21–40 of 41 results

Celestial News & Events

8th-magnitude Nova in Sagittarius

A nova in Sagittarius, discovered a few nights ago by a Japanese amateur, has become bright enough to see in binoculars.

Two For T

Explore the Night with Bob King

Is T CrB About to Blow its Top?

The recurrent nova T Coronae Borealis last made a splash just after World War II. Does its current restive state hint at an imminent outburst?

Celestial News & Events

Meet My Variable Friend SS Cygni

Get acquainted with SS Cygni, the sky's brightest cataclysmic variable star. It's guaranteed to keep you on your toes.

Celestial Objects to Observe

The Top 12 Naked-Eye Variable Stars

Lurking in the seemingly changeless constellations are a few inconstant stars that pulse and eclipse. Here are a dozen variables that are easy to observe.

Variable Stars

Epsilon Aurigae's Eclipse Begins

Robin Leadbeater of Wigton, UK, has reported the first sign of the long-awaited eclipse of Epsilon Aurigae, one of the most remarkable eclipsing variable stars in the sky.

Variable Stars

Beta Lyrae

Beta Lyrae, an eclipsing binary, is one of the brightest and easiest-to-find variable stars in the sky.

Celestial Objects to Observe

Chi Cygni's Record-Breaking Maximum

The red, Mira-type variable star Chi Cygni has had a very unusual maximum. It's one of the brightest such variables to begin with (typically peaking at about magnitude 5.2), but in late July and early August 2006, it peaked at about magnitude 3.8.

Variable Stars

Chi Cygni: A Wide-Ranging Variable

This red long-period variable is sometimes visible to the unaided eye — and sometimes invisible even in a 4-inch telescope.

Hipparcos satellite

Variable Stars

Mining Hipparcos's Buried Treasure

The satellite caught tantalizing pieces of light curves for many new variable stars. Now it's time to fill in the details.

Variable Stars

Nova Hunters

Few observers have spotted an ever-elusive "new" star. Fewer still have done it twice. Observing styles and techniques are as varied as the searchers themselves.

Binary star artwork

Variable Stars

A Treasure-Trove of Variable Stars

Some of the Hipparcos satellite's unfinished business provides fair game for backyard observers.

Variable Stars

The Minima of Algol

Now you can calculate the dates and times (local and Universal Times) when the eclipsing variable star Algol should be at its dimmest (magnitude 3.4 instead of its usual 2.1).

The constellation Leo

Celestial Objects to Observe

The Lure of Variable Stars

Studying and recording the ups and downs of variable stars is a pleasant pastime that can also be scientifically rewarding. Here's a simple project to get you going.

Celestial Objects to Observe

R and T Coronae Borealis: Two Stellar Opposites

One is usually bright but fades unexpectedly; one is almost always faint but brightens unexpectedly. Check them out with binoculars.

Celestial Objects to Observe

Delta Scorpii Still Showing Off

For the fourth summer in a row, the head of the bright constellation Scorpius looks a little unusual.

Variable Stars

X Sagittarii: A Variable Star Toward Our Galaxy's Heart

This naked-eye variable should be near peak brightness every Wednes-day night during August, September, and October.

Variable Stars

Chi Cygni Rises Toward Maximum

Catch a orange-red variable star in Cygnus, the Swan, as its brightness peaks in early July.

Variable Stars

The Variable Star T Cephei

The long-period variable star T Cephei peaks this October. The star is relatively easy to locate in binoculars because of its red hue.

Celestial Objects to Observe

An 11th-Magnitude Supernova

An unusually bright supernova has gone off in NGC 2403, an 8.5-magnitude galaxy in the constellation Camelopardalis, the Giraffe.

Variable Stars

A Star Prepares to Blow Its Top

Easily found with the naked eye, 4th-magnitude Rho Cassiopeiae may be getting ready for an enormous mass ejection in the next few months.

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