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Layers of Earth

When the obse...

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When the observations are taken at an interval of 6 months, the angle of parallax of a star is 0.4". Find the distance of star in parsec?

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1.45 p a r s e c

light years away. How much parallax would this star show when viewed from two locations of the earth six months apart in its orbit around the sun?

Q. The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun ?

Q. The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun ?

A star has a parallax angle p of 0.723 arcseconds. What is the distance of the star?

Q. The principle of 'parallax' in section

2.3.1

is used in the determination of distances of very distant stars. The baseline AB is the line joining the Earth's two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth's orbit

\approx 3 \times 10^{11}

m. However, even the nearest stars are so distant that with such a long baseline, they show parallax only of the order

1 "

(second) of an arc or so. A parsec is a convenient unit of length on the astronomical scale. It is the distance of an object that will show a parallax of

1 "

(second) of arc from opposite ends of a baseline equal to the distance from the Earth to the Sun. How much is a parsec in terms of metres ?

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