The discussion revolves around calculating the average temperature of a planet in a circular orbit at 0.4 AU from a star, with an albedo of 30%. The original poster attempts to apply relevant equations related to luminosity and temperature but expresses uncertainty about incorporating the albedo into their calculations.
The discussion is ongoing, with participants providing guidance on the need for additional information, such as the luminosity of the star. There are multiple interpretations of the problem being explored, particularly regarding the role of albedo and atmospheric conditions.
Constraints include the lack of information about the star's luminosity and the assumption that the planet does not have an atmosphere. Participants note that these factors could significantly influence the temperature calculations.
Please define your variables.quasarLie said:F=L/4πD²
What is the contribution of the reflected light to the temperature?quasarLie said:how to use the albedo
It ought to say a bit more... like, assume the planet rotates on its axis sufficiently fast and has sufficient atmosphere (but no greenhouse gases) that the temperature can be assumed roughly equal over the whole surface. Otherwise the answer can be substantially different.quasarLie said:consider a planet in a circular orbit around a star... calculate the average temperature
The planet don't have an atmosphere and it's luminosity is 2/3L (sun). I don't have more informationharuspex said:Please define your variables.
What is the contribution of the reflected light to the temperature?
Edit:
It ought to say a bit more... like, assume the planet rotates on its axis sufficiently fast and has sufficient atmosphere (but no greenhouse gases) that the temperature can be assumed roughly equal over the whole surface. Otherwise the answer can be substantially different.
if you are told that then you should have included it in the problem statement.quasarLie said:The planet don't have an atmosphere