Stellar Magnitudes and Distances
... How do you do the math? • Take the difference in magnitudes between two stars. • Raise 2.512 to that power. • Example: How many times brighter is Polaris (a 2nd magnitude star) than a barely-visible 6th magnitude star? • 6 - 2 = 4. So 2.5124 = 39.8 times. Polaris is almost 40 times brighter than th ...
... How do you do the math? • Take the difference in magnitudes between two stars. • Raise 2.512 to that power. • Example: How many times brighter is Polaris (a 2nd magnitude star) than a barely-visible 6th magnitude star? • 6 - 2 = 4. So 2.5124 = 39.8 times. Polaris is almost 40 times brighter than th ...
Astronomy Assignment #1
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
... The diameter of Alpha Centauri A is 1.71 x 109 meters. The Sun’s diameter is 1.39 x 109 meters as determined from the table in the text’s appendix. Thus, Alpha Centauri A is slightly larger than the Sun with a diameter of 1.23 solar diameters. Alpha Centauri B is (60/85) = 0.706 times smaller than A ...
What is a Star?
... Our Sun • Apparent magnitude of our sun is 26.4, because it is so close. – If it were further from us, it would look much dimmer. ...
... Our Sun • Apparent magnitude of our sun is 26.4, because it is so close. – If it were further from us, it would look much dimmer. ...
Winter 2014
... Earth, which is why it appears so bright. Sometimes called the “Dog Star,” Sirius is a part of the constellation Canis Major, the Big Dog. While many stars in our night sky appear white primarily because our eyes are poor at detecting color in low-light conditions, Sirius is actually white in color. ...
... Earth, which is why it appears so bright. Sometimes called the “Dog Star,” Sirius is a part of the constellation Canis Major, the Big Dog. While many stars in our night sky appear white primarily because our eyes are poor at detecting color in low-light conditions, Sirius is actually white in color. ...
Chapter 09 - The Independent School
... of stars, astronomers must use their telescopes and spectrographs in ingenious ways to learn the secrets hidden in starlight. The result is a family portrait of the stars. Here you will find answers to five essential questions about stars: • How far away are the stars? • How much energy do stars mak ...
... of stars, astronomers must use their telescopes and spectrographs in ingenious ways to learn the secrets hidden in starlight. The result is a family portrait of the stars. Here you will find answers to five essential questions about stars: • How far away are the stars? • How much energy do stars mak ...
Lab 6
... class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to be seen within another galaxy. Leavitt determined that absolute magnitude (M) of a Cepheid variable was mathematically related to the period (P, measured in days) of its bright ...
... class of variable stars called the Cepheids. These stars vary in brightness in a cyclical pattern, and are bright enough to be seen within another galaxy. Leavitt determined that absolute magnitude (M) of a Cepheid variable was mathematically related to the period (P, measured in days) of its bright ...
'Astronomy of the first people of Australia'. (PDF, 593.53 KB
... MIRRABOOKA - THE SOUTHERN CROSS ...
... MIRRABOOKA - THE SOUTHERN CROSS ...
The Marathon
... We'll now slowly move toward the summer time objects. Moving 15° south of M104 is the globular cluster M68 in Hydra. Following the path of Hydra's tail leads us to the magnitude 3.0 star Gamma Hydrae. Moving 6° to the south leads you to M83, which is one of the intrinsically brightest galaxies known ...
... We'll now slowly move toward the summer time objects. Moving 15° south of M104 is the globular cluster M68 in Hydra. Following the path of Hydra's tail leads us to the magnitude 3.0 star Gamma Hydrae. Moving 6° to the south leads you to M83, which is one of the intrinsically brightest galaxies known ...
Star Birth: The Formation of Stars Jonathan Rowles
... A star is a luminous ball of gas. They produce energy by the nuclear fusion of hydrogen to form helium. They range in size from 0.08 times the mass of the Sun to up to 120 Solar masses. They can have lifetimes ranging from a few million years to the age of the universe. ...
... A star is a luminous ball of gas. They produce energy by the nuclear fusion of hydrogen to form helium. They range in size from 0.08 times the mass of the Sun to up to 120 Solar masses. They can have lifetimes ranging from a few million years to the age of the universe. ...
