Sun, Jul 05, 2009

Caliente

Sky Spy : It's a good time to follow the moon

By Tim Hunter
special to the arizona daily star
Tucson, Arizona | Published: 01.15.2009
The moon is beautiful no matter its phase or the condition of the sky. Even if it is hidden by clouds, its light produces interesting effects.
Now is a good time to follow the moon for several days because it comes close to two important stars.
On Saturday, after 1 a.m., the waning (getting smaller) gibbous (more than half lit) 22-day-old moon will be just south of the bright star Spica.
I like Spica. It's bright and has a wonderful blue color.
Although we can see Spica in the middle of winter, it was called a harvest symbol by ancient cultures. The sun passes close to Spica in the sky in the fall.
In modern times Spica is more traditionally considered a late spring or early summer object, since it's visible in the early-evening sky.
You should also try to get up before sunrise on Wednesday morning. The moon will be far enough above the horizon by 5 a.m. to be easily visible.
The bright star Antares will be just above the upper edge of the 25-day-old waning crescent moon. The two will be so close that the moon will actually occult (hide) Antares as viewed from South America.
Antares is traditionally thought of as a summer object.
It is a red supergiant star far brighter and larger than the sun. But its nuclear fuels deep in its interior are nearly exhausted. Once they are gone — tomorrow or a million years from now — Antares will die with a massive supernova explosion.
It would be too far away to hurt us, but what a sight that will be.
Tim Hunter has been an amateur astronomer since grade school. Contact him at skyspy@azstarnet.com.