The Naked Eye Era
... 2.3 Islamic Astronomy Hipparchus’s sky survey, as incorporated into the work of Ptolemy, ruled unchallenged for a thousand years, but improvements came with the rise of Islamic astronomy in the 10th century AD. The Book of Fixed Stars (see Figure 2.7), written by the Persian astronomer Abd al-Rahman ...
... 2.3 Islamic Astronomy Hipparchus’s sky survey, as incorporated into the work of Ptolemy, ruled unchallenged for a thousand years, but improvements came with the rise of Islamic astronomy in the 10th century AD. The Book of Fixed Stars (see Figure 2.7), written by the Persian astronomer Abd al-Rahman ...
Stellarium Night Sky Search Key Commands Constellations buttons
... Canes Venatici and hit the space bar to center. Slowly zoom in until you see a galaxy in the field of view. Click on the spiral galaxy, hit space bar and zoom in a bit more. i. What is the name of this galaxy? Give its common name, its Messier number and its NGC number. ...
... Canes Venatici and hit the space bar to center. Slowly zoom in until you see a galaxy in the field of view. Click on the spiral galaxy, hit space bar and zoom in a bit more. i. What is the name of this galaxy? Give its common name, its Messier number and its NGC number. ...
Goal: To understand how to find the brightness of stars and what
... how far away it is. • If you know how far away a star is, how bright it appears to be, and what its temperature is, then you can find what its actual brightness is, and with it how big it is (in size, not mass). • Also, as we will see later, from the size and distance you can get other values such a ...
... how far away it is. • If you know how far away a star is, how bright it appears to be, and what its temperature is, then you can find what its actual brightness is, and with it how big it is (in size, not mass). • Also, as we will see later, from the size and distance you can get other values such a ...
Study Guide
... • Stars on the lower left of the H-R Diagram fainter than Main Sequence stars of the same Temperature. – Means they must be smaller in radius. – L-R-T Relation predicts: R ~ 0.01 Rsun (~ size of Earth!) ...
... • Stars on the lower left of the H-R Diagram fainter than Main Sequence stars of the same Temperature. – Means they must be smaller in radius. – L-R-T Relation predicts: R ~ 0.01 Rsun (~ size of Earth!) ...
Interpreting the HR diagram of stellar clusters
... do not all have the same mass: most tend to have masses less than the Sun's, but a few may be much more massive. One reason to concentrate on clusters is the simple fact that all the stars are very nearly the same distance away from us. That means that their apparent brightness (or magnitude) is alm ...
... do not all have the same mass: most tend to have masses less than the Sun's, but a few may be much more massive. One reason to concentrate on clusters is the simple fact that all the stars are very nearly the same distance away from us. That means that their apparent brightness (or magnitude) is alm ...
Astronomy Assignment #1
... Review Questions from the first half of Chapter 13: Lives and Deaths of Stars 1. What fundamental property of stars determines their evolution? Mass is the fundamental property that determines the evolution of stars. The mass of a star determines the central pressure of the star which in turn is the ...
... Review Questions from the first half of Chapter 13: Lives and Deaths of Stars 1. What fundamental property of stars determines their evolution? Mass is the fundamental property that determines the evolution of stars. The mass of a star determines the central pressure of the star which in turn is the ...
What units are used in astronomical photometry?
... Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989 ...
... Telescope) have improved parallax accuracy to 0.001” within a few years. Before 1990, fewer than 10,000 stellar parallaxes had been measured (and only 500 known well), but there are about 10 12 stars in our Galaxy. Space observations made by the European Space Agency with the Hipparcos mission (1989 ...
the May 2017 Newsletter!
... and in fact, the altitude of the SCP in degrees, is the same as the observer’s latitude. People were then able to figure out that, on the equator, the altitude of the SCP is zero degrees, i.e it would lie on the horizon. A discussion about telescope mountings followed, as Michael’s 6 inch telescope ...
... and in fact, the altitude of the SCP in degrees, is the same as the observer’s latitude. People were then able to figure out that, on the equator, the altitude of the SCP is zero degrees, i.e it would lie on the horizon. A discussion about telescope mountings followed, as Michael’s 6 inch telescope ...
ph507lecnote06
... parallaxes of many more stars. Though a poor orbit limited its usefulness, Hipparcos was expected to achieve a precision of about 0.002”. It actually achieved 0.001” for 118,000 stars. The method of trigonometric parallax is important because it is our only direct distance technique for stars. The g ...
... parallaxes of many more stars. Though a poor orbit limited its usefulness, Hipparcos was expected to achieve a precision of about 0.002”. It actually achieved 0.001” for 118,000 stars. The method of trigonometric parallax is important because it is our only direct distance technique for stars. The g ...
Life Cycle of Stars
... Binary star systems are very important references for astronomers: Their orbits allow to determine their masses, which again allows to calculate radius and density. Resulting massluminosity relationship (MLR) can be applied for single stars. ...
... Binary star systems are very important references for astronomers: Their orbits allow to determine their masses, which again allows to calculate radius and density. Resulting massluminosity relationship (MLR) can be applied for single stars. ...
Mapping the Stars
... Do the stars appear to move at night also? Yes All the stars we see at night appear to rotate around which star? Polaris which is the North Star Where is Polaris located? Directly above the Earth’s North Pole. Stars are actually moving in space, but since they are so distant , their movement is hard ...
... Do the stars appear to move at night also? Yes All the stars we see at night appear to rotate around which star? Polaris which is the North Star Where is Polaris located? Directly above the Earth’s North Pole. Stars are actually moving in space, but since they are so distant , their movement is hard ...
