Purchase Solution

Orbital Speed/Angular Diameter

Not what you're looking for?

Ask Custom Question

Because of the presence of Jupiter, the Sun moves in a small orbit of radius 742,000 km with a period of 11.86 years. (a) Calculate the Sun's orbital speed in meters per second.
(b) An astronomer on a hypothetical planet orbiting the star Vega, 25 light-years from the Sun, wants to use the astrometric method to search for planets orbiting the Sun. What would be the
angular diameter of the Sun's orbit as seen by this alien astronomer? Would the Sun's motion be discernible if the alien astronomer could measure positions to an accuracy of 0.001 arcsec?
(c) Repeat part (b), but now let the astronomer be located on a hypothetical planet in the Pleiades star cluster, 360 light-years from the Sun. Would the Sun's motion be discernible to this astronomer?

The text offers the answers but I am not coming up with them using the formulas, please assist with the proper formula and calculations needed to get the answer.
Thanks

Purchase this Solution

Solution Preview

(a)
Sun's orbital speed = orbit distance / time

orbit distance = 2*pi*radius = 2*pi*742,000 km = 4,662,123 km
time = 11.86 years = 433 days = 103,894 hrs = 6,233,616 min = 374,016,960 sec

Sun's orbital speed = 4,662,123 km / 374,016,960 sec
= 0.0125 km / sec
= 12.47 meters / ...

Purchase this Solution


Free BrainMass Quizzes
Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

Basic Physics

This quiz will test your knowledge about basic Physics.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

The Moon

Test your knowledge of moon phases and movement.