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Astronomy 1020-H Stellar Astronomy Spring_2016 Day-6 Course Announcements • Smartworks Chapter 1: Grades will be downloaded sometime this weekend. SW-2 … hop to it. 1st set of Dark Sky observing nights: • • • • Tues. Feb. 2 & Mon. Feb. 8 – 7:30pm at the observatory. Tues. Feb. 9 is the weather backup if both are cancelled. Lab This Week • • • • • Blackbody Curves and UBV Filters What you need to know: A Blackbody is a perfect emitter. Stars are NOT blackbodies. The Stefan-Boltzmann Law (Chapter 5): F = sT4 Position Is the horizon shown a real physical horizon, or an imaginary plane that extends from the observer and Earth out to the stars? Can the observer shown see an object located below the horizon? Celestial Sphere Rotation Star B 2 Star A 1 Celestial Sphere Celestial Sphere 3 1 4 Is there a star that is in an unobservable position? When a star travels from being below the observer’s horizon to being above the observer’s horizon, is that star rising or 2 3 4 Celestial Sphere Rotation Figure 2 Horizon Tutorial: Position – p.1 Work with a partner Read the instructions and questions carefully Talk to each other and discuss your answers with each another Come to a consensus answer you both agree on If you get stuck or are not sure of your answer ask another group If you get really stuck or don’t understand what the Lecture Tutorial is asking as one of us for help Colored Card Question In what direction is the observer facing? Celestial Sphere Rotation Star B 2 Star A 1 A) toward the South B) toward the North C) toward the East D) toward the West 2 Celestial Sphere Celestial Sphere 3 1 4 3 4 Celestial Sphere Rotation Figure 2 Horizon Colored Card Question Imagine that from your current location you observe a star rising directly in the east. When this star reaches its highest position above the horizon, where will it be? A. high in the northern sky B. high in the southern sky C. high in the western sky D. directly overhead Colored Card Question Where would the observer look to see the star indicated by the arrow? Star B 2 Star A 1 2 Celestial Sphere Celestial Sphere 3 1 4 A. High in the Northeast 3 B. High in the Southeast C. High in the Northwest 4 D. High in the Southwest Celestial Sphere Rotation Horizon I Realize this is Like Trying to Drink from a Fire Hose
