How Far Can You See?
... Keep looking around and you’ll spot another astronomical object you can see during the day: the Sun. At an average distance of about 93 million miles, the Sun is about 400 times farther away than the Moon. After the Sun sets, your sightline increases drastically. The farthest planet easily visible t ...
... Keep looking around and you’ll spot another astronomical object you can see during the day: the Sun. At an average distance of about 93 million miles, the Sun is about 400 times farther away than the Moon. After the Sun sets, your sightline increases drastically. The farthest planet easily visible t ...
Due Date: Thursday, November 16, 2006
... (Hint: What particles that are generated by the fusion of hydrogen can escape from the interior of the Sun immediately?) You won’t be able to see any changes on the surface of the Sun…probably you won’t see anything from helioseismology data either. This is because photons generated in the core of t ...
... (Hint: What particles that are generated by the fusion of hydrogen can escape from the interior of the Sun immediately?) You won’t be able to see any changes on the surface of the Sun…probably you won’t see anything from helioseismology data either. This is because photons generated in the core of t ...
hw5
... distance to and proper motion of stars to find their perpendicular velocity. For example, we know that the sun is ~ 8.5 kpc from the center of the galaxy and it has an orbital period around the galaxy of ~ 240 x 106 years. We can use Kepler's law to estimate the mass of the galaxy interior to the su ...
... distance to and proper motion of stars to find their perpendicular velocity. For example, we know that the sun is ~ 8.5 kpc from the center of the galaxy and it has an orbital period around the galaxy of ~ 240 x 106 years. We can use Kepler's law to estimate the mass of the galaxy interior to the su ...
Document
... e. Which star’s spectrum shows the strongest Balmer lines of Hydrogen? Vega f. Which star’s spectrum most resembles the Sun’s? Centauri g. Which star is the closest (find m-M)? Centauri (m-M = -4.37) h. Which star has the smallest parallax angle? Canopus (m-M = 4.91) i. Which star can’t be seen ...
... e. Which star’s spectrum shows the strongest Balmer lines of Hydrogen? Vega f. Which star’s spectrum most resembles the Sun’s? Centauri g. Which star is the closest (find m-M)? Centauri (m-M = -4.37) h. Which star has the smallest parallax angle? Canopus (m-M = 4.91) i. Which star can’t be seen ...
Eksamination in FY2450 Astrophysics Wednesday June 8
... by fusion processes producing new elements. Such ideas are wrong. Except for white dwarfs and neutron stars, it is only deep inside a star that temperatures and densities are high enough for fusion processes to take place. New elements are produced deep down, afterwards they usually stay there and a ...
... by fusion processes producing new elements. Such ideas are wrong. Except for white dwarfs and neutron stars, it is only deep inside a star that temperatures and densities are high enough for fusion processes to take place. New elements are produced deep down, afterwards they usually stay there and a ...
Math Review - UC Berkeley Astronomy w
... is far more important that you set it up correctly. Can you think of a reason why seconds is not a very useful way to tell someone your age? ...
... is far more important that you set it up correctly. Can you think of a reason why seconds is not a very useful way to tell someone your age? ...
Distances to Stars: Parsecs and Light Years
... units do we use to describe its distance? • 1 parallax-second = 1 parsec = 3.08E+16m =206,265 au. Alpha Centauri is 1.33 parsecs • If 1 au were 1cm, Alpha Centauri at a distance of 1.5 miles • The Light Year = (2.9979E+08 m/sec)*(3.156E+07 sec) = 9.461E+15 m. Alpha Centauri is 4.3 light years away • ...
... units do we use to describe its distance? • 1 parallax-second = 1 parsec = 3.08E+16m =206,265 au. Alpha Centauri is 1.33 parsecs • If 1 au were 1cm, Alpha Centauri at a distance of 1.5 miles • The Light Year = (2.9979E+08 m/sec)*(3.156E+07 sec) = 9.461E+15 m. Alpha Centauri is 4.3 light years away • ...
Star and Sun Properties
... 2. Proxima Centauri is small and has a low temperature compared to other stars. 3. A, The next stage after red giant is a white dwarf. 4. B, ...
... 2. Proxima Centauri is small and has a low temperature compared to other stars. 3. A, The next stage after red giant is a white dwarf. 4. B, ...
Proxima Centauri
Proxima Centauri (Latin proxima, meaning ""next to"" or ""nearest to"") is a red dwarf about 4.24 light-years from the Sun, inside the G-cloud, in the constellation of Centaurus. It was discovered in 1915 by the Scottish astronomer Robert Innes, the Director of the Union Observatory in South Africa, and is the nearest known star to the Sun, although it is too faint to be seen with the naked eye, with an apparent magnitude of 11.05. Its distance to the second- and third-nearest stars, which form the bright binary Alpha Centauri, is 0.237 ± 0.011 ly (15,000 ± 700 AU). Proxima Centauri is very likely part of a triple star system with Alpha Centauri A and B, but its orbital period may be greater than 500,000 years.Because of Proxima Centauri's proximity, its distance from Earth and angular diameter can be measured directly, from which it can be determined that its diameter is about one-seventh of that of the Sun. Proxima Centauri's mass is about an eighth of the Sun's (M☉), and its average density is about 40 times that of the Sun. Although it has a very low average luminosity, Proxima is a flare star that undergoes random dramatic increases in brightness because of magnetic activity. The star's magnetic field is created by convection throughout the stellar body, and the resulting flare activity generates a total X-ray emission similar to that produced by the Sun. The mixing of the fuel at Proxima Centauri's core through convection and its relatively low energy-production rate mean that it will be a main-sequence star for another four trillion years, or nearly 300 times the current age of the universe.Searches for companions orbiting Proxima Centauri have been unsuccessful, ruling out the presence of brown dwarfs and supermassive planets. Precision radial velocity surveys have also ruled out the presence of super-Earths within the star's habitable zone. The detection of smaller objects will require the use of new instruments, such as the James Webb Space Telescope, which is scheduled for deployment in 2018. Because Proxima Centauri is a red dwarf and a flare star, whether a planet orbiting it could support life is disputed. Nevertheless, because of the star's proximity to Earth, it has been proposed as a destination for interstellar travel.