college lever astronomy

Question

What is the distance and apparent magnitude for Antares?

802 pc and 1.3

2.7 pc and -1.5

170 pc and 1.0

197 pc and 0.4

Answer 1

If I had looked at this question first, I would have chosen 170 pc for calculating the brightness ratio. Anyway, 170 pc is within range of distance measurements, and apparent magnitude is around 1.0.