Did you know there are as many asteroids hugging Jupiter in its orbit as there are in the asteroid belt? Astronomer Scott Sheppard sheds light on these so-called Trojans, the dark-red rocks that circle the Sun at gravitationally stable regions ahead and behind Jupiter, Neptune, and even Earth. Then engineer Robert Dick sheds another kind of light when he asks, are red LED lights really the best for observing? The answer, which may surprise you, is already being implemented in Canada's Dark-Sky Preserves. Read on for observing inspiration: spy galaxies in Virgo, find the Moon's smaller craters, explore the Trifid Nebula, see Saturn at opposition, and spot Mars's hard-to-see moons, among many other observing adventures this month.
Dancing with Planets
Millions of Trojan asteroids exist in gravitational "sweet spots" that hold important keys to our solar system's history.
By Scott S. Shepard
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
The Elusive B Cassiopeiae
Track and capture this supernova remnant with the author.
By David Tosteson
Leo by Night, Lions by Day
Travels to the heart of Africa's national parks for an observing adventure of a lifetime.
By Nick Howes
The Nebula War
A clash between two pioneer sky photographers deepened the growing split between amateur and professional astronomy.
By Alan Hirshfield
Beyond the Printed Page
Catch up on scientific results from this star-forming cloud with these references.
Want to see the sky — and the world? Sky & Telescope offers tours to see Northern Lights, eclipses, and more.
WFIRST: The Hubble of the Future
Watch a recent Google Hangout with some of the mission’s key players.
Librations and other lunar data for June 2016.
ALSO IN THIS ISSUE
Three Planet Night
Jupiter, Saturn, and Mars shine in the dark, Mercury peeks up at dawn.
By Fred Schaaf
Hunt the Moons of Mars
With Mars now big and close, try for Phobos and Deimos.
By Alan MacRobert
Grab hold of these galactic wisps in Virgo.
By Sue French
S&T Test Report: Sky-Watcher's Dual-Purpose Mount
This mount offers versatility for both astrophotography and observing.
By Alan Dyer
Table of Contents
See what else June's issue has to offer.