Apparent magnitude - Wikipedia, the free encyclopedia
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The apparent magnitude ( m ) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere. The bri...
en.wikipedia.org/wiki/Apparent_magnitude
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Luminosity - Wikipedia, the free encyclopedia
Luminosity is a measurement of brightness usually denoted in Lumens. In photometry, luminosity is sometimes incorrectly used to refer to luminance, which is the density of luminous intensity in a g...
en.wikipedia.org/wiki/Luminosity
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Star Brightness Magnitude; Human Eye; Effect of Integration in StellaCam; ... The magnitude of stars (Wiki)is measured on a scale where a brightness difference of 100 is represented by a change in the Magnitude of 5. This system was developed in 1856 by N. R. Pogson and is called the Pogson Magnitude Scale.
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www.prc68.com/I/Mag.shtml
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Magnitude is a measure of the brightness of a star. "Apparent magnitude" or "visual magnitude" refers to the brightness of a star as seen from Earth. "Absolute magnitude" refers to the intrinsic brightness of a...
http://www.ancientsuns.com/faq/magnitude.html
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Both systems are logarithmic with a difference in magnitude of 5 being equivalent to a factor of 100 in brightness (NB small magnitudes correspond to bright stars). The absolute magnitude is directly related to the star's luminosity and the apparent magnitude can be measured here on Earth.
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www.ast.cam.ac.uk/~mjp/magnitude.html
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By the 19th century astronomers had developed the technology to objectively measure a star's brightness. Instead of abandoning the long-used magnitude system, astronomers refined it and quantified it. ... parallax value measured by Hipparcos (Spica's absolute magnitude of -3.546 was rounded to -3.55 in the table above).
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www.astronomynotes.com/starprop/s4.htm
www.astronomynotes.com/starprop/s4.htm
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For the longer star distances, indirect methods are used. The Cepheid variable technique is useful out to millions of light-years. Cepheids are a category of stars whose actual brightness is well known. If a Cepheid appears dim its ... Entire galaxies appear to be receding from the earth, as measured by their redshift.
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www.christiananswers.net/q-eden/star-distance.html
www.christiananswers.net/q-eden/star-distance.html
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We see three apparent star properties: position, brightness, and color. To understand a star, we must figure out its intrinsic properties from what we see. ... Moreover, we can measure the star's apparent brightness by looking at it. Now we're getting somewhere since we know both its real and apparent brightness. Bingo!
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www.wonderquest.com/star-distances-ii.htm
www.wonderquest.com/star-distances-ii.htm
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A Multimedia Tour of the Solar System: ... one star, eight planets, and more ... by Bill Arnett...
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