Units of measurement in astronomy | Logarithmic scales of measurement
In astronomy, magnitude is a unitless measure of the brightness of an object in a defined passband, often in the visible or infrared spectrum, but sometimes across all wavelengths. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus. The scale is logarithmic and defined such that a magnitude 1 star is exactly 100 times brighter than a magnitude 6 star. Thus each step of one magnitude is times brighter than the magnitude 1 higher. The brighter an object appears, the lower the value of its magnitude, with the brightest objects reaching negative values. Astronomers use two different definitions of magnitude: apparent magnitude and absolute magnitude. The apparent magnitude (m) is the brightness of an object as it appears in the night sky from Earth. Apparent magnitude depends on an object's intrinsic luminosity, its distance, and the extinction reducing its brightness. The absolute magnitude (M) describes the intrinsic luminosity emitted by an object and is defined to be equal to the apparent magnitude that the object would have if it were placed at a certain distance from Earth, 10 parsecs for stars. A more complex definition of absolute magnitude is used for planets and small Solar System bodies, based on its brightness at one astronomical unit from the observer and the Sun. The Sun has an apparent magnitude of −27 and Sirius, the brightest visible star in the night sky, −1.46. Venus at its brightest is -5. The International Space Station (ISS) sometimes reaches a magnitude of −6. (Wikipedia).
Teach Astronomy - The Magnitude Scale
http://www.teachastronomy.com/ The magnitude scale is defined in such a way as a magnitude difference of five magnitudes corresponds to a factor of a hundred in apparent brightness. Two and a half magnitude difference corresponds to a factor of 10 in apparent brightness. Lower numbers in
From playlist 14. Stars
Astronomy - Ch. 24: Variable Stars (12 of 26) What is "Absolute Magnitude"?
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn the difference between absolute magnitude and apparent magnitude. Next video in this series can be seen at: https://yo
From playlist ASTRONOMY 24 VARIABLE STARS
Astronomy - Ch. 17: The Nature of Stars (14 of 37) Apparent Magnitude: Another Look
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is apparent magnitude. Next video can be seen at: http://youtu.be/-4FYvEx7jyw
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM
Astronomy - Ch. 17: The Nature of Stars (3 of 37) Apparent Magnitude: Example
Visit http://ilectureonline.com for more math and science lectures! In this video I will give examples of the apparent magnitude of the Sun, full moon, Venus, Pluto... Next video can be seen at: http://youtu.be/-REARVFFlgE
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM
Space #3 Apparent vs Absolute Magnitude 1
Year 10 Science Space Apparent and absolute magnitude
From playlist 10 - Physics
Astronomy - Ch. 17: The Nature of Stars (2 of 37) What is Apparent Magnitude?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explains what is apparent magnitude, or apparent brightness, of stars, moons... Next video can be seen at: http://youtu.be/AlvT08vL8_w
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM
Astronomy - Measuring Distance, Size, and Luminosity (18 of 30) Absolute Magnitude
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain and gives examples of absolute magnitude.
From playlist ASTRONOMY 17A MEASURING DISTANCE SIZE LUMINOSITY
Astronomy - Ch. 17: The Nature of Stars (4 of 37) What is Absolute Magnitude?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is absolute magnitude of stars, moons... Next video can be seen at: http://youtu.be/pVId9vK6Aus
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM
Measuring LIGHT in Astronomy ✷ How BRIGHT are stars, really?
Our Socratica Astronomy series is back! Bookmark the playlist here: ✷ https://socratica.link/Astro_Playlist Join our ASTRO email list so we can notify you when new videos go live: ✷ https://snu.socratica.com/astronomy Meet our STELLAR intern Alivia Brown! ✷ https://www.youtube.co
From playlist Astronomy
Astronomy: Viewer's Request: Measuring Distance to Stars #5: Determining Absolute Magnitude
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will answer a viewer's question of “How do we measure distance to stars?” However that question will be answered over the course o
From playlist VIEWER REQUEST VIDEOS: ASTRONOMY
Viewer's Request: Astronomy #8: How to Convert Magnitude to Luminosity?
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 Given: The absolute magnitude of the Sun M=4.88 Find: The Sun's luminosity=? Next video in this series of can be seen at: https://yo
From playlist THE "HOW TO" PLAYLIST
Astronomy - Ch. 24: Variable Stars (11 of 26) The Distance Triad
Visit http://ilectureonline.com for more math and science lectures! To donate: http://www.ilectureonline.com/donate https://www.patreon.com/user?u=3236071 We will learn what I called the “distance triad”. In order to find distance, absolute magnitude, of apparent magnitude; we have to kn
From playlist ASTRONOMY 24 VARIABLE STARS
Astronomy: The Supernova (10 of 10) Type 1A Supernova Used as a Distance Candle
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain how the type 1A supernova helps to determine distances in astronomy.
From playlist ASTRONOMY 20 SUPERNOVA - THE DEATH OF STARS
From playlist Courses and Series
Naked Eye Observations: Crash Course Astronomy #2
Today on Crash Course Astronomy, Phil invites you to head outside and take a look at all the incredible things you can see with your naked eye. Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/products/crashcourse-astronomy-poster -- Chapters: Introd
From playlist Astronomy
Astronomy - Ch. 17: The Nature of Stars (16 of 37) What is Bolometric Magnitude?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is bolometric magnitude. Next video can be seen at: http://youtu.be/9G1_fxI5XIk
From playlist ASTRONOMY 17 STARS AND THE H-R DIAGRAM
Scales of Space | Introductory Astronomy Course 10.01
Welcome to Astronomy: Exploring Time and Space, a course from Professor Impey, a University Distinguished Professor of Astronomy at the University of Arizona. Learn about the foundations of astronomy in this free online course here on YouTube. This video is part of module 10, Cosmology. W
From playlist Introductory Astronomy Module 10: Cosmology
Astronomy - Measuring Distance, Size, and Luminosity (20 of 30) Calculating Distance Using Magnitude
Visit http://ilectureonline.com for more math and science lectures! In this video I find the absolute magnitude of a star that has 10X the luminosity of our Sun.
From playlist ASTRONOMY 17A MEASURING DISTANCE SIZE LUMINOSITY
Forces | Introductory Astronomy Course 4.05
Welcome to Astronomy: Exploring Time and Space, a course from Professor Impey, a University Distinguished Professor of Astronomy at the University of Arizona. Learn about the foundations of astronomy in this free online course here on YouTube. This video is part of module 4, Matter and Rad
From playlist Introductory Astronomy Module 4: Matter and Radiation