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Answered 2008-05-21 18:17:26

Apparent Magnitude is the star's brightness as it appears from earth. absolute magnitude is the apparent brightness of a star if viewed from a distance of 32.6 light years away.

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Compare apparent magnitude and absolute magnitude?

Apparent Magnitude is the star's brightness as it appears from earth, while, Absolute Magnitude is the apparent brightness of a star if viewed from a distance of 32.6 light years away.


How does the brightness of a quasar compare with that of a large galaxy?

I assume when you mean brightness, you mean apparent magnitude as opposed to absolute magnitude. The quasar 3C 273 has an apparent magnitude of about 12.8 whereas the brightest galaxy - the Large Magellanic Cloud has an apparent magnitude of 0.9. However, in absolute magnitudes, 3C 273 has an absolute magnitude of about -26.7 very similar to our own Sun.


What two factors must be known when using cepheid variables to calculate astronomical distances?

For any object, you need to compare the real brightness ("absolute magnitude") with the apparent brightness ("apparent magnitude"). Specifically in the case of Cepheids, the absolute magnitude can be deduced from its period.


Is sun the brightest star?

The brightness of a star is usually referred to as its magnitude. Every star has two magnitudes. The apparent magnitude is how bright it appears to us here on earth. The absolute magnitude is the apparent magnitude that the star would have, if it were viewed from a standard distance. The apparent magnitude of our sun is vastly greater than that of any other celestial object. In terms of absolute magnitude, our sun can't begin to compare with some of the big bright stars in the universe.


What is the apparent or absolute magnitude of a star?

A star's 'apparent' magnitude is a measure of how bright it appears to us in our sky. A star's 'absolute' magnitude is a measure of how bright it would appear in our sky if it were located 32 light years distant from us (10 parsecs). The absolute magnitude allows us to directly compare the brightness of one star to the brightness of others, because it removes the effects of their different distances from us.


What is the brightness of stars?

Absolute magnitude. Two stars of the same absolute magnitude usually do not have the same apparent magnitude because one may be much farther from us than the other. The other that is farther away will appear dimmer. To compare absolute brightness, astronomers determine what magnitude the stars would have if they were at a standard distance of about 32.6 light years. The sun has an apparent magnitude of -26.7, if located at a distance of 32.6 light years, have an absolute magnitude of 5. Stars with absolute magnitude values lower than 5 are brighter than the sun. Because of their distance, however, they appear much dimmer.A lot brighter than you think actually.


How can you differentiate the apparent brightness and the absolute brightness of stars?

The apparent brightness of a star is how bright it appears to your eyes. The absolute brightness of a star is a measure of how much light it produces. The absolute brightness of a star is a measure of how a star would compare with other stars if they were all the same distance away from us. Brightness of stars, whether absolute or apparent, is measured in magnitude. The bigger the number, the dimmer the star.


Why do astronomers use absolute magnitude to plot stars why don't they use apparent magnitude?

The first thing they see, of course, is the apparent magnitude - how bright the star looks to us. But to compare the stars with one another, and have an idea about their physical characteristics, they want to know how bright they really are (as well as other characteristics, such as its mass and temperature).


Can you compare two complex numbers?

You can compare their magnitude (absolute values) but not the numbers themselves.


What kind of magnitude measures the luminosity of a star?

The apparent magnitude of a star is a number which tells you how bright it seems compared to others. A first magnitude star looks 100 times as bright as a sixth magnitude star, which latter is the dimmest you can see with the naked eye. Of course the magnitude depends on two things, how bright the star is and how far away it is. To compare stars fairly a scale called absolute magnitude is used. This is the magnitude the star would have if it were 10 parsecs away. Thus absolute magnitude needs to be used if you are to compare two stars fairly.


What measurement allows scientists compare brightness of stars?

Absolute Magnitude.


Which of these measurements allows scientists to compare the brightness of stars?

Absolute Magnitude


What are the three brightnesses of the stars?

I think you are referring to what astronomers call magnitude, which is defined in several different ways. Apparent magnitude is how bright a star looks compared to others. The dimmest stars we can see with the naked eye in good conditions are magnitude 6, and the brightest ones are about 1. Really bright objects like some of the planets have negative magnitude. Absolute magnitude is a way to compare how bright stars really are, because the apparent magnitude is affected by their distance from us. It's the magnitude the star would have if it were exactly ten parsecs away. Bolometric magnitude is more complex, but is an attempt to quantify the star's luminosity over all wavelengths, not just those we can see.


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