Night sky
... • Sidereal time is time kept relative to the stars (rather than the Sun). Local sidereal time = 0h when a star with RA = 0h crosses the meridian (like noon = Sun crossing the meridian). • RA uses time units to make it easy to compute the position of a star on the sky at any time of night. • A star t ...
... • Sidereal time is time kept relative to the stars (rather than the Sun). Local sidereal time = 0h when a star with RA = 0h crosses the meridian (like noon = Sun crossing the meridian). • RA uses time units to make it easy to compute the position of a star on the sky at any time of night. • A star t ...
Slide 1
... processes within the body of the star itself. Stars typically range in mass between 0.08 and 100 solar masses. A Hertzprung-Russell diagram is a very useful illustration of the relationship between various key stellar properties, namely the luminosity and the effective temperature (related to both s ...
... processes within the body of the star itself. Stars typically range in mass between 0.08 and 100 solar masses. A Hertzprung-Russell diagram is a very useful illustration of the relationship between various key stellar properties, namely the luminosity and the effective temperature (related to both s ...
The Hertzsprung-Russell Diagram
... Hertzsprung and Russell had the idea of plotting the luminosity of a star against its spectral type. This works best for a cluster, where you know the stars are all at the same distance. Then apparent brightness vs spectral type is basically the same as luminosity vs temperature. They found that sta ...
... Hertzsprung and Russell had the idea of plotting the luminosity of a star against its spectral type. This works best for a cluster, where you know the stars are all at the same distance. Then apparent brightness vs spectral type is basically the same as luminosity vs temperature. They found that sta ...
Cosmic Distance Ladder
... distance from the Sun in terms of the distance of the Earth from the Sun, an accurate absolute value of this distance had not been calculated. Astronomical Unit (AU): The Earth-Sun distance = 150 Million km=1.5E13 cm ...
... distance from the Sun in terms of the distance of the Earth from the Sun, an accurate absolute value of this distance had not been calculated. Astronomical Unit (AU): The Earth-Sun distance = 150 Million km=1.5E13 cm ...
Page 48
... 8. Meteoroid – A meteoroid is small pieces of comet that move through space. 9. Meteorite – A meteorite is a meteoroid that strikes the earth. Page 54 10. Meteor – A meteor is a small meteoroid that burns up in Earth’s atmosphere. 11. Asteroid Belt – the Asteroid Belt is a region between Mars and Ju ...
... 8. Meteoroid – A meteoroid is small pieces of comet that move through space. 9. Meteorite – A meteorite is a meteoroid that strikes the earth. Page 54 10. Meteor – A meteor is a small meteoroid that burns up in Earth’s atmosphere. 11. Asteroid Belt – the Asteroid Belt is a region between Mars and Ju ...
Astronomy Unit Test Review Sheet
... 2. What is an optical telescope? What is the difference between a reflecting and a refracting telescope? What other types of telescopes do scientists use to gather information? Optical telescopes are used to see visible light from far away. Refracting uses a glass lens and a reflecting telescope use ...
... 2. What is an optical telescope? What is the difference between a reflecting and a refracting telescope? What other types of telescopes do scientists use to gather information? Optical telescopes are used to see visible light from far away. Refracting uses a glass lens and a reflecting telescope use ...
Astrophysics
... star -- so if it looks dim it must be a very long way away A red star is not as bright, so if it looks bright it must be relatively close. For example: Sirius and Alpha Centauri are similar in apparent brightness but Sirius is bluish while A.Cent. is yellowish ...
... star -- so if it looks dim it must be a very long way away A red star is not as bright, so if it looks bright it must be relatively close. For example: Sirius and Alpha Centauri are similar in apparent brightness but Sirius is bluish while A.Cent. is yellowish ...
types of stars, luminosity, and brightness
... 5. The absolute brightness is the brightness that would be measured at a standard distance of 10 pc. Apparent brightness is the brightness of a star measured from Earth. 6. Absolute brightness is the luminosity of a star as it would be measured at 10 pc. Luminosity is the intrinsic energy per sec th ...
... 5. The absolute brightness is the brightness that would be measured at a standard distance of 10 pc. Apparent brightness is the brightness of a star measured from Earth. 6. Absolute brightness is the luminosity of a star as it would be measured at 10 pc. Luminosity is the intrinsic energy per sec th ...
Activity 10: Lifecycle Of A Star
... 5. What happens after this point depends on the _______ of the star. A star the size of our ...
... 5. What happens after this point depends on the _______ of the star. A star the size of our ...
Introduction and some basic concepts
... For observers in mid-northern latitudes, the northern sky is like a large clock face. Knowing the day of the year, it is possible to use the orientation of the Big Dipper or some other circumpolar constellation to determine your clock time. With your eyeballs, a protractor, and some relatively simp ...
... For observers in mid-northern latitudes, the northern sky is like a large clock face. Knowing the day of the year, it is possible to use the orientation of the Big Dipper or some other circumpolar constellation to determine your clock time. With your eyeballs, a protractor, and some relatively simp ...
Foundations III The Stars
... scorching hot. But because the star Gliese 581 is only about 1 percent as bright as the sun, temperatures on the new planet should be much more comfortable. Taking into account the presence of an atmosphere and how much starlight the planet probably reflects, astronomers calculated the average tempe ...
... scorching hot. But because the star Gliese 581 is only about 1 percent as bright as the sun, temperatures on the new planet should be much more comfortable. Taking into account the presence of an atmosphere and how much starlight the planet probably reflects, astronomers calculated the average tempe ...
Star Formation
... temperature and luminosity, and thus its place on the main sequence • Stars with more heavy elements are cooler and slightly less luminous than stars of the same mass with fewer ...
... temperature and luminosity, and thus its place on the main sequence • Stars with more heavy elements are cooler and slightly less luminous than stars of the same mass with fewer ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.