Wednesday
April 1, 2015

Homework Help: Astrophysics

Posted by Judy on Monday, September 18, 2006 at 9:08am.

I'm having trouble understanding the formulas for determining a planet's distance and mass.


A planet's distance is related to the period of revolution and the mass of the central star (e.g, the sun). The relationship is called Kepler's Third law. Distance can also be determined applying trigonometry, using parallax measurement.

The mass of a planet can be determined easily if it has satellites, by again using Kepler's third law. A planet's mass can sometimes be obtained by measuring its "perturbation" effect upon the orbit of a nearby planet or a space probe flying by.

Let us know which formula you are having trouble understanding and one of us w3ill try to provide more specific help.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Astrophysics - You know M(r) = v^2r /G d = distance; s= speed Planet 1: d=2/s=...
Astro - A newly discovered planet orbits a distant star with the same mass as ...
science - if all of the following imaginary planets were the same distance from...
Astronomy - Orbital speed is the speed with which a planet moves around the sun...
Math - The period of revolution of a planet around the sun is the time it takes ...
Physics please help ASAP! - If you know the mass of a star and a planetís radius...
Physics - The star has a mass n_1 times that of the planet, which orbits this ...
Physics - mass of star = 3.80 x 1030 kilograms mass of planet = 6.35 x 1024 ...
Astronomy - Suppose that, in the future, observations with some new telescope ...
Physics - On October 15, 2001, a planet was discovered orbiting around the star ...

Members