09/17/2012 – Ephemeris – Cygnus and the search for exo-planets
Ephemeris for Monday, September 17th. The sun will rise at 7:24. It’ll be up for 12 hours and 24 minutes, setting at 7:48. The moon, 2 days past new, will set at 8:21 this evening.
Nearly overhead at 10 p..m. is the constellation Cygnus the swan. The bright star Deneb is at the tail of this flying swan with its wings outstretched, flying south through the Milky Way. Cygnus is located at a point in the Milky Way in the direction the sun’s orbiting the center of the Milky Way. That is the approximate direction the Kepler spacecraft is staring. Launched in 2009 the Kepler spacecraft has been slowly drifting away from the earth in a trailing orbit of the sun. It is monitoring over 100,000 stars continuously looking for transits of planets across their stars. So far some 2300 suspects have been found. They have to be confirmed by ground based telescopes before being officially cataloged. So far close in planets to their stars have been discovered.
Addendum
Kepler Spacecraft. Credit NASA.
Click image to enlarge.
Kepler field of view. Credit C. Roberts, NASA.
Click image to enlarge.
Link to Kepler’s home page: http://kepler.nasa.gov/
Bob Moler's Ephemeris Blog 
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