Sky and Telescope - January 2017 - 47

* To find out what's visible in the sky from

December
solstice

your location, go to skypub.com/almanac.
Earth

Venus

MIDNIGHT TO DAWN
Jupiter rises in the middle of the
night and is highest during or before
morning twilight. The giant planet
brightens from magnitude -1.9 to -2.1
during January and grows from 35″ to
39″ wide. It passes through western
quadrature (90° west of the Sun) on
January 12th. Jupiter shines near Spica
all month - indeed, all year. The first
of three Jupiter-Spica conjunctions in
2017 occurs in the early morning hours
of January 20th, when the mighty world
beams within 4° of the star.

DAWN
Saturn and Mercury are low in the
southeast at dawn this month. The
ringed planet comes up about 1½ hours
before the Sun on New Year's Day,
about 3 hours before the Sun by the end
of January. Look for Antares about 14°
to Saturn's right or upper right.
Mercury becomes visible to Saturn's
lower left after January 5th or so. By
the 9th Mercury has brightened past
the magnitude +0.5 radiance of Saturn
and has closed to 7° from it. On that
day, 45 minutes before sunrise, Saturn
stands about 10° above the horizon

Uranus

45 minutes before sunrise

Mercury
Saturn

Sept.
equinox

Sun

Neptune

June
solstice

ORBITS OF THE PLANETS
The curved arrows show each inner planet's movement during January. The outer planets don't
change position enough in a month to notice at this scale.

with Mercury about 3° lower. Mercury
never gets closer to Saturn, but begins
edging away. By the time of Mercury's
greatest elongation, 24° from the Sun
on January 19th, 12° separates the pair.

EARTH & MOON
Earth is at perihelion, its closest to the
Sun in space, at 14h UT January 4th,
when it lies 0.98331 a.u. (147,100,998
km) from the Sun.
The Moon is lower right of Venus
on January 1st and upper left of it on
the 2nd. The Moon occults Mars and
Neptune for Southeast Asia on the 3rd
(local date). The waxing gibbous Moon

shines upper right of Aldebaran on the
8th and lower left of it on the 9th.
At dawn on January 19th the lastquarter Moon, Jupiter, and Spica form
a close triangle. The waning lunar crescent hangs about 3° upper left of Saturn at dawn on January 24th and about
6° above Mercury the next morning.
The waxing lunar crescent is well
below Venus on the evening of January
30th, then closes to create a tight triangle with Venus and Mars on the 31st.
■ Contributing Editor FRED SCHAAF
welcomes your letters and comments at
fschaaf@aol.com.

Jan 30-Feb 1

Moon
Feb 1

Around 7 pm

Antares

Moon
Jan 24
Saturn

Moon
Jan 26

March
equinox

Jupiter

Moon
Jan 23

Dawn, Jan 23 -26

Moon
Jan 25

Mars

Mars

Moon
Jan 31

SCOR PIUS

Venus

S A G I T TA R I U S

Mercury

Moon
Jan 30

Looking Southeast
p These scenes are drawn for near the middle of North America (latitude 40° north, longitude 90°
west); European observers should move each Moon symbol a quarter of the way toward the one for
the previous date. In the Far East, move the Moon halfway. The blue 10° scale bar is about the width
of your fist at arm's length. For clarity, the Moon is shown three times its actual apparent size.

Looking West-Southwest

s k y a n d t e l e s c o p e .c o m

* JANUARY 2017

47


http://www.skypub.com/almanac http://www.skyandtelescope.com

Sky and Telescope - January 2017

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

Contents
Sky and Telescope - January 2017 - Cover1
Sky and Telescope - January 2017 - Cover2
Sky and Telescope - January 2017 - 1
Sky and Telescope - January 2017 - Contents
Sky and Telescope - January 2017 - 3
Sky and Telescope - January 2017 - 4
Sky and Telescope - January 2017 - 5
Sky and Telescope - January 2017 - 6
Sky and Telescope - January 2017 - 7
Sky and Telescope - January 2017 - 8
Sky and Telescope - January 2017 - 9
Sky and Telescope - January 2017 - 10
Sky and Telescope - January 2017 - 11
Sky and Telescope - January 2017 - 12
Sky and Telescope - January 2017 - 13
Sky and Telescope - January 2017 - 14
Sky and Telescope - January 2017 - 15
Sky and Telescope - January 2017 - 16
Sky and Telescope - January 2017 - 17
Sky and Telescope - January 2017 - 18
Sky and Telescope - January 2017 - 19
Sky and Telescope - January 2017 - 20
Sky and Telescope - January 2017 - 21
Sky and Telescope - January 2017 - 22
Sky and Telescope - January 2017 - 23
Sky and Telescope - January 2017 - 24
Sky and Telescope - January 2017 - 25
Sky and Telescope - January 2017 - 26
Sky and Telescope - January 2017 - 27
Sky and Telescope - January 2017 - 28
Sky and Telescope - January 2017 - 29
Sky and Telescope - January 2017 - 30
Sky and Telescope - January 2017 - 31
Sky and Telescope - January 2017 - 32
Sky and Telescope - January 2017 - 33
Sky and Telescope - January 2017 - 34
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Sky and Telescope - January 2017 - 36
Sky and Telescope - January 2017 - 37
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Sky and Telescope - January 2017 - 41
Sky and Telescope - January 2017 - 42
Sky and Telescope - January 2017 - 43
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Sky and Telescope - January 2017 - 45
Sky and Telescope - January 2017 - 46
Sky and Telescope - January 2017 - 47
Sky and Telescope - January 2017 - 48
Sky and Telescope - January 2017 - 49
Sky and Telescope - January 2017 - 50
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Sky and Telescope - January 2017 - 58
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Sky and Telescope - January 2017 - 60
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Sky and Telescope - January 2017 - 63
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Sky and Telescope - January 2017 - 81
Sky and Telescope - January 2017 - 82
Sky and Telescope - January 2017 - 83
Sky and Telescope - January 2017 - 84
Sky and Telescope - January 2017 - Cover3
Sky and Telescope - January 2017 - Cover4
Sky and Telescope - January 2017 - SGA17RAL
Sky and Telescope - January 2017 - 90
Sky and Telescope - January 2017 - SGA17R
Sky and Telescope - January 2017 - SGA17RA
Sky and Telescope - January 2017 - SGA17EAL
Sky and Telescope - January 2017 - 94
Sky and Telescope - January 2017 - SGA17E
Sky and Telescope - January 2017 - SGA17EA
Sky and Telescope - January 2017 - SGA17SAL
Sky and Telescope - January 2017 - 98
Sky and Telescope - January 2017 - SGA17S
Sky and Telescope - January 2017 - SGA17SA
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