Sky and Telescope - February 2017 - 46

FEBRUARY 2017 OBSERVING
Sun, Moon & Planets by Fred Schaaf

Brilliant Venus Owns the Evening Sky
Mars accompanies the bright planet early; Jupiter shows up a bit later.

T

his is an eclipse month. On the
night of February 10-11, a deep
penumbral eclipse of the Moon occurs
for viewers in the Americas, Europe,
Africa, and Asia. On February 26th, an
annular eclipse of the Sun is visible in
a narrow band across parts of southern
Chile and Argentina and the South
Atlantic to Angola and Zambia.
Venus blazes in the west for a few
hours after sunset, at its greatest brilliance of the year. Modestly bright Mars
follows Venus fairly closely down to
the horizon. By late February Jupiter,
accompanied by Spica, rises before Mars
sets and shines prominently the rest of
the night. Saturn comes up well before
dawn, while Mercury rises lower and
lower in the morning twilight until it's
lost late in the month.

due south in mid-afternoon. At night,
at really dark observing locations, look
for shadows cast by the radiant planet,
especially on snow or a white wall. Be
sure your eyes are well dark-adapted.
Venus reaches a peak sunset altitude of 40° on February 3rd as seen
from latitude 40° north. Although
Venus only declines to about 32° high
at sunset by the end of the month, the
interval between sunset and Venus-set
shrinks from about 3¾ to 2¾ hours.
Telescopes show Earth's sister planet
swelling from 31″ to 46″ in diameter
(wider than Jupiter), while its phase
thins dramatically from 40% to 18% lit.
Venus displays its greatest illuminated
extent (maximum illuminated area in
square arcseconds) on February 16th.

DUSK TO MID-EVENING
Venus dominates the sky in the westsouthwest to west, blazing at a stunning magnitude -4.8 all month. This is
a prime time to try to see Venus with
the naked eye in daylight; it's highest

Dawn, Feb 10 -12
Denebola

1 hour before sunrise

Around 7 pm

Moon
Feb 16

Moon
Feb 15
Jupiter

Spica

LEO
γ

Moon
Feb 12

Feb 4 and 5

Mars, easy to find to the upper
left of beacon-like Venus, fades from
magnitude +1.1 to +1.3 in February,
while its disk dwindles from 5.1″ to 4.6″
(one-tenth the diameter of Venus at
month's end). Venus reaches a minimum separation of 5.4° west of Mars
on February 1st, and then, slowing its
eastward motion, loses ground on (also
eastbound) Mars. Thus they barely miss
having a quasi-conjunction, defined as
two planets coming within 5° of each
other without passing. They're about
12° apart by month's end.
Mars opens February setting only
20 minutes after Venus but ends the
month setting about 50 minutes after
Venus (as viewed from mid-northern
latitudes). The two move eastward

