A star has a parallax of 0.8 seconds of arc. What is the distance of the star?

You measure a star to have a parallax angle of 0.04 arc-seconds. What fraction of a degree is this?

A star is observed to have a parallax of 0.0015".  What is the distance to the star in  units of AU?

How far away is the star Spica, whose parallax is 0.0130?

What is the lifetime on the main sequence of a star whose surface temperature is 6500° K and whose radius is 2 X 109 m ? ( LS=3.826 X 1026 J/s)

What is the parallax of a star that is 150 pc from Earth?

If we view a star now, and then view it again 6 months later, our position will have changed by the diameter of the Earth's orbit around the sun. For nearby stars (within 100 light-years or so), the change in viewing location is sufficient to make the star appear to be in a slightly different location in the sky. Half of the angle from one location to the next is known as the parallax angle (see figure). Parallax can be used to measure the distance to the star. An approximate relationship is given by d =  3.26 p , where d is the distance in light-years, and p is the parallax measured in seconds of arc. Vega is a star that has a parallax angle of 0.13 second. How far is Vega from the sun? Note: Parallax is used not only to measure stellar distances. Our binocular vision actually provides the brain with a parallax angle that it uses to estimate distances to objects we see. (Round your answer to two decimal places.)  light-years

A nearby star has a parallax of 0.317 arcseconds. How long does it take the light from this star to reach us?

A star has an apparent magnitude of 6 and an absolute magnitude of 3. How far is the star from Earth?

You measure a star to have a parallax angle of 0.12 arc-seconds What is the distance to this star in parsecs? 8.33 Hint: d = 1/p What is the parallax angle of a different star that is twice as far away as the star from the previous problems? [answer in arc-seconds without including the unit]