Death of Stars II Physics 113 Goderya Chapter(s): 14 Learning Outcomes:
Stars and Constellations Physics 113 Goderya Chapter(s): 2 Learning Outcome:
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Transcript of Stars and Constellations Physics 113 Goderya Chapter(s): 2 Learning Outcome:
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Stars and ConstellationsPhysics 113 Goderya
Chapter(s): 2Learning Outcome:
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Constellations
In ancient times, constellations only referred to the brightest stars that appeared to form
groups, representing mythological figures.
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Finding objects in the sky
• Constellations
Source: Jodrell Bank Observatory
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Finding objects in the sky
• Orion Nebula
Source: Jodrell Bank Observatory
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Constellations (2)
Today, constellations are well-defined regions on the sky, irrespective of the presence or absence of bright stars in those regions.
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Apparent viewThe stars of a constellation only appear to be close to one another
Usually, this is only a projection effect.
The stars of a constellation may be located at very different distances from us.
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Star NamesStars are named by a Greek letter () according to their relative brightness within a given constellation + the possessive form of the name of the constellation:
OrionBetelgeuze
Rigel
Betelgeuse = OrionisRigel = Orionis
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Circumpolar Constellations
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Non Circumpolar Constellations
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Constellation of the ZodiacDue to Earth’s revolution around the sun, the sun appears to move through the zodiacal constellations.
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Constellations from Different Places
(SLIDESHOW MODE ONLY)
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Stellariumhttp://www.stellarium.org
Go download it if you have a computer at home. Its Free
Source: Jodrell Bank Observatory Screen from STELLARIUM (A freeware software)
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Angles in Astronomy
• Angles– Circle = 360º =2π radians– Two Perpendicular lines = 90º– 1º = 60 ‘ (arc minutes)– 1‘ = 60 " (arc seconds)– 1 radian = 360x60x60/2π = 206265 "– Sun & Moon Diameter = 0.5º = 30 “– Extended fist = 5º
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Angles in Astronomy
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Small Angle Formula
distance
diameterlinear
5206,26
diameterangular
km 384,000
km 3476
5206,26
diameterangular
5.06060
18700187diameterangular
Example for Moon