2018年USAAAO长问题第2道

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Jingsong Guo（讨论 | 贡献）2020年3月9日 (一) 21:53的版本 （创建页面，内容为“==英文题目== 2. [15 pt] The star Sualocin ($$RA: 20h 39.6m, Dec: 15^{\circ} 54.7’$$, absolute magnitude: -0.4) is about 78 pc away from our solar system, and…”）
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英文题目

2. [15 pt] The star Sualocin ($$RA: 20h 39.6m, Dec: 15^{\circ} 54.7’$$, absolute magnitude: -0.4) is about 78 pc away from our solar system, and the star Rotanev ($$RA: 20h 37.5m, Dec: 14^{\circ} 35.7’$$, absolute magnitude: 1.6) is about 31 pc away. An alien astronomer is on a planet with Earth’s mass and radius orbiting Rotanev. The planet has a uniform albedo of 0.3.

(a) [4 pt] What is the angular distance between Sualocin and Rotanev?

(b) [3 pt] What is the distance between these stars in parsecs?

(c) [3 pt] On the alien’s planet, what is the angular separation in the sky between Sualocin and our Sun?

(d) [5 pt] How much greater is the flux received by the planet from Sualocin than that received from our Sun?

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