0
Why is absolute magnitude of some stars greater than their apparent magnitude for stars?
Wiki User
∙ 11y ago
The apparent magnitude is what we see, and this can be measured directly. The absolute magnitude must be calculated, mainly on the basis of (1) the apparent magnitude, and (2) the star's distance. So, to calculate the absolute magnitude, you must first know the star's distance.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoThe apparent magnitude is the brightness of a star as observed from Earth, and is useful for comparing stars from our perspective. Whereas, absolute magnitude is the brightness as if it were measured 10 parsecs away. This is useful for making direct comparisons between different star's brightness, as distance does not have an influence.
Similarly, by comparing both apparent and absolutevalues, the distance to a star can be calculated using the magnitude equation; M=m-5log(d/10)
Wiki User
∙ 8y agoA star's apparent magnitude is how bright it appears in the night sky, while its absolute magnitude is how bright it actually is.
The suns apparent magnitude is about (-26), while its absolute magnitude is 5.
Two stars with the same apparent magnitude can have different absolute magnitudes when one star is dimmer than the other, but closer to us.
Wiki User
∙ 11y agoThe 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).
Wiki User
∙ 14y agoone of the star could be far and brighter than the other one, but the other star is closer to earth
Wiki User
∙ 7y agoThe absolute magnitude of some stars is greater than their apparent magnitude because they are closer to the Earth.
Debra Lang
Two stars have the same apparent magnitude,
mV = 13,
but Star A has a parallax of 0.080 arc seconds and Star B has a parallax of 0.045 arc seconds.
Add your answer:
Earn +20 pts
What is the actual amount of light a star gives off?
It is actually absolute magnitude, opposed to apparent magnitude which is how much light stars appear to give off.
Is it possible for two regular stars to have the same absolute magnitude but differ in apparent magnitude?
One dimmer star can be closer than a brighter star that is far away. Light flux decreases as the square of the distance. A star that is three times as far away will have to shine nine times brighter than the closer star (absolute magnitude) to appear to have the same magnitude (apparent magnitude). Because apparent magnitude is the brightness of a star, as seen from Earth, whereas absolute magnitude is the brightness of a star as seen from the same distance - about 32.6 light years away.
What are stars with low magnitude low temperature and low absolute magnitude?
This probably refers to red dwarves. The apparent magnitude depends on the distance, as well as the absolute magnitude, but even the closest red dwarves can't be seen with the naked eye.
The true brightness of a star is called its BLANK magnitude?
The scale of star brightness is the 'magnitude'. The definition of the magnitude is: A change of six magnitudes equals a factor of 100. So one magnitude change is a factor equal to the 6th root of 100 = about 2.15443 (rounded)
What are the relationships between 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
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 two ways to describe a stars brightness?
Apparent magnitude and absolute magnitude.
Why is the absolute magnitude of some stars greatar than their apparent magnitude?
The question is: Why is the apparent magnitude of some stars less than their absolute magnitude. Or: Why do some stars not look as bright as they really are ? The answer is: Because they're so far away from us.
What is the actual amount of light a star gives off?
It is actually absolute magnitude, opposed to apparent magnitude which is how much light stars appear to give off.
How does apparent magnitude of a star differ from absolute magnitude?
Apparent magnitude is the brightness as observed from earth, while absolute magnitude is the brightness of a star at a set distance. The apparent magnitude considers the stars actual brightness as well as it's distance from us, but absolute magnitude takes the distance factor out so that star brightnesses can be directly compared.
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.
How 2 stars could have the same apparent magnitude but different absolute magnitudes?
ble
What is a stars brightness as if it were a standard distance?
Theres `Absolute Magnitude` which is the brightness of a star at a set distance. Then there is `Apparent Magnitude` which is the apparent brightness from earth, regardless of distance.
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
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.
Which one tells us how bright the stars would appear if all stars were at the same distance ferom the earth?
There are two terms used to describe a stars brightness, absolute magnitude and apparent magnitude. The one you want is absolute magnitude - this is where the stars distance from us is taken out of the equation, effectively comparing the stars brightness side by side from a set distance (10 parsecs or 32.6 light years). Apparent magnitude is the other measure, this is how bright a star apparently looks from Earth. The huge distances and range of distances involved means that you can have very bright stars (high absolute magnitude) that apparently look as bright as a much closer but dimmer (low absolute magnitude) star - their apparent magnitudes might be similar, but they may have vastly different absolute magnitudes.
What is an example absolute brightness?
Anything that is not the measure of intrinsic brightness of a celestial object.
