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About how many stars has Hipparcos given us accurate distance data on?
Wiki User
∙ 6y ago
About 2,5 million in total, but distances only to about 100 000 were considered "accurate".
Wiki User
∙ 6y ago
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Why must a star's parallax be known before you can find the luminosity?
What must be known is the distance. And the most accurate method to measure the distance of nearby stars is the parallax - but this method won't work for stars that are far away.
What are the names of the Taurus stars?
There are almost 250 stars in Taurus, most of which are listed in the Henry Draper Catalogue or the Hipparcos Catalogue. I regret that I do not have time (nor inclination) to sort through that list. You can see it on Wikipedia at https://en.wikipedia.org/wiki/List_of_stars_in_Taurus
What is an advantage of using parallax rather than the Doppler effect to determine star distance?
Parallax is more accurate for stars that are very far away.
What is long wavelength radiation given out by stars?
Infrared radiation is long wavelength radiation given out by stars.
What is the stars in bootes distance from earth?
Each star has a different distance.
What is the name of the telascope used to look at stars?
If you mean, using the parallax method, that might be Hipparcos, or Gaia. From Wikipedia, article "Parallax":In 1989, the satellite Hipparcos was launched primarily for obtaining parallaxes and proper motions of nearby stars, increasing the reach of the [parallax] method tenfold. Even so, Hipparcos is only able to measure parallax angles for stars up to about 1,600 light-years away, ... The European Space Agency's Gaia mission, due to launch in 2012 and come online in 2013, will be able to measure parallax angles to an accuracy of 10 microarcseconds, thus mapping nearby stars (and potentially planets) up to a distance of tens of thousands of light-years from earth.
How many stars did Hipparcus measure?
Perhaps you mean the satellite Hipparcos. It measured the position of over 100,000 stars with high precision. It also measured the position of 2.5 million stars, with lower precision.
Method to measure the distance to nearby stars directly?
For nearby stars, the parallax method gives the most accurate measure of distances.For nearby stars, the parallax method gives the most accurate measure of distances.For nearby stars, the parallax method gives the most accurate measure of distances.For nearby stars, the parallax method gives the most accurate measure of distances.
Why must a star's parallax be known before you can find the luminosity?
What must be known is the distance. And the most accurate method to measure the distance of nearby stars is the parallax - but this method won't work for stars that are far away.
What are the names of the Taurus stars?
There are almost 250 stars in Taurus, most of which are listed in the Henry Draper Catalogue or the Hipparcos Catalogue. I regret that I do not have time (nor inclination) to sort through that list. You can see it on Wikipedia at https://en.wikipedia.org/wiki/List_of_stars_in_Taurus
What is an advantage of using parallax rather than the Doppler effect to determine star distance?
Parallax is more accurate for stars that are very far away.
What is the effect of distance from an object on parallax angles?
The parallax should get smaller and harder to notice although in astronomy there are techniques used to find the parallax of stars by using the Earth's position around the sun to find the distance of the stars.
How do you go about getting a 3-D picture of the big dipper?
You need to know not only the relative positions of the Big Dipper stars on the sky, but also their distances. The positions of the stars are given in coordinates called right ascension (RA) and declination (Dec). The RAs are usually given in units of hours, which relate to how the sky appears to rotate once a day in (approximately) 24 hours. The Decs tell how far the stars are north of the projection of the Earth's equator on the sky. These positions are fairly easy to measure, by just noting where the stars seems to be in the sky as we see them. The distances to the stars are much harder to measure. The Big Dipper stars are close enough to the Earth so that they seem to move around in the sky a little bit when they are viewed at different times of the year from the Earth as it moves in its orbit around the Sun. This small change in position during the year is called parallax by astronomers. The farther from the Sun, the less the stars move around. The best parallaxes come from a space satellite mission called HIPPARCOS. The HIPPARCOS results show that the Big Dipper stars are between about 80 and 120 light years from the Earth, with errors of a light year or two. With the direction and distance to each star in the Big Dipper, one can then make a 3-D plot of the stars' positions. The stars at either "end" of the Dipper (at the end of the "handle" and the outside "lip" of the bowl) are the farthest away from us. The other fice stars in the middle turn out to be at almost the same distance (80 light years) from us. So, one should envision the ends of the Dipper being the farthest away from us, while the stars in the middle form a nearly flat pattern as viewed from the Earth. Answered by David B. Shaffer, Ph.D. in astronomy, from Caltech.
Explain what a light year is and why great distances between stars are given in light years and not miles?
A light-year is the distance light travels in a year. Distances between stars are given in light-years because it is easier to visualize "10 light-years" (the distance travelled by light in 10 years), than "9.5 x 1213 kilometers".
Are all stars the same distance from earth explain?
Well, they clearly aren't for closer stars, astronomers measure the angle the star's light hits the Earth at 6 month intervals - as the Earth rotates around the sun at a known distance, it's simple geometry given the two angles and the diameter of the Earth's orbit to calculate the distance of the star in question and the distance varies.
How does the distance of planets compare to the distance of stars?
Stars are all over Hollywood, planets are above us in the sky.
What is a cosmic distance?
A distance in space, between stars etc.
