Suppose a star were observed at both ends of Earth’s orbit to have moved an angle of .05arcsec (parallax of .025 arcsec). How far away is it?
Suppose a star were observed at both ends of Earth’s orbit to have moved an angle...
You measure a star to have a parallax angle of 0.14 arc-seconds. What fraction of a degree is this? Answer: /Problem 2 - Parallax to human eye 2. [3pt] By how many times would you have to magnify this effect for it to be visible to the human eye? (The limit of human vision is about 1 arc-minute) Answer: 3. [3pt] What is the distance to this star in parsecs? Answer: 4. [2pt] What is the distance to this star...
(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!
I need question 6 5. Stellar Parallax and a Parsec (15 pts.) A star with l arcsecond parallax angle (0) it is definedto be 1 parsec away. Let's calculate the value of a parsec. Examine the diagram below. When viewed from the two positions (3 months apart), the star's position shifts by the angle e. Sun Earth Star (a) What is the distance (a) in km? (b) The distance (b) can be derived from trigonometry, tan(6) -alb. What is the...
Star A is 19 times as far away as star B. Both appear to have the same brightness. What is the ratio of the luminosity of star A to that of star B?
Star A is 5 times as far away as star B. Both appear to have the same brightness. What is the ratio of the luminosity of star A to that of star B?
Suppose that you have a planet in a circular orbit about a star with the mass of the Sun. The orbital speed is 141 km/s. If you could increase the planet’s speed, what speed would you need to make it to escape the gravitational pull of its parent star?
Suppose a star has a luminosity of 9.0×1029 watts and an apparent brightness of 9.0×10−15 watt/m2 . How far away is it? Give your answer in both kilometers and light-years.
Suppose a star has a luminosity of 6.0×1026 watts and an apparent brightness of 4.5×10−12 watt/m2 . How far away is it? Give your answer in both kilometers and light-years.
Suppose that two identical stars (they have the same total light output) are located so that star A is at a distance of 5 pc and star B is at a distance of 25 pc from Earth. How will star B appear, compared with star A? A star is at such a distance that its apparent magnitude (m) is 10 magnitudes fainter than its absolute magnitude (M). How far away is it? Three stars have the following apparent (m) and...
Suppose we have a tube with adjustable length and open at both ends. The wavelength of the fundamental mode of vibration is lambda for a given length. Suppose now that the tube is adjusted to twice the given length. What happens to the wavelength of the fundamental mode? A. It is halved. B. It is doubles. C. It quadruples. D. Can’t tell without knowing the velocity of sound in air E. Can’t tell without knowing the frequency of vibration F....