MASON ASTR 111 - Advanced Questions (6 pages)

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Advanced Questions



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Advanced Questions

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Lecture Notes


Pages:
6
School:
George Mason University
Course:
Astr 111 - Introductory Astronomy: The Solar System
Introductory Astronomy: The Solar System Documents

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Astronomy Picture of the Day 2007 Oct 21 Will the Universe End in a Big Rip Advanced Question Chap 6 Q34 in P155 Several groups of astronomers are making plans for large ground based telescopes a What would be the diffraction limited angular resolution of a telescope with a 40 meter objective mirror b b Suppose this telescope is placed atop Mauna Kea How will the actual angular resolution of the telescope compare to that of the 10 meter Keck 1 telescope Asumme that adapative optics is not used Advanced Question Chap 6 Q34 in P155 Answer a 40 meter objective mirror at 500 nm Using the formular of diffraction limited angular resolution 2 9 5 5 10 nm 10 m nm 2 5 105 2 5 105 D 40m 0 003 arc sec b 10 meter telescope the diffraction limited angular resolution will be 4 times poorer which is 0 012 arcsec The seeing at Mauna Kea is 0 5 arcsec Without adaptive optics removing the effect of astomspheric turbulance the 40 m does not preform better in terms of resolving power Nevertheless it is able to see deeper into space because of better light gathering power Advanced Question Chap 7 Q22 in P181 Mars has two small satellites Phobos and Deimos Phobos circles Mars once every 0 31891 day at an average altitude of 5890 km above the planet s surface The diameter of Mars is 6794 km Using this information calculate the mass and average density of Mars Advanced Question Chap 7 Q22 in P181 Answer Using the Newton s form of Kepler s third law 4 2 3 P a GM 2 The orbital size a 5980 6794 2 9377km 9 375 X 106 m The orbital period 0 31891 day 2 755 X 104 sec The mass 4 2 a 3 M 2 G P 4 3 14 2 9 375 106 3 11 6 67 10 2 755 10 4 2 6 43 10 23 kg Advanced Question Chap 7 Q22 in P181 Answer The density M M 4 3 V r 3 23 6 43 10 4 3 14 6794 103 2 3 3 3918 kg m 3



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