# homework3 - Astronomy 362 Problem Set#2 Due Friday January...

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Astronomy 362 Problem Set #2 Due Friday, January 31 at 12 noon In the homework problems below, “C&O” refers to your textbook. I have selected the problems with the expectation that they will take up to 1 hour of hard thinking/calculating each. If you are taking longer than this, feel free to come by my office to hash out where you are stuck. Note on collaborating: You may work together on this problem set, but all work presented here must be your own. You must clearly acknowledge any people you collaborated with. ASSUMED READING: Please finish C&O Chapter 3 (if you haven’t already) and read Chapters 5 sections 1 through 4 before Friday, January 31. 1. [C&O 3.5 (tweaked)] Some parallax questions a. The Hipparcos Space Astrometry Mission was able to measure parallax angles down to nearly 0.001". To get a sense of that level of resolution, how far from a dime would you need to be to observe it subtending an angle of 0.001"? (The diameter of a dime is approximately 1.9 cm.) b. Ten microarcseconds is the estimated angular resolution of GAIA, ESA’s recently launched astrometric mission. How far away would that dime need to subtend this small of an angle? Compare this to the distance to some object. 2. On January 21, 2014, a fairly bright Type- Ia (white-dwarf deflagration) supernova was discovered in the galaxy M82, in Ursa Major (Discovery image shown here is credited to UCL/University of London Observatory/Steve Fossey/Ben Cooke/Guy Pollack/Matthew Wilde/Thomas Wright).

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