How do you calculate the temperature of a planet?

How do you calculate the temperature of a planet?

To find the effective (blackbody) temperature of a planet, it can be calculated by equating the power received by the planet to the known power emitted by a blackbody of temperature T. Take the case of a planet at a distance D from the star, of luminosity L. is the Stefan–Boltzmann constant.

How is the size of planets calculated?

The most common is to measure the apparent angular diameter of the planet – how big it looks against the sky – very precisely using a telescope. Combining this with a measure of its distance (deduced from its orbit around the Sun) reveals the planet’s actual size.

How do we measure the temperature of a distant star or planet?

Thus, for stars, considering them as “black bodies”, we can get an approximate figure for their temperature by measuring their dominant frequency (color). Technically scientists measure the brightness of the blue light and that of red light from the star, and from this they can calculate the temperature of the star.

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How do scientists calculate the temperature of a star?

To the extent that Stellar spectra look like blackbodies, the temperature of a star can also be measured amazingly accurately by recording the brightness in two different filters. To get a stellar temperature: Measure the brightness of a star through two filters and compare the ratio of red to blue light.

How do you calculate planet albedo?

Scientists use the term albedo to describe how much light a planet or surface reflects away….

  1. E = total energy intercepted (technically, energy flux = energy per unit time, in watts)
  2. KS = solar insolation (“solar constant”) = 1,361 watts per square meter.
  3. RE = radius of Earth = 6,371 km = 6,371,000 meters.

How can we determine the temperature of a star or surface of a planet quizlet?

What is the sequence in order of decreasing temperature? The way astronomers determine the surface temperature of a star which is determined by the spectral lines present in a stars spectrum.

How do we measure star size?

Direct imaging. It seems obvious: if you want to measure the size of a star, just point your telescope at it and take a picture. Measure the angular size of the star in the image, then multiply by the distance to find the true linear diameter.

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How do you calculate the equilibrium temperature of a planet?

The equilibrium temperature of a planet is determined by the size, temperature, and distance to its parent star, but not on its own size. This is below the freezing point of water; if this was really the true mean temperature of the Earth, the oceans would be largely frozen. What are we missing?

How do you calculate solar radiation from temperature?

The corresponding equation (radiation Vs temperature) obtained from the computer is R=3E-26e0. 2117T (3) where R is the instant solar radiation and T is the instant temperature. Taking x = Temperature = T and y = Radiation = R, we get the required data for x, y, Y, x2 and Yx from tab. 2.

How can the temperature of a star be determined quizlet?

4) A star’s temperature can be determined by measuring the spectrum (color) of the star. 6) Luminosity is a measure of a stars power output (energy per second). A star’s luminosity depends on the star’s temperature and size, and both of those things are determined by the star’s mass.

How do we measure the size of a planet?

The most common is to measure the apparent angular diameter of the planet – how big it looks against the sky – very precisely using a telescope. Combining this with a measure of its distance (deduced from its orbit around the Sun) reveals the planet’s actual size. Another method involves studying the motion of moons as they eclipse the planet.

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How do scientists measure the temperature of a star?

Thus, for stars, considering them as “black bodies”, we can get an approximate figure for their temperature by measuring their dominant frequency (color). Technically scientists measure the brightness of the blue light and that of red light from the star, and from this they can calculate the temperature of the star.

How do you determine the temperature of a planet?

The temperature can be inferred by what materials haven’t frozen out of the atmosphere yet, which can be determined with spectroscopy. Typically, the first one is done, and the second when a more accurate method cannot be used (IE, no direct spectrum of the planet observed). Highly active question.

How do you find the radiant heat power of a star?

According to this law, the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature. L = 4πR 2 σT 4 . Here σ is the Stefan-Boltzmann constant, L is the luminosity, R and T are the radius and temperature of the star under consideration.