Telescope - February 2017 - 37
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Sky and Telescope - February 2017 - 40
Sky and Telescope - February 2017 - 41
Sky and Telescope - February 2017 - 42
Sky and Telescope - February 2017 - 43
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Sky and Telescope - February 2017 - 45
Sky and Telescope - February 2017 - 46
Sky and Telescope - February 2017 - 47
Sky and Telescope - February 2017 - 48
Sky and Telescope - February 2017 - 49
Sky and Telescope - February 2017 - 50
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Sky and Telescope - February 2017 - 81
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Sky and Telescope - February 2017 - 83
Sky and Telescope - February 2017 - 84
Sky and Telescope - February 2017 - Cover3
Sky and Telescope - February 2017 - Cover4
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