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Integration of Plank curve of the Sun

There are two issues here: one of definitions and one of code. First, the value you're expecting to get here -- 1361 Watts per square meter, the solar constant -- is the total flux received from the ...
• 37.3k
Accepted

Integration of Plank curve of the Sun

There is two issues: a) you have to use Earth distance to get the Solar constant, but you use 1pc ($10^{16}$m)instead of one astronomical unit (150 million kilometers, $1.5\cdot 10^{11}$m). That's a ...
• 20.5k
Accepted

How is the difference of bolometric magnitudes not dependent on the stars' radii?

The R in that equation is the distance from the star to observer, not the star radius. The light emitted from the star is distributed uniformly on a sphere of radius R, and when the light arrives to ...
• 188
Accepted

• 158k
1 vote

How to get the flux from a synthetic spectrum in a bandpass, when only given specific luminosity times frequency?

You should not be dividing by wavelength in your first step. The values in each given wavelength interval have already the dimension of luminosity ($erg/s$), so you just have to divide these by \$4\pi ...
• 3,617
1 vote
Accepted

Calculating the luminosity of a comet

I believe, givn the paucity of information in the question, that what is meant is that if the comet is only visible by virtue of light it reflects, then what is its luminosity. This can be calculated ...
• 158k

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