ASTA01H3 Study Guide - Midterm Guide: Memory Stick, Escape Velocity, Apsis
Document Summary
1 au = 150, 000, 000 km o: 1 ly = 63, 000 au. Distance = speed x time t = [7. 4x1011 m / 3x108 m/s] / 60. Apparent magnitude: the apparent brightness of a star as observed from earth: observed apparent brightness depends on intrinsic brightness and distance, magnitude 1 (brightest) -------------- magnitude 6 (faintest, example. Star 1 m1= -1. 5 while star 2 m2= 8. Star 2 is 39 times brighter than star 1. Intersection of celestial meridian and horizon defines n and s. Intersection of celestial equator and horizon defines e and w: elevation of daily path which is parallel to the celestial equator is known as declination ( ) Star rises when it comes above the horizon and sets when it"s below it. If declination of a star is larger than 90 latitude ( ), then that star never sets and always remains above the horizon = circumpolar star: example.