Constellation ARA
... Ara contains several notable deep sky objects: the Stingray Nebula, the open cluster NGC 6193 and the globular cluster NGC 6397. NGC 6193 is a large open cluster that contains 27 stars, many of them binaries. The cluster lies eight degrees west and one degree north of Alpha Arae. Its estimated age i ...
... Ara contains several notable deep sky objects: the Stingray Nebula, the open cluster NGC 6193 and the globular cluster NGC 6397. NGC 6193 is a large open cluster that contains 27 stars, many of them binaries. The cluster lies eight degrees west and one degree north of Alpha Arae. Its estimated age i ...
Station A Star Charts I
... D6. (2 pts) When modern astronomers redesigned the magnitude system, they set the scale so that every five magnitudes is 100 times brighter (or dimmer, depending on direction). If star A is 1 magnitude brighter than star B, how many times brighter is it? Give your answer to the nearest thousandth. ...
... D6. (2 pts) When modern astronomers redesigned the magnitude system, they set the scale so that every five magnitudes is 100 times brighter (or dimmer, depending on direction). If star A is 1 magnitude brighter than star B, how many times brighter is it? Give your answer to the nearest thousandth. ...
The Night Sky This Month - Usk Astronomical Society
... A syzygy is when three interacting celestial bodies form a straight line, and is used to define either of the two positions (conjunction or opposition) of a celestial body when sun, earth, and the body lie in a straight line: the moon is at syzygy when full and again when new. The correct astronomic ...
... A syzygy is when three interacting celestial bodies form a straight line, and is used to define either of the two positions (conjunction or opposition) of a celestial body when sun, earth, and the body lie in a straight line: the moon is at syzygy when full and again when new. The correct astronomic ...
Small Wonders: Ursa Minor
... from the showing true north. Not only that, but the relationship between North and the North Star is constantly changing. Because of a phenomenon known as precession, (basically a wobble of earth along it's axis - much like a top) the northern pole carves out a 47 degree diameter circle on the nigh ...
... from the showing true north. Not only that, but the relationship between North and the North Star is constantly changing. Because of a phenomenon known as precession, (basically a wobble of earth along it's axis - much like a top) the northern pole carves out a 47 degree diameter circle on the nigh ...
IMR_Star Theater
... If you look at the stars in the night sky long enough, you will notice how groups of stars form familiar objects, something like connect-the-dots pictures. Many centuries ago, people who gazed at the stars noticed pictures out there— and gave names to them. This helped them create a “map” of the nig ...
... If you look at the stars in the night sky long enough, you will notice how groups of stars form familiar objects, something like connect-the-dots pictures. Many centuries ago, people who gazed at the stars noticed pictures out there— and gave names to them. This helped them create a “map” of the nig ...
SMMP_BISANA - Infinity and Beyond
... both its distance and how bright the star actually is. The brightness of a star can be described in 2 different ways: apparent brightness and absolute brightness. A star’s apparent brightness is its brightness as seen from Earth. Astronomers can measure apparent brightness easily, using devices simi ...
... both its distance and how bright the star actually is. The brightness of a star can be described in 2 different ways: apparent brightness and absolute brightness. A star’s apparent brightness is its brightness as seen from Earth. Astronomers can measure apparent brightness easily, using devices simi ...
Basic Properties of Stars
... Note: T increases to left and bright stars at the top. Band upper left to lower right is called the Main Sequence. It contains 8090% of all stars. White dwarfs at lower left. ...
... Note: T increases to left and bright stars at the top. Band upper left to lower right is called the Main Sequence. It contains 8090% of all stars. White dwarfs at lower left. ...
Problem Set 2
... ring’s radius in parcsec? Recall from class that the ring’s angular radius is the projected ellipse’s semi-major axis. What is the distance d to the supernova? Finally, at its brightest, SN1987A had an apparent magnitude of mV ≈ 3 mag. What was its peak absolute magnitude? Given that the Sun has an ...
... ring’s radius in parcsec? Recall from class that the ring’s angular radius is the projected ellipse’s semi-major axis. What is the distance d to the supernova? Finally, at its brightest, SN1987A had an apparent magnitude of mV ≈ 3 mag. What was its peak absolute magnitude? Given that the Sun has an ...
luminosities
... your study of the billions of stars that dot the sky. In a sense, the star is the basic building block of the universe. If you hope to understand what the universe is and how it works, you must understand the stars. ...
