Courses
Courses for Kids
Free study material
Offline Centres
More
Store

# How long is the baseline in measuring stellar parallax ?

Last updated date: 05th Aug 2024
Total views: 388.5k
Views today: 6.88k
Verified
388.5k+ views
Hint:Parallax is the measure of distance of the distant object from two separate points. Stellar parallax is how far the star is present by measuring from two points. Stellar parallax method is used to find how far the sun is present away from the earth. Not only planets, any planet, star distance can be measured through this method.

(ii) The p is the parallax angle. The picture shows the right angled triangle with a parallax angle p. The baseline is the distance between the two points where we measured the distance from the earth. Therefore the baseline is the length of $2AU$ . We know that the distance between the earth and sun is equal to $1AU$ . Now here the baseline is twice the astronomical unit(AU).
(iii) Therefore the length of the baseline is $2AU$.
Note:The stellar parallax is the difference between the distance of an object measured from two different points. The baseline is the diameter of the orbit of the earth. Therefore the baseline is measured as $2AU$. Using the baseline, direction of the object , the parallax angle and the distance between the two celestial bodies is known.