Lecture17
... How can this be? They emit less light per square meter than a blue main sequence star, but, they are much, much bigger (more square meters)! ...
... How can this be? They emit less light per square meter than a blue main sequence star, but, they are much, much bigger (more square meters)! ...
THE ORION CONSTELLATION the Great Hunter
... photographed objects in the night sky, and is among the most intensely studied celestial features. The nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarf ...
... photographed objects in the night sky, and is among the most intensely studied celestial features. The nebula has revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. Astronomers have directly observed protoplanetary disks, brown dwarf ...
3Nov_2014
... • We can follow a stars evolution on the HR diagram. • Lower mass stars move on to the main sequence, stay for a while, and eventually move through giant stages before becoming white dwarfs • Higher mass stars move rapidly off the main sequence and into the giant stages, eventually exploding in a su ...
... • We can follow a stars evolution on the HR diagram. • Lower mass stars move on to the main sequence, stay for a while, and eventually move through giant stages before becoming white dwarfs • Higher mass stars move rapidly off the main sequence and into the giant stages, eventually exploding in a su ...
11 - Visual Magnitudes Project
... or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is the process of determining the brightnesses of an unknown star by comparing its brightness ...
... or M44 which lies in the constellation of Cancer, or Pleiades (M45) which lies in the constellation of Taurus. M44 and M45 are the 44th and 45th objects in the catalog compiled by Messier. Visual photometry is the process of determining the brightnesses of an unknown star by comparing its brightness ...
Star Cycle2013
... _____________ that marks the end of a very massive star’s life. When it occurs, the exploding star can outshine all of the other stars in the galaxy in total for several days and may leave behind only a crushed core. ...
... _____________ that marks the end of a very massive star’s life. When it occurs, the exploding star can outshine all of the other stars in the galaxy in total for several days and may leave behind only a crushed core. ...
The Milky Way – A Classic Galaxy
... • Could see the brightest individual stars. Among them, variables of the right color and light variation to show them as Cepheids • Therefore, this was not a nearby nebula around a new star, it was an entire galaxy. • Herschel’s map then could be seen as a map of our own Milky Way Galaxy ...
... • Could see the brightest individual stars. Among them, variables of the right color and light variation to show them as Cepheids • Therefore, this was not a nearby nebula around a new star, it was an entire galaxy. • Herschel’s map then could be seen as a map of our own Milky Way Galaxy ...
Powerpoint
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
... Why is the gas ionized? Remember, takes energetic UV photons to ionize H. Hot, massive stars produce huge amounts of these. Such short-lived stars spend all their lives in the stellar nursery of their birth, so emission nebulae mark sites of ongoing star formation. Many stars of lower mass are form ...
Chapter 28 Stars and Their Characteristics
... • Step 3 - Fusion stops, temperature drops • Step 4 - Core contracts (gravity pulling atoms in) • Step 5 - Increased temperature (more atoms, more collisions) and density in the core reinitiates nuclear fusion, equilibrium is achieved, and the cycle begins again ...
... • Step 3 - Fusion stops, temperature drops • Step 4 - Core contracts (gravity pulling atoms in) • Step 5 - Increased temperature (more atoms, more collisions) and density in the core reinitiates nuclear fusion, equilibrium is achieved, and the cycle begins again ...
Constellations
... • The horizon is the line of the ground for an observer. • A star finder provides a cover that act as the horizon. – You use a different cover depending on your latitude • The planisphere’s wheel turns to set the day and time for the observer. ...
... • The horizon is the line of the ground for an observer. • A star finder provides a cover that act as the horizon. – You use a different cover depending on your latitude • The planisphere’s wheel turns to set the day and time for the observer. ...
center of mass
... 20. In a given volume of space the Red Dwarf (or lower main sequence) stars are the most abundant, however, on many H-R diagrams very few of these stars are plotted. Why? a. Photographic film and CCDs both have low sensitivity to lowenergy red photons. b. They are so very distant that parallax angle ...
... 20. In a given volume of space the Red Dwarf (or lower main sequence) stars are the most abundant, however, on many H-R diagrams very few of these stars are plotted. Why? a. Photographic film and CCDs both have low sensitivity to lowenergy red photons. b. They are so very distant that parallax angle ...
Canis Minor
Canis Minor /ˌkeɪnɨs ˈmaɪnər/ is a small constellation in the northern celestial hemisphere. In the second century, it was included as an asterism, or pattern, of two stars in Ptolemy's 48 constellations, and it is counted among the 88 modern constellations. Its name is Latin for ""lesser dog"", in contrast to Canis Major, the ""greater dog""; both figures are commonly represented as following the constellation of Orion the hunter.Canis Minor contains only two stars brighter than the fourth magnitude, Procyon (Alpha Canis Minoris), with a magnitude of 0.34, and Gomeisa (Beta Canis Minoris), with a magnitude of 2.9. The constellation's dimmer stars were noted by Johann Bayer, who named eight stars including Alpha and Beta, and John Flamsteed, who numbered fourteen. Procyon is the seventh-brightest star in the night sky, as well as one of the closest. A yellow-white main sequence star, it has a white dwarf companion. Gomeisa is a blue-white main sequence star. Luyten's Star is a ninth-magnitude red dwarf and the Solar System's next closest stellar neighbour in the constellation after Procyon. The fourth-magnitude HD 66141, which has evolved into an orange giant towards the end of its life cycle, was discovered to have a planet in 2012. There are two faint deep sky objects within the constellation's borders. The 11 Canis-Minorids are a meteor shower that can be seen in early December.