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Is it true that a stars absolute brightness is when its seen from earth?
Wiki User
∙ 13y ago
No - a star as seen from earth is it's apparentbrightness. It's absolute brightness is measured by astronomical instruments. The brightest visible star from earth is Sirius, in the constellation Canis Major. Spica, in Virgo, has a much higher absolute brightness than Sirius, but Sirius is much closer to earth, so it is apparently brighter than Spica.
Wiki User
∙ 13y ago
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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 a stars apparent magnitude?
a stars brightness as seen from Earth
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 are brighter than any single stars?
Double stars, or a Super Nova, or a comet that is close to Earth the Moon and of course Venus. The morning, evening "Star". Actually you have to distinguish between apparent brightness (as seen from Earth) and absolute brightness (as seen from a standard distance). In apparent brightness, Venus, Jupiter and Mars are brighter than any star - but their real brightness is much less. In absolute terms, some things that are brighter than single stars are groups of stars (double stars, star clusters, galaxies, galaxy clusters), exploding stars (novae, supernovae, hypernovae); and quasars.
What factors determine a stars brightness as seen from earth?
Distance from Earth, size of star, and temperature of star.
What factors determine a stars brightness seen from earth?
Distance from Earth, size of star, and temperature of star.
How do you describe variable stars?
A variable star is a star whose brightness as seen from Earth that fluctuates.
What variable of apparent brightness is eliminated when discussing absolute brightness?
Distance. "Absolute magnitudes" are all calculated as if viewed from the same distance, while "apparent magnitude" is how bright the star appears to be as seen from Earth.
What is an example absolute brightness?
Anything that is not the measure of intrinsic brightness of a celestial object.
What is a the brightness of Mars as seen from earth?
it is doubble the brightness
A measure of a stars brightness is called its?
Magnitude. First magnitude descibes many bright stars, and a span of five magnitudes represents a difference of a hundred times in the star's brightness. The dimmest stars seen by a perfect human eye in perfect conditions is 6th magnitude.
Explain a stars apparent magnitude and absolute magnitude?
Apparent magnitude is the brightness of an object as seen from Earth without any atmosphere.Absolute magnitude is the brightness of an object as seen from a predetermined distance, depending on the object.For planets, the distance used is 1 AU (Astronomical Units). Stars and galaxies use 10 parsecs which is about 32.616 light years.The dimmer an object is the higher the positive value. The brighter an object is the higher the negative value.Examples:The Sun has an apparent magnitude of -26.74 but an absolute magnitude of 4.83Sirius has an apparent magnitude of -1.46 but an absolute magnitude of -1.42This means that from Earth, the Sun is a lot brighter, but if the Sun was replaced by Sirius, Sirius would be 25 times more luminous.See related links for more information
