Question

The parallax angle subtended by a star is 15" with respect to a base line of 1AU. What is its distance from earth in light year?​

Answer 1

Answer:

Explanation: The formula for distance is d = 1/(parallax angle in radian) AU. Here, for 1 second parallax angle, the distance is 1 parsec. So, for 0.1 second, it is 10 parsecs= 10 X 206364.8 AU.

Explanation:

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Answer 2

Answer:

0.217 ly

Explanation:

d=b/theta

b=1AU=1.496 x 10¹¹ m

theta= 15 x 4.85/10⁶ rad

d= 1.496x10¹¹/15 x 4.85/10⁶

=205.6 x 10¹³ m

1ly = 9.47 x 10¹⁵ m

205.6 x 10¹³ / 9.47 x 10¹³ = 0.217 ly