Sky & Telescope - July 2020 - 2

CONTENTS

THE ESSENTIAL GUIDE TO ASTRONOMY

July 2020

VOL. 140, NO. 1

FEATURES

Io, the Volcanic
Rosetta Stone
Giant eruptions and vast lava ﬁelds
cover Jupiter's tempestuous inner
moon. By Ashley Gerard Davies

The summer of 2020 will see three
spacecraft launch toward the Red
Planet, each one with distinct
objectives. By Emily Lakdawalla

52
OBSERVING
41

July's Sky at a Glance
By Diana Hannikainen

Lunar Almanac & Sky Chart

Binocular Highlight
By Mathew Wedel

4 Spectrum
By Peter Tyson

Planetary Almanac

6 From Our Readers

Under the Stars
By Fred Schaaf

7 75, 50 & 25 Years Ago
By Roger W. Sinnott

Sun, Moon & Planets
By Fred Schaaf

8 News Notes

30 Celebrating Hale-Bopp
A quarter of a century after its
discovery, this big, bright comet
remains vivid in memory.
By Ken Hewitt-White

Cover Story:
36 Catch a Moving Comet
Photographing these icy visitors
often requires a special approach.
By Gerald Rhemann

60 A Tourist's Guide to the
Summer Highlights
Roam the summer skies and revel
in this collection of ﬁne objects in
and around Sagittarius.
By Jerry Oltion

PHOTO: G ER A LD RHEM A NN

COLUMNS / DEPARTMENTS

NEAF Product Showcase

Celestial Calendar
By Bob King

Astronomer's Workbench
By Jerry Oltion

Exploring the Solar System
By Thomas A. Dobbins

Gallery

Deep-Sky Wonders
By Sue French
Going Deep
By Dave Tosteson

83 Event Calendar
84

Focal Point
By Paul Signorelli

ONLINE

BEGINNERS' GUIDE
Print out our free, 10-page handout
to give out at star parties and other
community events.
skyandtelescope.org/
getting-started
Comet Lovejoy
(C/2014 Q2) seen
from Austria in 2015

68 QHYCCD's QHY600M Camera
By Dennis di Cicco

ON THE COVER

S&T TEST REPORT

ONLINE STORE
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and other products made or chosen
by S&T's staff.
shopatsky.com

JOIN THE AAS
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member of the American Astronomical Society and help build pro-am
collaboration.
https://is.gd/aas_membership

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STEPHEN JA MES O'ME A R A

22 Three Missions Head
for Mars

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Sky & Telescope - July 2020

Table of Contents for the Digital Edition of Sky & Telescope - July 2020