STELLAR MAGNITUDE (2)
The absolute magnitude of a star is the magnitude I would have said star if it were located at a distance of 10 parsec (1 parsec is 3.2616 years = 3.0857 X10 light 16 m, ie the distance from which Earth and the Sun would seem to be separated by an angle of 1 arc second) .
The magnitude of the stars is now known through the photometers or photographically.
is the term applied to the first magnitude stars that range from + 0.6 to 1.5, the second magnitude of the stars of + 1.6 to + 2.5; third magnitude from + 2.6 to + 3.5, etc.
The number of stars visible to the naked eye is about 6,500, with 20 stars of 1 magnitude, about 60 of 2 nd magnitude star close to 200 3 rd magnitude approximately 600 4 th magnitude, about 1,600 stars 5 ยบ size and more than 4000 of 6 th magnitude. Assuming that the stars are distributed equally in the sky, an observer in an instant see about 3,000 stars.
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