Amateur astronomy magnitude

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In astronomy , limiting magnitude is the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument. In some cases, limiting magnitude refers to the upper threshold of detection. In more formal uses, limiting magnitude is specified along with the strength of the signal e. Sometimes limiting magnitude is qualified by the purpose of the instrument e. The International Dark-Sky Association has been vocal in championing the cause of reducing skyglow and light pollution. The limiting magnitude for naked eye visibility refers to the faintest stars that can be seen with the unaided eye near the zenith on clear moonless nights. The quantity is most often used as an overall indicator of sky brightness , in that light polluted and humid areas generally have brighter limiting magnitudes than remote desert or high altitude areas.
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In amateur astronomy, limiting magnitude refers to the faintest objects that can be viewed with a telescope. A two-inch. Star magnitudes do count backward, the result of an ancient fluke that stars of about 9th magnitude, a 6-inch amateur telescope will reach to.
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This page has a variety of suggestions for beginning amateur astronomers who wish to observe the sky with only the unaided eye. It is a common misconception that you need to have a telescope to do astronomy; this simply is not true. A wide variety of objects can be seen with the naked eye:
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Those Pesky Magnitudes … The system of designating stellar brightness by means of magnitude, in which brighter stars have numerically lower values, can seem arbitrary and counterintuitive to astronomy newcomers. However, understanding its origin may help to make it seem more logical. This crude classification was the genesis of the system that, with refinements, has come down to us.
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