Sky ArchiveTonight

Predawn moon above the Scorpion’s Stinger on March 5

On the morning of Tuesday, March 5, 2013, the rather wide waning crescent moon helps you to locate the two “tail-end” stars of the constellation Scorpius the Scorpion. These two very noticeable stars – called Shaula and Lesath – are often shown on old star maps at the tip of the Scorpion’s Stinger.

Moon and Comet Panstarrs after sunset March 12

The stars at the end of the J-shaped Scorpion – Shaula and Lesath – mean raised tail and stinger, respectively, in Arabic, although there is some controversy over the origin of Lesath. It may originally have been a Greek word for foggy. Whatever. (Why are there so many Arabic star names? Observations by Arabic astronomers when European astronomy was in the Dark Ages resulted in many stars being given Arabic names.)

The constellation Scorpius and the Teapot asterism (to the left of Scorpius). This photo was taken on July 19, 2007, when the planet Jupiter was near the bright star Antares. Jupiter is now in front of the constellation Taurus. Photo Credit: Phliar

The Scorpion is a very noticeable constellation, one of the few that look like their namesakes. To Northern Hemisphere viewers, this pattern of stars appears to have a curved tail sweeping down toward the southern horizon. Antares (the Scorpion’s reddish heart) is the brightest star in Scorpius, but Shaula and Lesath are very noticeable, too, for being at the end of the curved tail pattern and for appearing so close together. You’ll spot them easily if you look outside – under the moon – Wednesday morning.

Shaula and Lesath are also called the Cat’s Eyes

Stories about Shaula and Lesath vary greatly. In some Polynesian legends these two stars were called Pipiri and Rehua, a brother-sister pair who, angry at their parents for some imagined unfairness, ran away to the sky where they are now stuck as stars. In reality, Shaula and Lesath are indeed slightly related to each other (and to many others) in that they are young, as stars go, and are of similar star type (B). They also may have been formed from the same interstellar cloud. They aren’t that close together, however. Shaula is 700 light years away, and Lesath about 520.

How far is a light-year?

March 5, 2013
Sky Archive

Like what you read?
Subscribe and receive daily news delivered to your inbox.

Your email address will only be used for EarthSky content. Privacy Policy
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

More from 

Larry Sessions

View All