Sky & Telescope - September 2023 - 2

CONTENTS
THE ESSENTIAL GUIDE TO ASTRONOMY
FEATURES
14 DSA-2000: Mining the
Radio Sky
An ambitious observatory is taking
shape in the American Southwest.
By Govert Schilling
20 Vesto Slipher's Fast Stars
and Hotrod Galaxies
How one astronomer's historic
discovery of galactic redshifts
helped pave the way for modern
cosmology. By Douglas MacDougal
26 Hubble's Eureka Moment
Edwin Hubble's 1923 insight
upended our understanding of the
universe. By Dave Tosteson
28 Automation with N.I.N.A.
This powerful software controls
your imaging equipment while you
enjoy the night sky. By Ron Brecher
34 Shadow Chasers
Using backyard telescopes and
teamwork, observers can discover
details about small objects across
the solar system. By Marc Buie
Cover Story:
58 September Ramble
Through the Milky Way
Grab your favorite binoculars and
get up close with late-summer
targets. By Mathew Wedel
ON THE COVER
ONLINE
STARGAZER'S CORNER
Enjoy reader stories of adventures in
astrophotography, eclipse-chasing,
deep-sky marathons, and more!
skyandtelescope.org/
stargazers-corner
The planetary nebula
M27 shimmers in
Vulpecula
PHOTO: RON BRECHER
2
INTERACTIVE SKY CHART
Find out what the sky looks like for
your time and place. You can also
print the chart as a handout.
skyandtelescope.org/
interactive-sky-chart
DIGITAL EDITION
Use the email connected to
your subscription to read
our latest digital edition.
skyandtelescope.org/
digital
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IL, 60069-9806. Printed in the USA. Sky & Telescope maintains a strict policy of editorial independence from the AAS and its research publications in reporting on astronomy.
SEPTEMBER 2023 * SKY & TELESCOPE
MARCH 2018 * SKY & TELESCOPE
14
OBSERVING
41 September's Sky at a Glance
By Diana Hannikainen
42 Lunar Almanac & Sky Chart
43 Binocular Highlight
By Mathew Wedel
44 Planetary Almanac
45 Evenings with the Stars
By Fred Schaaf
46 Sun, Moon & Planets
By Gary Seronik
48 Celestial Calendar
By Bob King
52 Exploring the Solar System
By Thomas A. Dobbins &
William Sheehan
54 Suburban Stargazer
By Ken Hewitt-White
S&T TEST REPORT
66 Askar's V Scope
By Alan Dyer
COLUMNS / DEPARTMENTS
4 Spectrum
By Peter Tyson
6 From Our Readers
7 75, 50 & 25 Years Ago
By Roger W. Sinnott
8 News Notes
12 Cosmic Relief
By David Grinspoon
71 New Product Showcase
72 Astronomer's Workbench
By Jerry Oltion
74 Beginner's Space
By Monica Young
76 Gallery
83 Event Calendar
84 Focal Point
By John Rummel
September 2023
VOL. 146, NO. 3
CALTECH / DSA TEAM

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Sky & Telescope - September 2023

Table of Contents for the Digital Edition of Sky & Telescope - September 2023