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“magnitudes”
A measure of the brightness or luminosity of a star or other celestial object: The larger the number referring to the magnitude, the fainter the object.
Zero, or first magnitude, indicates some of the brightest stars.
Still brighter are those of negative magnitude, such as Sirius, whose magnitude is -1.46.
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Astronomy and related astronomical terms
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“magnitudes”
(mathematics is the deductive study of quantities, magnitudes, and shapes as determined by the use of numbers and symbols while every branch of science and engineering depends on mathematics; measurement is the process of associating numbers with physical quantities and phenomena and measurement is fundamental to the sciences; to engineering, construction, and other technical fields; and to almost all everyday activities)
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“magnitudes”
The magnitude a celestial object would appear to have if it were at a distance of ten parsecs (10 times 3.261633 light years or 32.62 parsecs): The absolute magnitude is the measure of the true or intrinsic brightness of a star as if all stars were the same distance (32.6 light-years) from the observer.
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Astronomy and related astronomical terms
(page 1)
The absolute magnitude of an object measured through a special yellowish filter that approximates the visual range of the human eye: For stars, a normally cited absolute magnitude is the absolute visual magnitude that uses the visual (V) band of the spectrum.
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Astronomy and related astronomical terms
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A numerical assessment of the brightness of a heavenly body: An apparent is the intensity of light of a star as seen from the planet Earth.
3. An apparent is the numeric calculation of the luminosity of stars as they appear on the celestial sphere.
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Astronomy and related astronomical terms
(page 2)