... your study of the billions of stars that dot the sky. In a sense, the star is the basic building block of the universe. If you hope to understand what the universe is and how it works, you must understand the stars. ...
luminosities
... These are related to the actual motion of the stars throughout the Milky Way, and are called proper motion. ...
... These are related to the actual motion of the stars throughout the Milky Way, and are called proper motion. ...
Warm-Up Monday, July 23, 2012
... Orion is a constellation- a group of stars in the sky. Pick the best statement that you think describes the stars in Orion. • A. The stars of Orion are closer together in space. • B. The stars in Orion orbit the Sun, just like the planets. • C. The brightest stars in Orion are the ones that are clos ...
... Orion is a constellation- a group of stars in the sky. Pick the best statement that you think describes the stars in Orion. • A. The stars of Orion are closer together in space. • B. The stars in Orion orbit the Sun, just like the planets. • C. The brightest stars in Orion are the ones that are clos ...
Double Stars in Scorpio`s Claws
... stars that are a rewarding challenge to any astronomer. Some of these are actual double stars (pairs of stars that orbit about each other), others are ‘apparent doubles’ – stars that simply lie along the same line of sight, but are very distant from each other in space. The map below indicates the l ...
... stars that are a rewarding challenge to any astronomer. Some of these are actual double stars (pairs of stars that orbit about each other), others are ‘apparent doubles’ – stars that simply lie along the same line of sight, but are very distant from each other in space. The map below indicates the l ...
CONSTELLATION CEPHEUS, KING OF ETHIOPIA Cepheus is a
... descent from the nymph Io, one of the loves of Zeus – and having Zeus as a relative was always an advantage when it came to being commemorated among the constellations. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. ...
... descent from the nymph Io, one of the loves of Zeus – and having Zeus as a relative was always an advantage when it came to being commemorated among the constellations. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. ...
Globular Clusters
... will start to resolve it, and in a 6" scope or bigger, on a good night, it will resolve into a spectacular cluster of stars stretching far from the bright core. This is another big one. Unfortunately 47 Tuc does not easily resolve into stars with smaller scopes. The Pavo glob and M22 are a bit easie ...
... will start to resolve it, and in a 6" scope or bigger, on a good night, it will resolve into a spectacular cluster of stars stretching far from the bright core. This is another big one. Unfortunately 47 Tuc does not easily resolve into stars with smaller scopes. The Pavo glob and M22 are a bit easie ...
Photometric analysis of the globular cluster NGC5466
... bright blue stars are identified. Most of the open clusters lay in the Galactic disc and have a large quantity of interstellar medium. Globular clusters, instead, are characterized by a spherical shape, due to tight gravitational bounds. They present a high star density, which decreases as the dista ...
... bright blue stars are identified. Most of the open clusters lay in the Galactic disc and have a large quantity of interstellar medium. Globular clusters, instead, are characterized by a spherical shape, due to tight gravitational bounds. They present a high star density, which decreases as the dista ...
Slides from Lecture04
... extending it to much fainter objects (that are visible through telescopes but were not bright enough to be seen by Greek astronomers). • The Sun can also be put on this “magnitude” system. ...
... extending it to much fainter objects (that are visible through telescopes but were not bright enough to be seen by Greek astronomers). • The Sun can also be put on this “magnitude” system. ...
Crux
Crux /ˈkrʌks/, located in the deep southern sky, is the smallest yet one of the most distinctive of the 88 modern constellations. Its name is Latin for cross, and it is dominated by a cross-shaped asterism that is commonly known as the Southern Cross. Although visible to the Ancient Greeks, it was seen as part of the constellation Centaurus, and not defined or accurately mapped till the 16th century.Known as Acrux, blue-white Alpha Crucis is the constellation's brightest star and the bottom star of the cross. Nearly as bright are Beta and Gamma, while Delta and Epsilon make up the asterism. Many of the constellation's brighter stars are members of the Scorpius–Centaurus Association, a loose group of hot blue-white stars that appear to share a common origin and motion across the Milky Way. Two star systems have been found to have planets. The constellation also contains four Cepheid variables visible to the naked eye under optimum conditions. Crux also contains the Jewel Box, a bright open cluster, and the Coalsack Nebula, the most prominent dark nebula in the sky.