γ Vir
VIRGO

Dawn, Feb 15 and 16
1 hour before sunrise

Sickle

Pleiades
Regulus

TA U R U S
Moon
Feb 5

Hyades

Moon
Feb 4

Moon
Feb 11

Aldebaran

Moon
Feb 10

10°

Looking South, high in the sky

46

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

Looking West

Looking Southwest



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
Sky and Telescope - February 2017 - 32
Sky and Telescope - February 2017 - 33
Sky and Telescope - February 2017 - 34
Sky and Telescope - February 2017 - 35
Sky and Telescope - February 2017 - 36
Sky and Telescope - February 2017 - 37
Sky and Telescope - February 2017 - 38
Sky and Telescope - February 2017 - 39
Sky and Telescope - February 2017 - 40
Sky and Telescope - February 2017 - 41
Sky and Telescope - February 2017 - 42
Sky and Telescope - February 2017 - 43
Sky and Telescope - February 2017 - 44
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
Sky and Telescope - February 2017 - 51
Sky and Telescope - February 2017 - 52
Sky and Telescope - February 2017 - 53
Sky and Telescope - February 2017 - 54
Sky and Telescope - February 2017 - 55
Sky and Telescope - February 2017 - 56
Sky and Telescope - February 2017 - 57
Sky and Telescope - February 2017 - 58
Sky and Telescope - February 2017 - 59
Sky and Telescope - February 2017 - 60
Sky and Telescope - February 2017 - 61
Sky and Telescope - February 2017 - 62
Sky and Telescope - February 2017 - 63
Sky and Telescope - February 2017 - 64
Sky and Telescope - February 2017 - 65
Sky and Telescope - February 2017 - 66
Sky and Telescope - February 2017 - 67
Sky and Telescope - February 2017 - 68
Sky and Telescope - February 2017 - 69
Sky and Telescope - February 2017 - 70
Sky and Telescope - February 2017 - 71
Sky and Telescope - February 2017 - 72
Sky and Telescope - February 2017 - 73
Sky and Telescope - February 2017 - 74
Sky and Telescope - February 2017 - 75
Sky and Telescope - February 2017 - 76
Sky and Telescope - February 2017 - 77
Sky and Telescope - February 2017 - 78
Sky and Telescope - February 2017 - 79
Sky and Telescope - February 2017 - 80
Sky and Telescope - February 2017 - 81
Sky and Telescope - February 2017 - 82
Sky and Telescope - February 2017 - 83
Sky and Telescope - February 2017 - 84
Sky and Telescope - February 2017 - Cover3
Sky and Telescope - February 2017 - Cover4
https://www.nxtbook.com/nxtbooks/aas/st_202012
https://www.nxtbook.com/nxtbooks/aas/st_202011
https://www.nxtbook.com/nxtbooks/aas/st_202010
https://www.nxtbook.com/nxtbooks/aas/st_202009
https://www.nxtbook.com/nxtbooks/aas/st_202008
https://www.nxtbook.com/nxtbooks/aas/st_202007
https://www.nxtbook.com/nxtbooks/aas/st_202006
https://www.nxtbook.com/nxtbooks/aas/st_202005
https://www.nxtbook.com/nxtbooks/aas/st_202004
https://www.nxtbook.com/nxtbooks/aas/st_202003
https://www.nxtbook.com/nxtbooks/aas/st_202002
https://www.nxtbook.com/nxtbooks/aas/st_202001
https://www.nxtbook.com/nxtbooks/aas/st_201912
https://www.nxtbook.com/nxtbooks/aas/st_201911
https://www.nxtbook.com/nxtbooks/aas/st_201910
https://www.nxtbook.com/nxtbooks/aas/st_201909
https://www.nxtbook.com/nxtbooks/aas/st_201908
https://www.nxtbook.com/nxtbooks/aas/st_201907
https://www.nxtbook.com/nxtbooks/aas/st_201906
https://www.nxtbook.com/nxtbooks/aas/st_201905
https://www.nxtbook.com/nxtbooks/aas/st_201904
https://www.nxtbook.com/nxtbooks/aas/st_201903
https://www.nxtbook.com/nxtbooks/aas/st_201902
https://www.nxtbook.com/nxtbooks/aas/st_201901
https://www.nxtbook.com/nxtbooks/aas/st_201812
https://www.nxtbook.com/nxtbooks/aas/st_201811
https://www.nxtbook.com/nxtbooks/aas/st_201810
https://www.nxtbook.com/nxtbooks/aas/st_201809
https://www.nxtbook.com/nxtbooks/aas/st_201808
https://www.nxtbook.com/nxtbooks/aas/st_201807
https://www.nxtbook.com/nxtbooks/aas/st_201806
https://www.nxtbook.com/nxtbooks/aas/st_201805
https://www.nxtbook.com/nxtbooks/aas/st_201804
https://www.nxtbook.com/nxtbooks/aas/st_201803
https://www.nxtbook.com/nxtbooks/aas/st_201802
https://www.nxtbook.com/nxtbooks/aas/st_201801
https://www.nxtbook.com/nxtbooks/aas/st_201712
https://www.nxtbook.com/nxtbooks/aas/st_201711
https://www.nxtbook.com/nxtbooks/aas/st_201710
https://www.nxtbook.com/nxtbooks/aas/st_201709
https://www.nxtbook.com/nxtbooks/aas/st_201708
https://www.nxtbook.com/nxtbooks/aas/st_201707
https://www.nxtbook.com/nxtbooks/aas/st_201706
