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Unformatted text preview: AST 3722C - Spring 2008 Homework #6 – Due before class March 18 Instructions: Solve each part of each problem below. Where math is involved, and unless otherwise indicated, show your work. • 1. (2 points.) One day you decide to observe a comet that is passing Δ = 0 . 8 AU away from the center of Earth. To make it easy, you’ll observe the comet when it is transiting. You look up the ephemeris and see that its J2000 coordinates at the time of transit are α = 05 h 10 m 20 s , δ = 20 ◦ 30 00 00 . However this is the position for a hypothetical person standing at the center of Earth. (a) Calculate the distance Δ to the comet from your location on the surface of Earth at latitude φ = 28 . 6 ◦ . Assume that the radius of Earth is 6378 km, and that 1 AU is 149,597,871 km. (b) Calculate the apparent declination δ app of the comet when you observe it from your location. (c) The time it would take for a photon to travel from the comet to the center of Earth would be Δ /c . How much less time does it take for a photon from the comet to get to you?....
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This note was uploaded on 11/09/2009 for the course AST 4700 taught by Professor Fernandez during the Spring '09 term at University of Central Florida.
- Spring '09