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stars Parallax and Magnitude
2p 1AU 1AU 61Cygni To distant star p p
[object Object],[object Object],[object Object]
[object Object],[object Object]
61 Cygni is 0.3 seconds of arc ,[object Object],[object Object],[object Object]
Consider a star 1 parsec from Earth
1AU CIRCUMFERENCE=60 X 60 X 360 AU
1 PARSEC CIRCUMFERENCE = 2 π  parsec
[object Object],[object Object]
[object Object],[object Object]
About 11 Light Years away
Looking   At Brightness ,[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object]
Ancient Greeks   ,[object Object],[object Object]
19 th  CENTURY LIGHT from a magnitude 1 star was  100 times brighter than from a magnitude 6 star.
[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
PROBLEMS ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
ABSOLUTE MAGNITUDE ,[object Object]
[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
Sirius ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object],[object Object]
 

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Stars