Saturn's moon Rhea will hide a seventh magnitude star for viewers in eastern North America on the evening of September 12, 2014 local time. Continue reading →
¡SkyCaramba! Weekly astronomy blog for the week ending September 13, 2014
One of Saturn’s moons is about to hide a star in Libra. Saturn is a naked eye object. Its moon Rhea and the star Rhea will cover on the evening of September 12th are not. But a small telescope, the right location, and clear enough weather will enable you to see the star “wink out”.
Rhea is the ringed planet’s second largest moon. It’s made mostly of water ice and there’s a little rock in the mix too. Even though the moon orbits Saturn, it’s named for a daughter of the sky god Uranus. Giovanni Cassini is the first person known to see Rhea in late 1672.
Rhea is marked with lots of craters. It has a very thin atmosphere of mostly oxygen with some carbon dioxide. And it orbits Saturn in just four-and-a-half days.
The star Rhea will hide for almost a full minute is a white star about 306 light years away. It shines at seventh magnitude, about three magnitudes ...