Stellar Parallax (Grades 11-12)
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Astronomers have calculated the parallax angles of millions of stars.
Nearby stars have large parallax angles.
The parallax of a star is inversely related to its
The parallaxes of nearby stars are produced by
- stellar motion across our line of sight.
- stellar motion along our line of sight.
- the rotation of the galaxy.
- Earth's rotation on its axis.
- Earth's revolution around the sun.
Parallax is useful for measuring the distance of stars up to about light-year(s) from Earth.
1 parsec is about equal to light-year(s).
Alpha Centauri has a parallax of 0.74 arcsec. What is the approximate distance to Alpha Centauri in parsecs?
- 0.55 parsec
- 0.74 parsec
- 1.35 parsec
- 1.74 parsec
If a star has a parallax of arcseconds, then its distance is .
- 0.2; 20 parsecs
- 0.04; 25 light years
- 0.1; 10 light years
- 0.25; 4 parsecs
- 0.5; 0.5 parsecs
How does distance affect parallax?
A star has a parallax of 0.5 arc sec. Calculate the distance to the star in parsecs.