If spectroscopic luminosity classification gives us an estimated distance to the faint star SAO 47552 of about 3300 light- years, then its parallax would be only
A) 0.1".
B) 0.01".
C) 0.001".
D) 3.3".
E) 0.033".

Question

Quizplus · Accepted Answer

The parallax is the angle subtended by the radius of the Earth's orbit as seen from the star. The distance to the star is inversely proportional to the parallax. So, the smaller the parallax, the greater the distance to the star.

If Spectroscopic Luminosity Classification Gives Us an Estimated Distance to the Faint