2018年USAAAO长问题第2道
来自astro-init
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?
