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Why does a cool distant supergiant star such as Betelgeuse have such a high apparent magnitude?
Wiki User
∙ 10y ago
Because it's huge ! It's a supergiant! Hence the word SUPER!
Wiki User
∙ 10y ago
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If two stars have the same apparent magnitude are they the same distance from Earth?
No. Brighter distant stars can have the same apparent magnitude as fainter stars that are closer.(Absolute magnitude does not refer to actual brightness, but rather to what the brightness of a star would likely be at an arbitrary distance of 10 parsecs, rather than its actual distance.)
What is a star like object is very bright and distant?
If this is a homework question the answer you are probably looking for is Quasar [See related question] However, the actual question is full of inconsistencies. Brightness is defined as being observed from Earth and distance is relative to your frame of reference - Apparent magnitude [See related question - Apparent magnitude] Therefore, a bright object could be the Sun, and in normal relative terms it is distant, to some very distant. A quasar on the other hand is not very bright from Earth but it is very very distant. For the question to fit the answer, the question should be "What star like object is very luminous and very far away". or "What star like object has a high absolute magnitude and is very distant [See related question - Absolute magnitude]
Which stars always have large positive absolute magnitude?
Does it mean that the star is a main sequesnce star? ( . Y . ) The above isn't true. A star can be a blue supergiant and be on the main sequence but still not be even visible to us, therefore the apparent and absolute magnitude wouldn't be the same. But to answer your question, I don't think it has a name, it just means that you are seeing the star's absolute and apparent magnitude at the same time, so if you placed the star at 32.6 light years away(the absolute magnitude scale)then the star would not appear to change in brightness
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.
Why does venus have an apparent magnitude greater than a star?
Although it does not emit its own light like a star, the planet Venus is very close to Earth compared to the stars. This means that the light reflected off its surface from the sun makes it brighter than the distant stars.
Red supergiant in the constellation scorpius?
Antares -- 604 light-years distant, magnitude 1.05, an "M" class star, cooler than our Sun.
If two stars have the same apparent magnitude are they the same distance from Earth?
No. Brighter distant stars can have the same apparent magnitude as fainter stars that are closer.(Absolute magnitude does not refer to actual brightness, but rather to what the brightness of a star would likely be at an arbitrary distance of 10 parsecs, rather than its actual distance.)
What is a star like object is very bright and distant?
If this is a homework question the answer you are probably looking for is Quasar [See related question] However, the actual question is full of inconsistencies. Brightness is defined as being observed from Earth and distance is relative to your frame of reference - Apparent magnitude [See related question - Apparent magnitude] Therefore, a bright object could be the Sun, and in normal relative terms it is distant, to some very distant. A quasar on the other hand is not very bright from Earth but it is very very distant. For the question to fit the answer, the question should be "What star like object is very luminous and very far away". or "What star like object has a high absolute magnitude and is very distant [See related question - Absolute magnitude]
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.
Which stars always have large positive absolute magnitude?
Does it mean that the star is a main sequesnce star? ( . Y . ) The above isn't true. A star can be a blue supergiant and be on the main sequence but still not be even visible to us, therefore the apparent and absolute magnitude wouldn't be the same. But to answer your question, I don't think it has a name, it just means that you are seeing the star's absolute and apparent magnitude at the same time, so if you placed the star at 32.6 light years away(the absolute magnitude scale)then the star would not appear to change in brightness
What is higher for closer stars?
If they had the same intrinsic brightness, then yes. However stars vary enormously in their intrisic brightness, so Deneb is distant, but one of the brightest stars in the Northern sky, whereas proxima centuri is the closest star to us, but so dim that it cannot be seen without a mid-size telescope.
Why does venus have an apparent magnitude greater than a star?
Although it does not emit its own light like a star, the planet Venus is very close to Earth compared to the stars. This means that the light reflected off its surface from the sun makes it brighter than the distant stars.
Why can two stars can have the same apparent magnitude and different total magnitudes?
Two different stars with different luminosity may appear to have the same brightness to an observer because the brighter may be more distant. This illustrates the need in astronomy to help range distant stars; since apparent magnitude alone will not yield enough information to gauge distance. The establishment of a "standard candle" or object of known brightness can be used for comparison; these can be established through various means including statistical models, observation of variable stars, behavior of nearby supernovae, etc. Once the distance of a star is known, the absolute magnitude can be derived from the apparent magnitude using the inverse-square law.
Why Vega brighter than Arcturus?
The apparent brightness of stars depends on:* The distance * The actual brightness * In some cases, the brightness may be dimmed by clouds of dust and gas, between us and the distant star. In the case of Vega and Arcturus, Vega is NOT brighter than Arcturus. Their apparent magnitude (brightness) is about the same, with Arcturus perhaps being slightly brighter, depending on the source consulted. In terms of real brightness ("absolute magnitude"), Arcturus is actually brighter. When consulting numbers, please remember that smaller numbers refer to brighter objects.
What is The apparent change in position of an object with respect with respect to a distant background is called?
Parallax id the apparent shift in position of an object with respect to the background due to a shift in view point.
What is the dimmest star in the constellation Sagittarius?
The dimmest star in the defined area called Sagittarius is SWEEPS J175902.00-291323.7 with an apparent magnitude of +26.23.The dimmest star in the zodiac Sagittarius is ο Sgr (Manubrij or Manubrium) with an apparent magnitude of +3.76
How far an object travels in a certain period of time is?
Relative or apparent motion.
