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Because Rigel is much farther away. Rigel is 770 light-years away, and Sirius is only 8.6 light-years away.
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∙ 13y ago
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Which is brighter Sirius or Rigel?
Sirius has a luminosity of: 25.4 while Rigel has a luminosity of: 66,000 Making Rigel brighter than Sirius.
What star has a greater magnitude a Rigel or Sirius?
Sirius, which means that Rigel is brighter.
Even though this star has an absolute magnitude greater then that of sirius it looks dimmer from earth since it's 100 times farther away?
The apparent brightness of a star depends mainly on (1) its absolute (i.e., real) brightness, and (2) the square of its distance from us. The absolute magnitude of Sirius is +1.45, while that of Rigel is -6.95, meaning that Rigel is approximately 2,290 times as bright as Sirius. However, Rigel is approximately 100 times as far from us (870 light years versus 8.6 light years), which reduces its brightness relative to Sirius by a factor of over 10,000. This makes Sirius about 4.5 times brighter than Rigel for a difference of 1.62 magnitudes (-1.44 relative magnitude for Sirius versus +0.18 for Rigel).
Does Rigel have greater apparent magnitude than Sirius?
No, which means that Rigel appears brighter.
Are the brightest stars always the largest?
No because they might just be bright because they are close, like Sirius and Procyon, or they might be bright because they are really are huge stars a long way way, like Rigel and Deneb.
Which is brighter Sirius or Rigel?
Sirius has a luminosity of: 25.4 while Rigel has a luminosity of: 66,000 Making Rigel brighter than Sirius.
What star has a greater magnitude a Rigel or Sirius?
Sirius, which means that Rigel is brighter.
Which star has the less absolute magnitude rigel or Sirius?
Sirius has less absolute magnitude than Rigel. Sirius is smaller and less luminous than Rigel, but much closer to us, so Sirius appears brighter. Sirius, in fact, is the brightest star in our sky (with the exception of our own star, the sun.) Rigel is still pretty bright, but many times farther away from us than Sirius.
Which star is bigger sirius or rigel?
Rigel is approximately ten times LARGER than Sirius
What is the bright bluish star?
Without knowing direction of even hemisphere, it's difficult to be precise. A best guess would be Sirius or Rigel.
Even though this star has an absolute magnitude greater then that of sirius it looks dimmer from earth since it's 100 times farther away?
The apparent brightness of a star depends mainly on (1) its absolute (i.e., real) brightness, and (2) the square of its distance from us. The absolute magnitude of Sirius is +1.45, while that of Rigel is -6.95, meaning that Rigel is approximately 2,290 times as bright as Sirius. However, Rigel is approximately 100 times as far from us (870 light years versus 8.6 light years), which reduces its brightness relative to Sirius by a factor of over 10,000. This makes Sirius about 4.5 times brighter than Rigel for a difference of 1.62 magnitudes (-1.44 relative magnitude for Sirius versus +0.18 for Rigel).
Does Rigel have greater apparent magnitude than Sirius?
No, which means that Rigel appears brighter.
Are the largest star the brightest?
No because they might just be bright because they are close, like Sirius and Procyon, or they might be bright because they are really are huge stars a long way way, like Rigel and Deneb.
Are the brightest stars always the largest?
No because they might just be bright because they are close, like Sirius and Procyon, or they might be bright because they are really are huge stars a long way way, like Rigel and Deneb.
What are 5 stars in our galaxy?
Sirius, polaris, cygnus, betelgeuse, & rigel
Rigel aldebaran Sirius Antares KY cygni betelgeuse pollux arrange in ascending order?
In terms of size from smallest to largest, its Sirius, Pollux, Aldebaran, Rigel, Betelgeuse, Antares, and KY Cygni.
Give the name of four stars in your galaxy?
Sirius, Rigel, Pollux and Castor
