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Luminosity, size and distance. If all distances were equal, larger and hotter stars would be the brightest. But a so-so star 40 light years away, will frequently be brighter than a brilliant star 40,000 light years away, etc.
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Which star is brighter -2 or -3?
The way stellar magnitude works, a smaller number is associated with increased brightness. Since -3 < -2, a magnitude -3 star would be brighter than a magnitude -2 star. Each decrease in magnitude by 1 means in increase in brightness by a factor of about 2.5119. Equivalently, each decrease in magnitude by 5 means an increase in brightness by a factor of 100. Incidentally, the brightest star in the sky (Sirius) has an apparent magnitude of only about -1.5.
What is an apparent brightness?
An apparent brightness is the brightness of a star as measured by an observer.
Compared to a magnitude 1 star a star with a magnitude of 2 is?
A magnitude 1 star is about 2.512 times brighter than a magnitude 2 star. The exact factor is the fifth root of 100 - this means that a difference of 5 magnitudes is equivalent to a brightness factor of 100.
A star whose brightness changes?
A star who's brightness changes is called a variable star.Examples are:AlgolPolarisBetelgeuse.See related link for more information.
If the distance between us and a star is doubled with everything else remaining the same the luminosity?
remains the same, but the apparent brightness is decreased by a factor of four
Which factor does not affect the apparent brightness of a star?
How old a star is.
What terms takes into consideration the brightness of a star but ignores the differences that distance can make?
"Apparent magnitude" is the star's brightness after the effects of distance. "Absolute magnitude" is the star's brightness at a standard distance.
What two factor affect a stars apparent brightness?
Two factors that affect a star's apparent brightness are: 1.) The distance between the Earth and the star 2.) The absolute magnitude (the actual brightness) of the star Hope that helps :P
What factor affects the absolute brightness of a star?
Energy output, as absolute brightness (magnitude) is taken at a standard distance of 10 parsecs.
What does the absolute brightness of the star depend on?
the brightness of a star
What is the measure of the star's brightness?
The measure of a star's brightness is its magnitude. A star's brightness as it appears from Earth is called its Apparent Magnitude.Star's brightness is measured by there magnitude.
What measures the brightness of the star?
photographs use to measure the brightness of a star
If the distance between us and a star is doubled the apparent brightness is decreased by a factor of four true or false?
True!
A star's brightness is the brightness seen by humans on Earth. A star's brightness is its actual brightness and does not depend on where the star is viewed from.?
The brightness as seen from Earth is called the "apparent magnitude".The real brightness (defined as the apparent brightness, as seen from a standard distance) is called the "absolute magnitude".
What is difference between apparent brightness and absolute brightness?
Absolute Brightness: How bright a star appears at a certain distance. Apparent Brightness: The brightness of a star as seen from Earth.
What is the purpose of a star's brightness?
There is no purpose of a star's brightness. They just exist and shine.
Which star is brighter -2 or -3?
The way stellar magnitude works, a smaller number is associated with increased brightness. Since -3 < -2, a magnitude -3 star would be brighter than a magnitude -2 star. Each decrease in magnitude by 1 means in increase in brightness by a factor of about 2.5119. Equivalently, each decrease in magnitude by 5 means an increase in brightness by a factor of 100. Incidentally, the brightest star in the sky (Sirius) has an apparent magnitude of only about -1.5.
