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Als Sterne 1. Größe werden seit der griech … Als Sterne 1. Größe werden seit der griechischen Antike die etwa 20 hellsten Fixsterne bezeichnet. In der von Pogson 1850 streng definierten Helligkeitsskala zählt man heute zur ersten Größe alle Sterne, die heller als +1,5 mag sind. Am gesamten Sternhimmel gibt es 22 Sterne 1. Größe, von denen 10 nördlich des Himmelsäquators und 12 südlich von ihm stehen. Besonders auffällig unter ihnen sind vier Sterngruppen:
* am Nordhimmel das Wintersechseck und das große Sommerdreieck
* am Südhimmel das Kreuz des Südens und der benachbarte Centaurus. des Südens und der benachbarte Centaurus.
, First-magnitude stars are the brightest st … First-magnitude stars are the brightest stars in the night sky, with apparent magnitudes lower (i.e. brighter) than +1.50. Hipparchus, in the 1st century B.C., introduced the magnitude scale. He allocated first magnitude to the 20 brightest stars and the sixth magnitude to the faintest stars visible to the naked eye. In the 19th Century, this ancient scale of apparent magnitude was logarithmically defined—so that a star of 1.00 mag is exactly 100 times brighter than a star of 6.00 magnitude. The scale also was extended to even brighter celestial bodies like Sirius (-1.5 mag), Venus (-4 mag), full Moon (-12.7 mag) and Sun (-26.7 mag).full Moon (-12.7 mag) and Sun (-26.7 mag).
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| rdfs:comment |
First-magnitude stars are the brightest st … First-magnitude stars are the brightest stars in the night sky, with apparent magnitudes lower (i.e. brighter) than +1.50. Hipparchus, in the 1st century B.C., introduced the magnitude scale. He allocated first magnitude to the 20 brightest stars and the sixth magnitude to the faintest stars visible to the naked eye.e faintest stars visible to the naked eye.
, Als Sterne 1. Größe werden seit der griech … Als Sterne 1. Größe werden seit der griechischen Antike die etwa 20 hellsten Fixsterne bezeichnet. In der von Pogson 1850 streng definierten Helligkeitsskala zählt man heute zur ersten Größe alle Sterne, die heller als +1,5 mag sind. Am gesamten Sternhimmel gibt es 22 Sterne 1. Größe, von denen 10 nördlich des Himmelsäquators und 12 südlich von ihm stehen. Besonders auffällig unter ihnen sind vier Sterngruppen:
* am Nordhimmel das Wintersechseck und das große Sommerdreieck
* am Südhimmel das Kreuz des Südens und der benachbarte Centaurus. des Südens und der benachbarte Centaurus.
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| rdfs:label |
Stern 1. Größe
, First-magnitude star
|
