AST 1A INTRODUCTION to the SOLAR SYSTEM Fall 2016 1 CH 2 Vocabulary ALL (DUE 2/23) Constellation Asterism Magnitude Scale Ap

Home , Alpha Pegasi, Alpha Telescopii, Epsilon Ursae Majoris

AST 1A INTRODUCTION TO THE SOLAR SYSTEM Fall 2016 CH 2

Vocabulary ALL (DUE 2/23) constellation asterism magnitude scale apparent visual magnitude, mv flux celestial sphere scientific model north celestial pole south celestial pole horizon north point south point east point west point zenith nadir celestial equator angular distance arc minute arc second angular diameter circumpolar constellation precession rotation revolution ecliptic vernal equinox summer solstice autumnal equinox winter solstice perihelion aphelion evening star morning star zodiac horoscope pseudoscience scientific argument

1 AST 1A INTRODUCTION TO THE SOLAR SYSTEM Fall 2016 Review Questions 1-3, 10-12 (DUE 2/28)

1. Why are most modern constellations composed of faint stars or located in the southern sky?

2. How does the Greek-letter designation of a star give you clues both to its location and its brightness?

3. From your knowledge of star names and constellations, which of the following stars in each pair is the brighter? Explain your answers. a. Alpha Ursae Majoris; Epsilon Ursae Majoris b. Epsilon Scorpii; Alpha Pegasi c. Alpha Telescopii; Alpha Orionis

10. Why does the number of circumpolar constellations depend on the latitude of the observer?

11. Explain the two reasons why winter days are colder than summer days.

12. How do the seasons in Earth’s southern hemisphere differ from those in the northern hemisphere?

Problems 2-4, 7 (DUE 2/28)

2. If one star is 6.3 times brighter than another star, how many magnitudes brighter is it?

3. If light from one star is 40 times brighter (has 40 times more flux) than light from another star, what is their difference in magnitude?

4. If two stars differ by 7 magnitudes, what is their intensity ratio?

7. By what factor is the sun brighter than the full moon? (Hint: See Figure 2-6, though this may be numbered differently, depending on the edition of your book.)