ASTR 101 - Ch 1 & 2 Notes
ASTR 101 - Ch 1 & 2 Notes Astronomy 101
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This 2 page Class Notes was uploaded by None on Wednesday September 2, 2015. The Class Notes belongs to Astronomy 101 at California State University - Fullerton taught by Dr. Patricia Cheng in Summer 2015. Since its upload, it has received 171 views. For similar materials see Introduction to Astronomy in Astronomy at California State University - Fullerton.
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Date Created: 09/02/15
Chapter 1 Where Are You How to talk about huge astronomical distances 0 Number Unit 0 Avoid large numbers beyond imagination by defining other new distance units 0 1 Astronomical Unit AU Average distance bw Sun amp Earth gt Perihelion point on its orbit when the Earth is closets to Sun gt Aphelion point on its orbit when Earth is farthest from Sun gt 098AU 102AU2 1 AU 0 The length of time that has passed since the light we observe today left the objects gt Moon 1 sec Sun 8 min gt 1 light year ly distance traveled by light in 1 yr gt Speed of light C 3x108 ms 3x10A5 kms Chapter 2 The Stars Constellations one of stellar patterns identified by name usually by mythological Gods people animals or objects 0 88 constellations Names of Stars 0 Stars named by Greek letter alpha 1 beta 8 gamma y according to relative brightness within given constellation possessive form of name of constellation How to Compare Brightness of Stars 0 quotApparentquot brightness versus quotabsolutequot brightness gt Apparent brightness brightness that a light source appears to an observer depends on light source39s absolute brightness amp its distance to observer 0 Use apparent magnitude or intensity to specify star39s apparent brightness gt Larger magnitude gt fainter object gt Magnitude scale system can be extended towards negative s very bright gt Apparent visual magnitude mv includes only light that human eyes can see 0 Intensity l measure of light energy from a star that hits 1 square meter in 1 sec a measure of light source39s quotapparent brightnessquot gt Ex Star A has apparent visual magnitude of 63 amp star B has apparent visual magnitude of 53 a Which star appears to be brighter StarB b Which star39s intensity is lower StarA c Which star is closer to us NA absolute brightness unknown The Sky amp Celestial Moon Celestial sphere imaginary sphere surrounding Earth w stars stuck on inside gt celestial equator extension of Earth39s equator an imaginary circle divides Earth39s northern amp southern hemispheres out into space Celestial Sphere System Earth39s Coordinate System 0 Right Ascension 0 24 hrs Longitude E 0 gt 180 amp W 0 gt 180 o Declination 0 gt 90 or 0 gt 90 Latitude 0 gt 90 amp 0 gt 90 o Celestial Equator Earth Equator o Celestial North Pole Earth North Pole 0 Celestial South Pole Earth South Pole
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