Sky and Telescope - September 2018 - 44

SEPTEMBER 2018 OBSERVING
Planetary Almanac

PLANET VISIBILITY Mercury: visible at dawn through the 11th * Venus: visible at dusk *
Mars: visible at dusk, highest before midnight * Jupiter: visible at dusk, sets early evening *
Saturn: highest at dusk, sets near midnight

Mercury

21

11

30

September Sun & Planets

Venus

16

Date

1

Declination

Elongation

Magnitude

1

10h

39.6m

+8° 28′

-

-26.8

31′ 42″

-

1.009

30

12h

24.0m

-2° 36′

-

-26.8

31′ 56″

-

1.002

1

9h

35.8m

+15° 04′

17° Mo

-0.8

6.4″

65%

1.056

11

10h 44.4m

+9° 55′

9° Mo

-1.4

5.3″

93%

1.280

21

11h 53.8m

+2° 19′

2° Ev

-1.8

4.8″

100%

1.387

30

12h 50.7m

-4° 42′

7° Ev

-1.0

4.8″

98%

1.407

1

13h

21.2m

-12° 01′

45° Ev

-4.6

29.1″

40%

0.572

11

13h 48.5m

-15° 58′

43° Ev

-4.7

33.6″

34%

0.496

21

14h 09.9m

-19° 11′

39° Ev

-4.8

39.3″

26%

0.425

30

14h 21.1m

-21º 10′

34° Ev

-4.8

45.5″

18%

0.367

1

20h

07.5m

-26º 00′

140° Ev

-2.1

20.9″

94%

0.449

16

20h

16.7m

-24° 38′

128° Ev

-1.7

18.2″

91%

0.514

30

20h 34.8m

-22° 46′

119° Ev

-1.3

16.0″

89%

0.587

1

14h 58.8m

-16° 04′

69° Ev

-1.9

34.8″

99%

5.668

30

15h 17.7m

-17° 26′

45° Ev

-1.8

32.7″

100%

6.035

1

18h

10.0m

-22° 42′

114° Ev

+0.4

17.3″

100%

9.611

30

18h

11.9m

-22° 46′

86° Ev

+0.5

16.5″

100%

10.080

Uranus

16

1h

58.9m

+11° 32′

141° Mo

+5.7

3.7″

100%

19.081

Neptune

16

23h 04.8m

-6° 59′

172° Ev

+7.8

2.4″

100%

28.945

Sun

Mercury
30
Mars

Venus
1

16

30

Jupiter

Mars

16
Saturn

Jupiter

Saturn

16
Uranus

Neptune
10"

10 h

8h
Castor
Pollux

+30°
+20°

LEO

Mercury
E

PT
CLI

IC

GEMINI

2h

8 am

E RIDA N U S

6 am

Illumination

PISCES
A Q U IL A

Distance

CETUS

Fomalhaut

10 pm

Mars
SAGITTARIUS
8 pm

16

+20°
+10°

VIRGO
LIBRA

20

Jupiter

13

Spica

-20°
-30°

SCORPIUS
4 pm

-10°

CORVUS

Venus

Antares

6 pm

12h

+30°

Arcturus

OPHIUCHUS

Saturn

LOCAL TIME OF TRANSIT
2 am
Midnight

14h

BOÖTES

A Q U A R IU S

Neptune

C A P R IC O R N U S

4 am

16 h

HERCULES

Sept
24 - 25

EQUATOR

CANIS
MAJOR

18 h
Vega

PEGASUS

Uranus

Rigel

H Y D R A

20 h

CYGNUS

TA U R U S

Betelgeuse

Sirius

10 am

0h
22h
RIGHT ASCENSION

ARIES

29

ORION

-30°
- 40°

Sept
3

CANCER

-10°
-20°

4h
Pleiades

6

Procyon

0°

6h

Diameter

The table above gives each object's right ascension and declination (equinox 2000.0) at 0h Universal Time on selected dates,
and its elongation from the Sun in the morning (Mo) or evening (Ev) sky. Next are the visual magnitude and equatorial diameter.
(Saturn's ring extent is 2.27 times its equatorial diameter.) Last are the percentage of a planet's disk illuminated by the Sun and
the distance from Earth in astronomical units. (Based on the mean Earth-Sun distance, 1 a.u. is 149,597,871 kilometers, or
92,955,807 international miles.) For other dates, see skyandtelescope.com/almanac.

PLANET DISKS have south up, to match the
view in many telescopes. Blue ticks indicate the
pole currently tilted toward Earth.
+40°

Right Ascension

DECLINATION

Sept 1

2 pm

-40°

The Sun and planets are positioned for mid-September; the colored arrows show the motion of each during the month. The Moon is plotted for evening dates in the Americas when it's waxing (right
side illuminated) or full, and for morning dates when it's waning (left side). "Local time of transit" tells when (in Local Mean Time) objects cross the meridian - that is, when they appear due south and
at their highest - at mid-month. Transits occur an hour later on the 1st, and an hour earlier at month's end.

44

S E P TE M B E R 2 018 * SK Y & TELESCOPE


http://www.skyandtelescope.com/almanac

Table of Contents for the Digital Edition of Sky and Telescope - September 2018

Contents
Sky and Telescope - September 2018 - Cover1
Sky and Telescope - September 2018 - Cover2
Sky and Telescope - September 2018 - 1
Sky and Telescope - September 2018 - Contents
Sky and Telescope - September 2018 - 3
Sky and Telescope - September 2018 - 4
Sky and Telescope - September 2018 - 5
Sky and Telescope - September 2018 - 6
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