Distances

Question 1

Parallax equation

Answer 1

d(parsecs) = B(AU)/theta(arcseconds)

1 arcseconds = (180/Pi)*3600 radians

Question 2

Velocity equation?

Answer 2

True velocity^2 = radial velocity^2 + tangential velocity^2

Question 3

Apparent magnitude equation?

Answer 3

m=-2.5log(F)+const(magnitude of Vera)

m1-m2 = -2.5log(F1/F2)

Question 4

Absolute magnitude

Answer 4

-magnitude if at a distance of 10parsecs (can be used to compare brightness) (Y axis of an HR diagram)

m-M=5log(d(parsec))-5

Supernova M = -19.3