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Sierra Sky Calendar for the period beginning Friday, December 14, 2007 by Jim Kaler
One of the greatest things about living in the Sierra Nevada mountains is the ability to look up and and see the stars and planets on a clear night. The other is having author and astronomer Jim Kaler as your personal night sky guide, pointing out what's up, each and every week. Check it out!
Astronomy Picture of the Week:
Mars in View
Credit & Copyright: Jean-Luc Dauvergne, Francois Colas
Explanation: Very good telescopic views of Mars can be expected in the coming weeks as the Red Planet nears opposition on December 24th. Of course, opposition means opposite the Sun in planet Earth's sky - an arrangement that occurs every 26 months for Mars. Because of Mars' more elliptical orbit, the actual date of closest approach to Earth will be December 18, when Mars will be within about 88 million kilometers of our fair planet. Situated in the constellation Gemini and rising after evening twilight, the bright, ruddy disk of Mars will reach nearly 16 arcseconds in diameter (about 1/100th the diameter of the Full Moon). In this already exceptional image taken on November 18, north is down and surface markings around the sprawling, dark, albedo feature Syrtis Major are remarkably clear. The image was recorded with a video camera and filters on a 1 meter telescope at Pic Du Midi, a mountain top observatory in the French Pyrenees. Taking advantage of the shorter travel distance near opposition, NASA launched the Phoenix lander to Mars in August, scheduled to arrive in May 2008.
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