Posted by **Jus** on Saturday, May 16, 2009 at 1:46pm.

The stellar magnitude scale compares the brightness of stars using the equation m_2 - m_1 = log(b_1/b_2). where m_2 and m_1 are the apparent magnitude of the two stars being compared (how bright they appear in the sky) and B_2 and B_1 are their brightness (how much light they actually emit). This relationship does not factor in how far from Earth the stars are.

a) The sun appears about 1.3 x 10^10 times as brightly in our sky as does Sirius. What is the apparent magnitude of the sun?

- pre-calc -
**drwls**, Saturday, May 16, 2009 at 2:39pm
The stellar magnitude scale has not been defined correctly in this question. Actually, it is

m2 - m1 = 2.5 log(10)(b1/b2)

so that for each decrease in magnitude by 5, the brightness increases by 100.

I hesitate to answer your question because a wrong formula is being used. The actual magnitude of the sun is about -26.7. Your question is also incomplete because you would need to know the magnitude of Sirius, which is about -1.5 as I recall

## Answer This Question

## Related Questions

- pre-calc - How bright a star appears can depend on how much light the star ...
- physics - An 6.00 g bullet is fired into a 2.30 kg block initially at rest at ...
- Adv. Func./Science Question - Hi, I have this question that I will be tested on ...
- Math - How bright a star appears can depend on how much light the star actually ...
- Advanced Functions - How bright a star appears can depend on how much light the ...
- Physics - A block of mass m_1 is connected by a string over a pulley to a block ...
- Science - The stellar magnitude scale is defined such that if two stars differ ...
- Astronomy - Newton’s version of Kepler’s third law is P^2 = 4pi^2/(G(M_1+M_2)) a...
- KINEMATICS (PHY) - A pulley of mass mp , radius R , and moment of inertia about ...
- Physics Classical Mechanics - A pulley of mass mp , radius R , and moment of ...

More Related Questions