https://www.nxtbook.com/nxtbooks/aas/st_201705
https://www.nxtbook.com/nxtbooks/aas/st_201704
https://www.nxtbook.com/nxtbooks/aas/st_201703
https://www.nxtbook.com/nxtbooks/aas/st_201702
https://www.nxtbook.com/nxtbooks/aas/st_201701
https://www.nxtbook.com/nxtbooks/aas/st_201612
https://www.nxtbook.com/nxtbooks/aas/st_201611
https://www.nxtbook.com/nxtbooks/newtrack/st_201612
https://www.nxtbook.com/nxtbooks/aas/st_201610
https://www.nxtbook.com/nxtbooks/aas/st_201609
https://www.nxtbook.com/nxtbooks/aas/st_201608
https://www.nxtbook.com/nxtbooks/aas/st_201607
https://www.nxtbook.com/nxtbooks/aas/st_201606
https://www.nxtbook.com/nxtbooks/aas/st_201605
https://www.nxtbook.com/nxtbooks/aas/st_201604
https://www.nxtbook.com/nxtbooks/aas/st_201603
https://www.nxtbook.com/nxtbooks/aas/st_201602
https://www.nxtbook.com/nxtbooks/aas/st_201601
https://www.nxtbook.com/nxtbooks/aas/st_201512
https://www.nxtbook.com/nxtbooks/aas/st_201511
https://www.nxtbook.com/nxtbooks/aas/st_201510
https://www.nxtbook.com/nxtbooks/aas/st_201509
https://www.nxtbook.com/nxtbooks/aas/st_201508
https://www.nxtbook.com/nxtbooks/aas/st_201507
https://www.nxtbook.com/nxtbooks/aas/st_201506
https://www.nxtbook.com/nxtbooks/aas/st_201505
https://www.nxtbook.com/nxtbooks/aas/st_201504
https://www.nxtbook.com/nxtbooks/aas/st_201503
https://www.nxtbook.com/nxtbooks/aas/st_201502
https://www.nxtbook.com/nxtbooks/aas/st_201501
https://www.nxtbook.com/nxtbooks/aas/st_201412
https://www.nxtbook.com/nxtbooks/aas/st_201411
https://www.nxtbook.com/nxtbooks/aas/st_201410
https://www.nxtbook.com/nxtbooks/aas/st_201409
https://www.nxtbook.com/nxtbooks/aas/st_201408
https://www.nxtbook.com/nxtbooks/aas/st_201407
https://www.nxtbook.com/nxtbooks/aas/st_201406
https://www.nxtbook.com/nxtbooks/aas/st_mars
https://www.nxtbook.com/nxtbooks/aas/st_201405
https://www.nxtbook.com/nxtbooks/aas/st_201404
https://www.nxtbook.com/nxtbooks/aas/st_201403
https://www.nxtbook.com/nxtbooks/aas/st_201402
https://www.nxtbook.com/nxtbooks/aas/st_201401
https://www.nxtbook.com/nxtbooks/aas/st_201312
https://www.nxtbook.com/nxtbooks/aas/st_201311
https://www.nxtbook.com/nxtbooks/aas/st_201310
https://www.nxtbook.com/nxtbooks/aas/st_201309
https://www.nxtbook.com/nxtbooks/aas/st_201308
https://www.nxtbook.com/nxtbooks/aas/st_201307
https://www.nxtbook.com/nxtbooks/aas/st_201306
https://www.nxtbook.com/nxtbooks/aas/st_201305
https://www.nxtbook.com/nxtbooks/aas/st_201304
https://www.nxtbook.com/nxtbooks/aas/st_201303
https://www.nxtbook.com/nxtbooks/aas/st_201302
https://www.nxtbook.com/nxtbooks/aas/st_201301
https://www.nxtbook.com/nxtbooks/aas/st_201212
https://www.nxtbook.com/nxtbooks/aas/st_201211
https://www.nxtbook.com/nxtbooks/aas/st_201210
https://www.nxtbook.com/nxtbooks/aas/st_201209
https://www.nxtbook.com/nxtbooks/aas/st_201208
https://www.nxtbook.com/nxtbooks/aas/st_201207
https://www.nxtbook.com/nxtbooks/aas/st_201206
https://www.nxtbook.com/nxtbooks/aas/st_201205
https://www.nxtbook.com/nxtbooks/aas/st_201204
https://www.nxtbook.com/nxtbooks/aas/st_201203
https://www.nxtbook.com/nxtbooks/aas/st_201202
https://www.nxtbook.com/nxtbooks/aas/st_201201
https://www.nxtbook.com/nxtbooks/aas/st_201112
https://www.nxtbook.com/nxtbooks/aas/st_201111
https://www.nxtbook.com/nxtbooks/aas/st_201110
https://www.nxtbook.com/nxtbooks/aas/st_201109
https://www.nxtbook.com/nxtbooks/aas/st_201108
https://www.nxtbook.com/nxtbooks/aas/st_201107
https://www.nxtbook.com/nxtbooks/aas/st_201106
https://www.nxtbook.com/nxtbooks/aas/st_201105
https://www.nxtbook.com/nxtbooks/aas/st_201104
https://www.nxtbook.com/nxtbooks/aas/st_201103
https://www.nxtbook.com/nxtbooks/aas/st_201102
https://www.nxtbook.com/nxtbooks/aas/st_201101
https://www.nxtbook.com/nxtbooks/aas/st_201012
https://www.nxtbook.com/nxtbooks/aas/st_201011
https://www.nxtbook.com/nxtbooks/aas/st_201010
https://www.nxtbook.com/nxtbooks/aas/st_201009
https://www.nxtbook.com/nxtbooks/aas/st_201008
https://www.nxtbook.com/nxtbooks/aas/st_201007
https://www.nxtbook.com/nxtbooks/aas/st_201006
https://www.nxtbook.com/nxtbooks/aas/st_201005
https://www.nxtbook.com/nxtbooks/aas/st_201004
https://www.nxtbook.com/nxtbooks/aas/st_201003
https://www.nxtbook.com/nxtbooks/aas/st_201002
https://www.nxtbook.com/nxtbooks/aas/st_201001
https://www.nxtbookmedia.com