Questions regarding how bright an object appears to be.
Questions tagged [apparent-magnitude]
130 questions
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Comparing different magnitudes. Is this statement correct?
I have two methods which allow for a detection of a signal that is at most of magnitude x. If method 2 can detect signal that are half a magnitude larger, i.e. fainter, let's say x.5 mag, is it correct to say that method 2 can detect signals that…
Philipp
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3
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What is the "lunar irradiance" received by the Earth from the full Moon?
The solar irradiance received by the Earth is 1361 $W/m^2$. What is the lunar irradiance received by Earth from the full Moon in the same units? My first thought was to work it out via apparent magnitude but I don't think that would work out.
ChristieToWin
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What is wrong with my calculations of Jupiter's apparent magnitude?
I was searching for a formula to calculate the apparent magnitude of a planet knowing its physical characteristics and stumbled upon this answer.
The final formula given is:
$$m_{planet} = V_{planet} + 5 \log_{10}\left( d_{e-p} \right) - 5$$
In…
ChristieToWin
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A double star consists of two stars of equal brightness at equal distance from the Earth. What is the apparent magnitude of the combined object?
The magnitude of each star in the V-band is mV= 8.34. If these stars are so close together that they appear as one object, what is the apparent magnitude of the combined object?
I just want someone to point me in a general direction of how to…
Anupam Dhungana
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total energy and apparent bolometric magnitude
So I have been given this question:
A typical Type Ia Supernova emits $10^{44}\ \mathrm{J}$. All nuclear weapons
tested by humans have released a total of about $2\times10^{6}\ \mathrm{TJ}$ of energy. Assume the Supernova energy is released at…
Jason Taylor
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How bright would Alpha Centauri appear (in apparent Magnitude) if it were 1 light year away?
I'm trying to determine what a star of comparable mass and luminosity to the Sun would look like from the surface of the Earth if it were 1 light year away - I chose Alpha Centauri since it is close to us, and similar to the Sun. Could a star like…
T. Traver
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What is the share of stars in total radiation input of Earth?
Earth gets its radiation input primarily from Sun, then from reflected sunlight from Moon, and stars. Among these, what is the share of stars (or sources outside solar system) to this total radiation input of Earth. Is it negligible compared to…
dsvthampi
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Is subtracting one apparent magnitude from another ever practical?
Does a circumstance exist for subtracting one apparent magnitude from another to reach a solution to a problem? Is it ever suitable to do so?
Constantthin
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