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4 AUSTRALIAN SKY & TELESCOPE JULY 2016

REGULARS

5Spectrum
By Jonathan Nally

8NewsNotes

12 Discoveries

34 Cosmic relief

40 New product showcase

74 Night Life / Astro Calendar

FEATURES

14 Revealing Jupiter’s inner
secrets
NASA scientists hope their Juno
orbiter will get the ‘inside story’
on our Solar System’s largest
planet.By Fran Bagenal

20 The nebula wars
A clash between two pioneer
sky photographers deepened the
growing split between amateur
and professional astronomy.
By Alan Hirshfeld

26 Dancing with planets
Millions of Trojan asteroids live
in gravitational ‘sweet spots’
that hold important keys to our
Solar System’s history. By Scott
S. Sheppard

36 Is red light really best?
Astronomers have long used
red light to protect their night
vision, but there may be a better
alternative.By Robert Dick

60 Southern sky tour, Part 1
Try our list of the Top 20 star
clusters of the southern skies.
By Glen Cozens & Judith Gooden

Contents

OBERVING & EXPLORING

42 Binocular highlight

The stars of Italy

By Mathew Wedel

44 Tonight's sky

Hooked on Scorpius

By Jonathan Nally

46 Sun, Moon and planets

Mercury and Venus meet up

By Jonathan Nally

47 Meteors

Spilling from the ‘water bearer’

By Con Stoitsis

48 Double star notes

Beyond the Scorpion’s claws

By Ross Gould

49 Comets

Sailingacrosssouthernskies

By David Seargent

50 Variable stars

Stars at the centre of attention

By Alan Plummer

52 Targets

Sliding along the Serpent’s tail

By Sue French

52 Exploring the Moon

The ABCs of lunar craters

ByCharlesA.Wood

56 Planetary observing

Hunt the moons of Mars

By Alan M. MacRobert

July 2016 ISSUE 94, VOL. 12, NO. 5

p.60 Star clusters – our Top 20 observing list

p.20 Astronomy’s first pro-am split