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1.Luminosity is the amount of light emitted from a certain light source whereas brightness is the amount of light manifested or received.

2.The area of illumination is inversely proportional to brightness whereas luminosity isn't.

3.Brightness is usually expressed in 'Lumens' whereas luminosity is expressed in candela per square meter (photometry).

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βˆ™ 12y ago
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βˆ™ 9y ago

The difference between apparent brightness and luminosity is that apparent brightness means that a star may appear to be bright, but only looks bright because of the relatively closeness a star is to earth. Luminosity is used by astronomers and refers to the power output of a star.

Apparent Brightness means a star may appear to be very bright but only look that way because it is relatively close to Earth. Luminosity just refers to the power output of a star.

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βˆ™ 14y ago

No, luminosity is how bright an object is in total while apparent magnitude is how bright we perceive it here on Earth. Apparent magnitude is most often lower than the absolute magnitude (true luminosity) of an object due to our atmosphere and interstellar dust.

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βˆ™ 11y ago

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.

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βˆ™ 13y ago

The total amount of light that the star radiates each second.

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βˆ™ 13y ago

Amount of energy produced against the distace from the observer.

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βˆ™ 11y ago

Luminosity is really the same as apparent magnitude.

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βˆ™ 8y ago

absolute magnitude is how bright the star actually is and luminosity is how bright it looks.

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βˆ™ 14y ago

Brightness of the star

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βˆ™ 11y ago

How much light the thing emits.

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Q: What luminosity measure that different from what absolute visual magnitude measures?
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What is the name of the amount of light a star gives off?

The amount of light a star gives off is the intensity or luminosity. Absolute Magnitude measures the amount of light given off.


What is the luminosity of the star regulus?

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.


Why is the absolute magnitude of some stars greater their apparent magnitude?

The apparent magnitude is how bright the star appears to us, but stars are all at different distances so that a star that is really bright might look dim because it is very far away. So the absolute magnitude measures how bright the star would look if it was placed at a standard distance of 10 parsecs. When the absolute magnitude is greater than the apparent magnitude, it just means that it is closer than 10 pc. The brightest stars have absolute magnitudes around -7.


What are the x and y axis of the h-r diagram?

There are several equivalent versions of the Hertzspung-Russell diagrams of stars. The horizontal axis is either the surface temperature (increasing to the left). The vertical axis measures the luminosity (increasing upwards) or absolute magnitude (increasing downwards).


The Richter scale measures magnitude or intensity?

Magnitude


What body in space is the most luminous star?

The most luminous star in space is named R136a1 which is 160,000 light years away from space. It measures absolute bolometric magnitude of -12.6 , and an apparent visible magnitude of 12.84.


Difference between intensity and magnitude?

Magnitude is a measure of the energy released by the earthquake - it is an absolute value and does not vary with where it is measured. Intensity measures the strength of the shaking at a particular location and will vary with distance, substrate conditions and other factors. It is a subjective measure which depends on observation, not measurement. The reference below sets it all out for you.Is also an answer but here's another answer:This is my answer:D(Magnitude / Intensity Comparison)(Magnitude and Intensity measure different characteristics of earthquakes. Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs while Intensity measures the strength of shaking produced by the earthquake at a certain location. Intensity is determined from effects on people, human structures, and the natural environment.)


What is the difference between magnitude and direction?

Magnitude measures size while direction measures geolocation


What part of a star measures magnitude?

Magnitude refers to a star's brightness.


Give two reasons why the stellar magnitude might be confusing?

You have two main categories of magnitude. Apparent magnitude is how bright a star appears to be when we look at it. Different stars appear to have different levels of brightness. However all of the stars are different distances away. So a very bright star might be so far away that it looks very faint while a star that is not actually as bright as it appears far brighter because it is much nearer to us. Absolute magnitude measures the real brightness of stars, or how bright they would be if they were all the same distance from us.


Why does Arcturus star have greater absolute magnitude than the sun buy a much lower apparent magnitude?

The apparent magnitude is how bright the star appears to us, but stars are all at different distances so that a star that is really bright might look dim because it is very far away. So the absolute magnitude measures how bright the star would look if it was placed at a standard distance of 10 parsecs. When the absolute magnitude is greater than the apparent magnitude, it just means that it is closer than 10 pc. The brightest stars have absolute magnitudes around -7.


What is the brightness of the star called?

Absolute magnitude and apparent magnitude. Absolute magnitude is how bright the star actually is. Apparent magnitude is how bright the star appears from a given vantage point. It depends on the star's absolute magnitude and how far away it is.