Star Maps and Constellations (pdf 3.7 Megs)
... Stars are not all the same brightness. The Greek astronomer Hipparchus (160-127 B.C.) invented the scheme of classifying stars by their brightness where the brightest were first magnitude, the next brightest second magnitude, and the faintest visible stars were sixth magnitude. ...
... Stars are not all the same brightness. The Greek astronomer Hipparchus (160-127 B.C.) invented the scheme of classifying stars by their brightness where the brightest were first magnitude, the next brightest second magnitude, and the faintest visible stars were sixth magnitude. ...
The Milky Way - Montgomery College
... • Dense clusters of 50,000 – a million stars • Old (~ 11 billion years), lower-main-sequence stars • Approx. 200 globular clusters in our Milky Way ...
... • Dense clusters of 50,000 – a million stars • Old (~ 11 billion years), lower-main-sequence stars • Approx. 200 globular clusters in our Milky Way ...
1705 Star Charts
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
... The Evening Sky in May 2017 Two bright planets and the brightest stars share the evening sky this May. Soon after sunset golden Jupiter appears in the northeast. Beside Jupiter is Spica, the brightest star in Virgo. Below Jupiter, near the horizon, is orange Arcturus, the brightest star in the nort ...
Asymptotic Giant Branch
... theoretical models calculated for a 1.5 solar mass star with varying mass of the 13C pocket. The solid line corresponds to ⅔ of the standard mass (which is 4×10−6 solar masses). The upper and lower dashed curve represent the envelope of a set of calculations where the 13C pocket mass varied from 1/2 ...
... theoretical models calculated for a 1.5 solar mass star with varying mass of the 13C pocket. The solid line corresponds to ⅔ of the standard mass (which is 4×10−6 solar masses). The upper and lower dashed curve represent the envelope of a set of calculations where the 13C pocket mass varied from 1/2 ...
Magnitude of Stars - What`s Out Tonight?
... Although this movement may seem like it would be unnoticable, it was known by the ancient Egyptians because they took accurate measurements of where stars rose and set over hundreds and thousands of years. The effect of precession is that the Earth’s north pole points to different directions in the ...
... Although this movement may seem like it would be unnoticable, it was known by the ancient Egyptians because they took accurate measurements of where stars rose and set over hundreds and thousands of years. The effect of precession is that the Earth’s north pole points to different directions in the ...
For stars
... Earth’s Orbital Motion The Twelve constellations (some say thirteen) that the Sun moves through during the year are called the zodiac; The view of the night sky changes as Earth moves in its orbit about the Sun. As drawn here, the night side of Earth faces a different set of constellations at diffe ...
... Earth’s Orbital Motion The Twelve constellations (some say thirteen) that the Sun moves through during the year are called the zodiac; The view of the night sky changes as Earth moves in its orbit about the Sun. As drawn here, the night side of Earth faces a different set of constellations at diffe ...
Star Information ppt.
... Binary Star- double star system that orbit each other About half of all stars are in binary systems ...
... Binary Star- double star system that orbit each other About half of all stars are in binary systems ...
ASTROPHYSICS UNIVERSE - Physics
... of two stars orbiting around their centre of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined ...
... of two stars orbiting around their centre of mass. For each star, the other is its companion star. A large percentage of stars are part of systems with at least two stars. Binary star systems are very important in astrophysics, because observing their mutual orbits allows their mass to be determined ...
TRANSIT
... around the World. Our calendar includes Leap Years every 4 years, which allows for a 365.25 day year, which is not quite right. So, we add other adjustments every 200 years and then every thousand years etc, as required. He then explained a large variety of other calendars used or in use throughout ...
... around the World. Our calendar includes Leap Years every 4 years, which allows for a 365.25 day year, which is not quite right. So, we add other adjustments every 200 years and then every thousand years etc, as required. He then explained a large variety of other calendars used or in use throughout ...
Project 4: The HR diagram. Open clusters
... 2. Flat‐fielding: Take all the flat‐field images taken with the same filter, add them together and divide the sum by the mean value of the sum. This will give an averaged flat‐field whose mean is unity. Divide the images by the scaled flat‐field ...
... 2. Flat‐fielding: Take all the flat‐field images taken with the same filter, add them together and divide the sum by the mean value of the sum. This will give an averaged flat‐field whose mean is unity. Divide the images by the scaled flat‐field ...
VERA Project : overview and current status
... Simultaneous observations of two adjacent sources can cancel out atmospheric fluctuation target accuracy : 10 micro-arcsec ! ...
... Simultaneous observations of two adjacent sources can cancel out atmospheric fluctuation target accuracy : 10 micro-arcsec ! ...
Notes (PowerPoint)
... from numerous observations, e.g. “someone broke in and stole the teapot and spoons” o Open window, teapot and spoons missing, palm-print on window, boot marks outside ...
... from numerous observations, e.g. “someone broke in and stole the teapot and spoons” o Open window, teapot and spoons missing, palm-print on window, boot marks outside ...
Diapositiva 1
... Transient strong meridional currents, produced by the tidal action, transfer angular momentum between the stellar interior and the Ekman layer close to the surface. If ω>Ω the star spins down. ...
... Transient strong meridional currents, produced by the tidal action, transfer angular momentum between the stellar interior and the Ekman layer close to the surface. If ω>Ω the star spins down. ...
Astronomy and Survey of Information
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
The Lives of Stars
... Relatively young Population I stars are metal rich; ancient Population II stars are metal poor The metals (heavy elements) in Population I stars were manufactured by thermonuclear reactions in an earlier generation of Population II stars, then ejected into space and incorporated into a later stellar ...
... Relatively young Population I stars are metal rich; ancient Population II stars are metal poor The metals (heavy elements) in Population I stars were manufactured by thermonuclear reactions in an earlier generation of Population II stars, then ejected into space and incorporated into a later stellar ...
Great Observatories
... Replace capabilities? • Technology since 1980: lots cheaper. Thin flexible mirrors, lightweight structures, stabilize mirrors rather than structure… • Unique access to optical/UV range • Plan on table to fly 2.4m mirror with existing HST instruments (Hubble Origins Probe or HOP); could be as low as ...
... Replace capabilities? • Technology since 1980: lots cheaper. Thin flexible mirrors, lightweight structures, stabilize mirrors rather than structure… • Unique access to optical/UV range • Plan on table to fly 2.4m mirror with existing HST instruments (Hubble Origins Probe or HOP); could be as low as ...
Stellar Pops 2
... evolution histories for very large sample of galaxies throughout the Hubble sequence. – Did star formation comence at the same time thoughout the volume of space to the Virgo Cluster? – What are the star-formation histories for gE galaxies? – Is there a Universal `floor’ to the MDF? – Are there IMF ...
... evolution histories for very large sample of galaxies throughout the Hubble sequence. – Did star formation comence at the same time thoughout the volume of space to the Virgo Cluster? – What are the star-formation histories for gE galaxies? – Is there a Universal `floor’ to the MDF? – Are there IMF ...
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.