September Skies, Vesto Slipher, and N.I.N.A.
In the September 2023 issue of Sky & Telescope, learn about the radio array built with off-the-shelf parts — including some from a baking company. But don’t let its simple design fool you: DSA-2000 will offer a sharp-eyed view of the radio sky. First results are expected in 2027; while you wait, dive into the past. Edwin Hubble discovered the expanding universe 20 years ago, in 1923, but the galaxy data he obtained from fellow astronomer Vesto Slipher was key to his realizations. Read Slipher’s side of the story. Then learn more about one of the key variable stars in Andromeda that was instrumental to Hubble’s discovery. With a big enough telescope, you can see it for yourself! Also in this issue, learn about the open-source software named N.I.N.A., which you can use to guide your astrophotography equipment, and find out how watching stars blink out has helped astronomers map asteroids from across the solar system.
FEATURE ARTICLES:
DSA-2000: Mining the Radio Sky
An ambitious observatory is taking shape in the American Southwest.
By Govert Schilling
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 Doughlas MacDougal
Edwin Hubble’s 1923 insight upended our understanding of the universe.
By Dave Tosteson
This powerful software controls your imaging equipment while you enjoy the night sky.
By Ron Breacher
Using backyard telescopes and teamwork, observers can discover details about small objects across the solar system.
By Marc Buie
September Ramble Through the Milky Way
Grab your favorite binoculars and get up close with late-summer targets.
By Mathew Wedel
Beyond the Printed Page:
Explore this detailed chart of the targets from Mathew Wedel’s “September Ramble Through the Milky Way.”
Visit the International Occultation Timing Association’s website.
Assist the Lucy Asteroid Ambassadors study asteroids.
ALSO IN THIS ISSUE:
The starry Dolphin frolics in the shallows of the Summer Milky Way.
By Fred Schaaf
An icy visitor pays a return visit this month to delight telescope users.
By Bob King
Do recent observations herald the return of ring spokes?
By Thomas A. Dobbins and William Sheehan
The eastern wing of the Swan is feathered with deep-sky delights.
By Ken Hewitt-White
Table of Contents
See what else September’s issue has to offer.
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