Astronomy

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CANIS

MAJOR

LEPUS

ERIDANUS

FORNAX

HOROLOGIUM

CAELUM

COLUMBA

PUPPIS

ARIES

ORION

CANIS MINOR

HYDRA

TAURUS

CANCER

CAMELOPARDALIS

URSA

MINOR

CASSIOPEIA

PERSEUS

URSA MAJOR

LEO MINOR

EPHEUSC

TRIANGULUM

LYNX

AURIGA

GEMINI

LEO

MONOCEROS

DRACO

M42

Rigel

M41

M35

Aldebaran

Betelgeuse Hyades

Procyon

M1

M33

M37

M36

M38

Pleiades

M47 Sirius

M44

Capella

Pollux

Algol

Polaris

M81 M82 NCP

NGC 869

NGC

884

Mira

Castor

Adhara

38 ASTRONOMY • JANUARY 2018

STAR

DOME

Sirius

0.0

1.0

2.0

E

N

S

NE

SE

3.0

4.0

5.0

STAR

MAGNITUDES

STAR COLORS
A star’s color depends
on its surface temperature.

• The hottest stars shine blue


• Slightly cooler stars appear white


• Intermediate stars (like the Sun) glow yellow


• Lower-temperature stars appear orange


• The coolest stars glow red


• Fainter stars can’t excite our eyes’ color
  receptors, so they appear white unless you
  use optical aid to gather more light

How to use this map: This map portrays the

sky as seen near 35° north latitude. Located

inside the border are the cardinal directions

and their intermediate points. To find

stars, hold the map overhead and

orient it so one of the labels matches

the direction you’re facing. The

stars above the map’s horizon

now match what’s in the sky.

The all-sky map shows

how the sky looks at:

9 P.M. January 1

8 P.M. January 15

7 P.M. January 31

Planets are shown

at midmonth