Bright star near moon on May 16 is Spica
Comment Print Me Email to FriendTonight's Sky for Friday, May 16 2008
The waxing gibbous moon glides past the star Spica in the constellation Virgo this evening. It passes relatively close to Spica during every month that Spica is visible in our night sky. It does the same with other bright stars such as Regulus in the constellation Leo, Antares in the constellation Scorpius and Aldebaran in the constellation Taurus.
But have you ever heard of the moon near Polaris the North Star? If someone tells you they saw the moon near Polaris, you’ll know that can’t be so. The moon has a set path in the sky, approximately the same path as that followed by the sun each day. Polaris is far to the north on the sky’s dome, in a part of the sky the moon never visits.
In reality, the moon’s nearness to Spica tonight is just a line-of-sight_ illusion. The moon never gets close to Spica in a true sense because the moon is only about one light-second from Earth, while Spica is 260 light-years away.
Spica is the 15th or 16th brightest star in the sky (as it is neck-and-neck with Antares). It’s a close double star, and both stars in the Spica system are much hotter and brighter than our sun. In fact, there is some evidence that there are as many as three smaller, fainter stars in the Spica system.
