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In astronomy, Luminosity is the amount of energy a body radiates per unit time. The luminosity of stars is measured in two forms: apparent (counting visible light only) and bolometric (total radiant energy); a bolometer is an instrument that measures radiant energy over a wide band by absorption and measurement of heating. When not qualified, luminosity means bolometric luminosity, which is measured in the SI units watts, or in terms of solar luminosities, ; that is, how many times as much energy the object radiates than the Sun, whose luminosity is 3.846×1026 W. Luminosity is an intrinsic constant independent of distance, and is measured as absolute magnitude corresponding to apparent luminosity, or bolometric magnitude corresponding to bolometric luminosity. In contrast, apparent brightness is related to distance by an inverse square law. Visible brightness is usually measured by apparent magnitude, which is on a logarithmic scale. In measuring star brightnesses, visible luminosity (not total luminosity at all wave lengths), apparent magnitude (visible brightness), and distance are interrelated parameters. If you know two, you can determine the third. Since the sun's luminosity is the standard, comparing these parameters with the sun's apparent magnitude and distance is the easiest way to remember how to convert between them.

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Related Questions

What is the Regulus star?

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What is regulus star?

the color of the star regulus is blue-white


What color is the star regulus?

the color of the star regulus is blue-white


What color star is regulus?

the color of the star regulus is blue-white


What is the meaning of regulus the star?

Regulus is a star located in the constellation Leo. It is the brightest star in the constellation and one of the brightest stars in the night sky. The name "Regulus" is Latin for "prince" or "little king."


What color is Regulus?

Regulus is a class B2 star and will thus have a colour of blue white


In what constellation would you find the star named regulus?

The star Regulus, or Alpha Leonis, can be found in the constellation of Leo. It is the brightest star in the constellation.


How is star luminosity measured?

A star's luminosity is measured according to the relevance to the sun. Basically for example, if a star is 8,300 degrees Celsius and has a luminosity of 0.001; the luminosity is compared to the sun.


brightest star in Leo?

Regulus


What type is regulus?

Regulus is one of the brightest stars in the sky. In the constellation Leo, Regulus is actually a multiple star system of 4 stars.


Where is the star regulus?

Regulus is the brightest star in the constellation Leo and one of the brightest stars in the nighttime sky. It is about 77.5 light years from Earth.


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The main star in the Polaris system has a luminosity which is 2500 times that of the Sun.