Revised estimate of near-Earth asteroids


Bulletin at a Glance

This Week’s Sky at a Glance

A WISE Assessment of Near-Earth Asteroids

September 30, 2011 | A heat-sensing NASA spacecraft finds that there aren’t nearly as many large and midsize asteroids hovering near Earth as astronomers thought. Now we can all sleep a little easier. > read more

Planet Hunters are Losing Count

September 25, 2011 | The latest 500 planet candidates from the Kepler mission are just part of the story. But Terra II remains elusive. > read more

Sky & Telescope November 2011

September 29, 2011 | Sky & Telescope‘s November 2011 issue is now available to digital subscribers. > read more

Sue French’s New Book

September 2, 2011 | Deep-Sky Wonders, the new book by Sue French, is now available for pre-order. > read more


Sky chart for Mira


Observe Mira, the Amazing Star

September 28, 2011 | The extraordinary variable star Mira is expected to peak in early October, 2011. > read more

M101’s Supernova Shines On

September 16, 2011 | As of September 30th the supernova in the galaxy M101 was down to about magnitude 10.9, gradually fading from its mid-September peak of magnitude 9.9. It’s getting redder too. > read more

Tour October’s Sky by Eye and Ear!

September 30, 2011 | This is a month of transition: Northern summer becomes autumn, Saturn sets just before Jupiter rises, and Venus is moving from the morning sky before dawn to the evening sky. > read more

Jupiter: Big, Bright, and Beautiful

September 23, 2011 | The “King of Planets,” which will dominate the evening sky from late 2011 through early 2012, is a captivating sight no matter how you look at it. > read more

Trusty Comet Garradd

September 1, 2011 | Comet C/2009 P1 Garradd is shining at 7th or maybe even 6th magnitude as it traverses southeastern Hercules. > read more

Ceres and Vesta in 2011

September 8, 2011 | The two brightest asteroids are in fine view for binoculars or a telescope. Here are instructions and charts to find them. > read more

Uranus and Neptune in 2011

May 31, 2011 | Uranus and Neptune are easy to find with the aid of the charts in this article. > read more

This Week’s Sky at a Glance

Twilight view

This Week’s Sky at a Glance

September 30, 2011 | The waxing Moon returns to the evening sky. The supernova in M101 is reddening now as well as fading. And there’s always action at Jupiter. > read more


Participants in the Planet Hunters project have made about 4 million light curve classifications with the Q1 and Q2 data from the Kepler Mission.

Michael Marsland / Yale University

Citizen Scientists Track Down New Planets

September 29, 2011 | Using data gathered by the Kepler Space Telescope, a legion of amateur planet-hunting volunteers have perhaps uncovered the existence of two alien worlds. > read more

Let the Star Parties Begin!

April 14, 2011 | Want to gaze at the Milky Way all night or peer into the eyepiece of a 12-inch telescope? Escape the city lights and head for the nearest big amateur nighttime gathering. > read more

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