Astronomy

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LEO MINOR

ANT

LI

HYDRA

CRATER

VIRGO

BOÖTES VENATICICANES

BERENICESCOMA

SEXTANS

VE

LEO

CORVUS

BOREALISCORONA

CENTAURUS

CAPUTSERPENS

OPHIUCHUS

LIBRA

URSA

MAJOR

CASSIOPEIA

ARDALISP

URSA

MINOR

CEPHEUS

HERCULES

CYGNUS

LY R A DRACO

Spica

Arcturus

M104

M83

M5

M64

NGP

Denebola

M65 M66

Regulus

M51

M13

Mizar

NCP

M82

M81

Vega Polaris

C

NGC 5128

Jupiter

38 ASTRONOMY • APRIL 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:

midnight April 1

11 P.M. April 15

10 P.M. April 30

Planets are shown

at midmonth