Question

even though a Jovian planet is close to its star, its interior temperature is cool. explain what this tells me about the planet's mass.

Answer 1

Mostly Jovian planets are far away from star.Like in our solar system ,There are 4 jovian planets Jupiter,saturn, Neptune, uranous and these planets are so far from our sun and its temperature is very low,even last two jovian planets called ice planets.

Now i am coming on your question ,even jovian planet are close to star but it's cool.Reason is that these planets structure are made by such gases and its Size is so large .if you see the HR Diagram the you will notice that low temperature and high radius stars have large mass.so in case of planets ,in the same manner we can say jovian planets have large massess.

The direct way of measuring massess of planets are kepler's third law,in this case we measure the mass of planet

By using moon's time period and distance between moon and jovian planet and we can easilly calculate mass of planet.

By using this formula--

Planet mass = (4p²/G) × [distance³/(moon's orbital period)²] - moon's mass.

The moon's mass can usually be ignored.

Here p means pi=3.14159

By using this formula we can easilly calculate the mass of planet.

But by using temperature we can derived a roughly idea about mass but can not calculate exactly.