Announcements - Lick Observatory
... The Second Ascent Giant Branch • Horizontal-branch stars (like main-sequence stars) begin to use up their fuel in the core. • In this case, the star is building up a Carbon core. For stars near 1Mo the temperature never gets high enough for Carbon fusion. • The core begins to contract, releasing gr ...
... The Second Ascent Giant Branch • Horizontal-branch stars (like main-sequence stars) begin to use up their fuel in the core. • In this case, the star is building up a Carbon core. For stars near 1Mo the temperature never gets high enough for Carbon fusion. • The core begins to contract, releasing gr ...
Power Point 8, Oct. 18 - Department of Physics | Oregon State
... built by Galileo in 1609. It used a convex objective lens, and a diverging lens as the eyepiece. In 1611 Kepler invented another type that uses two convex lenses. The “Keplerian telescope” became far more popular than the “Gallilean” one, and is still widely used today – so we will discuss only the ...
... built by Galileo in 1609. It used a convex objective lens, and a diverging lens as the eyepiece. In 1611 Kepler invented another type that uses two convex lenses. The “Keplerian telescope” became far more popular than the “Gallilean” one, and is still widely used today – so we will discuss only the ...
1” “Sky-Notes” of the Open University Astronomy Club. April 2006. 1
... The disc appears distinctly flattened - equatorial diameter greater than the polar diameter. The equatorial bulge is due to Jupiter's very rapid rotation of under 10 hours. Even a short observing session of half an hour will show the rapid rotation of surface features. The main cloud belts are easil ...
... The disc appears distinctly flattened - equatorial diameter greater than the polar diameter. The equatorial bulge is due to Jupiter's very rapid rotation of under 10 hours. Even a short observing session of half an hour will show the rapid rotation of surface features. The main cloud belts are easil ...
Lect15-3-23-11-stars..
... reached the main sequence for the Pleiades cluster. The previous slide indicates that only stars of about one solar mass or more have had time to reach the main sequence by now. ...
... reached the main sequence for the Pleiades cluster. The previous slide indicates that only stars of about one solar mass or more have had time to reach the main sequence by now. ...
1 - ESO
... • For a variety of reasons, total disk mass is best measured at submillimeter wavelengths. But tau, which is a measure of far-IR excess emission, is much easier to measure and has been determined for an order of magnitude more stars than has dust mass. ...
... • For a variety of reasons, total disk mass is best measured at submillimeter wavelengths. But tau, which is a measure of far-IR excess emission, is much easier to measure and has been determined for an order of magnitude more stars than has dust mass. ...
Earth Science
... which large stars formed. • Other elements formed in large stars. Stars used up their early fuel, and some larger ones exploded. • These explosions formed large clouds of gas and dust. • From such clouds, a solar system with a star, planets, and other bodies of different sizes could form. ...
... which large stars formed. • Other elements formed in large stars. Stars used up their early fuel, and some larger ones exploded. • These explosions formed large clouds of gas and dust. • From such clouds, a solar system with a star, planets, and other bodies of different sizes could form. ...
Volume 4 (Issue 3), March 2015
... and 4 November they observed meteors from sites 15.2 km apart, giving them a useful ‘baseline’, and made 402 measurements; in 22 cases they found that the same meteor had been seen from each site, and its track plotted. This made it possible to determine the height of the meteor by the method of tri ...
... and 4 November they observed meteors from sites 15.2 km apart, giving them a useful ‘baseline’, and made 402 measurements; in 22 cases they found that the same meteor had been seen from each site, and its track plotted. This made it possible to determine the height of the meteor by the method of tri ...
Celebrating the centennial of a celestial yardstick
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
... had abundant volcanic activity (and may have some ongoing activity today), which is involved in concentrating such elements. Yet the amounts of these elements, their distribution, and many other factors are completely unknown. The MESSENGER spacecraft is studying Mercury’s composition from orbit, bu ...
Section 4
... Since then, astronomers have discovered more than 100 planets around other stars, and new ones are being discovered all of the time. Most of these new planets are very large, with at least half of the mass of Jupiter. A small planet would be hard to detect because it would have little gravitational ...
... Since then, astronomers have discovered more than 100 planets around other stars, and new ones are being discovered all of the time. Most of these new planets are very large, with at least half of the mass of Jupiter. A small planet would be hard to detect because it would have little gravitational ...
Chapter 1 Seeing the Light: The Art and Science of Astronomy
... and Saturn. These celestial bodies aren’t wandering through the stars; they orbit around the Sun, our solar system’s central star. Today astronomers know that planets can be smaller or bigger than Earth, but they all are much smaller than the Sun. The planets in our solar system are so close to Eart ...
... and Saturn. These celestial bodies aren’t wandering through the stars; they orbit around the Sun, our solar system’s central star. Today astronomers know that planets can be smaller or bigger than Earth, but they all are much smaller than the Sun. The planets in our solar system are so close to Eart ...
α Cen A + iodine cell spectrum - Department of Physics and Astronomy
... Stable planetary orbits must be within 2 or 3 A.U. of each star and coplanar with the binary star orbit, i = 79°. ...
... Stable planetary orbits must be within 2 or 3 A.U. of each star and coplanar with the binary star orbit, i = 79°. ...
Star evolution - El Camino College
... • What kind of pressure resists gravity? – _______________________pressure ...
... • What kind of pressure resists gravity? – _______________________pressure ...
Coordinate Systems
... not having a leap year, unless that year is divisible by 400 (1600 and 2000 were leap years). ...
... not having a leap year, unless that year is divisible by 400 (1600 and 2000 were leap years). ...
Supplementary Information
... the limit of a thin and extended disk. The smearing due to the instrumental resolution in the spatial and spectral domains is taken into account by convolving the inclined model with the Gaussian point spread function of the appropriate width. The outputs of each model are full data cubes and veloci ...
... the limit of a thin and extended disk. The smearing due to the instrumental resolution in the spatial and spectral domains is taken into account by convolving the inclined model with the Gaussian point spread function of the appropriate width. The outputs of each model are full data cubes and veloci ...
HW1-6
... changeable objects must be earthly. Since this star just suddenly appeared, the old system said it must be earthly (under the sphere of the moon). Tycho’s observations indicated that the star could not be close. If it were close, it would have shifted (parallax). ...
... changeable objects must be earthly. Since this star just suddenly appeared, the old system said it must be earthly (under the sphere of the moon). Tycho’s observations indicated that the star could not be close. If it were close, it would have shifted (parallax). ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.