CLASSIFYING STARS. GOALS Understand how stars are grouped Understand the different ways a star can be named Explain how astronomers classify objects by.

Slides:



Advertisements
Similar presentations
The Sky Astronomy: Horizons 10th edition Michael Seeds.
Advertisements

Astronomical distances The SI unit for length, the meter, is a very small unit to measure astronomical distances. There units usually used is astronomy:
Chapter 2 The Sky.
Stellar Magnitudes and Exponentials. Exponents 5 2 = 5x5= = 6x6x6 = = 7x7x7x7 = = 1/4 2 = 1/16 = =
Basic Properties of Stars - 3
Characteristics of Stars Analyze how stars are classified based on their physical characteristics.
Stars Properties: Brightness and Color Reasons for brightness: Proximity Temperature of star.
Announcements Pick up graded homework Lecture slides on web site have been updated Take the test W, Th, or F before class Physics seminar today, 1:00,
Nature of Stars. Parallax is denoted by ‘p’. Distance (d) is measured in parsec. d = 1 parsec = the distance at which a star has a parallax (p)
Chapter 2: The Sky. Common Units we will use Common Conversions.
Chapter 2 User’s Guide to the Sky: Patterns and Cycles
ASTRONOMY CHAPTER 2: THE NIGHT SKY. THE NIGHT SKY IS THE REST OF THE UNIVERSE AS SEEN FROM OUR PLANET. Beyond our atmosphere is empty space. Our planet.
Lecture 3 – The Sky Constellations, Star Names, and Magnitudes.
The sky modern science was born when people tried to understand the sky (With thanks to Mark Ritter & John Bloom)
Note that the following lectures include animations and PowerPoint effects such as fly-ins and transitions that require you to be in PowerPoint's Slide.
The Sky Chapter 2. Outline I. The Stars A. Constellations B. The Names of the Stars C. The Brightness of Stars D. Magnitude and Intensity II. The Sky.
1.2 THE SKY.
Magnitude, and Intensity Physics 113 Goderya Chapter(s): 2 Learning Outcome:
Stars and Constellations Physics 113 Goderya Chapter(s): 2 Learning Outcome:
Chapter 16 The Nature of Stars Astro1010-lee.com UVU Survey of Astronomy.
THE SKY (Part 1) 1. Objectives To be able to interpret and apply the term “brightness” to stars. To be able to describe how the sky moves with reference.
The Sky.
In p35 1.Where does fusion occur? 2.Why are scientists trying to create fusion on earth?
Astronomy Toolkit  Magnitudes  Apparent magnitude  Absolute magnitude  The distance equation  Luminosity and intensity  Units and other basic data.
Stellar Brightness.  Apparent magnitude: brightness of a star as seen from Earth  The Ancient Greeks put the stars they could see into six groups. 
voisey/constellations/pic/constellation_ map.gif.
Astronomical distances The SI unit for length, the metre, is a very small unit to measure astronomical distances. There units usually used is astronomy:
Brightness + Magnitude of Stars - There are approximately 5000 stars viewable with the unaided eye from the Earth’s surface - At any one position you.
THE SKY CHAPTER 2 (Part 1). Objectives To be able to interpret and apply the term “brightness” to stars. To be able to describe how the sky moves with.
Goal: To understand how to find the brightness of stars and what they mean. Objectives: 1)To learn about Absolute brightness 2)To learn about the Magnitude.
Usually, what we know is how bright the star looks to us here on Earth… We call this its Apparent Magnitude “What you see is what you get…”
Magnitude.
Chapter 2: The Sky. Constellations In ancient times, constellations only referred to the brightest stars that appeared to form groups, representing mythological.
Chapter 22 Stars.
Characteristics of Stars  Parallax is the method used by astronomers to study the distance to relatively nearby stars.  Parallax is the apparent.
Cas Beta – 55ly Alpha- 230ly Gamma- 615ly Delta- 100ly Epsilon- 440ly.
Chapter 27 Stars and Galaxies Section 1 Characteristics of Stars Notes 27-2.
STARS  Stars form when clouds of gases (mainly hydrogen) are pulled together by gravitational forces.  Atomic explosions occur inside stars. –They are.
Unit 1 Physics Detailed Study 3.2 Chapter 11: Astrophysics.
Stars! A star is a big ball of gas, with fusion going on at its center, held together by gravity! Massive Star Sun-like Star Low-mass Star There are variations.
The Expanding Universe. Basic Properties of Stars Magnitude Measuring the Stars –One of the most basic observable properties of a star is how bright it.
1. Where are we ? -In the Universe In the Solar System 3 rd planet from the Sun.
The previous chapter took you on a cosmic zoom through space and time. That quick preview only sets the stage for the drama to come. Now it is time to.
Characteristics of Stars There are millions of stars in the universe, but they are very far apart. Because of this, distances between stars are measured.
Chapter 1 Charting the Heavens: The Foundations of Astronomy.
Carpecaelum.com. Stellar Astronomy Cataloging the Stars.
By: Cassidy Osborne. Proxima means closest because it is the star closest to the sun. Proxima is about 23 trillion miles away from Earth.
The Distances of Stars. It Sounds Easy! [read the last three lines]
Mapping the Celestial sphere Locating stars and deep space objects.
The Night Sky. Big Questions: What do we see when we look at the night sky with the naked eye? How are stars named? Why is the apparent magnitude of stars.
The Constellations VideoVideo
Notes 1-3: Observing the sky with the naked eye 1/9/09.
Chapter2:User’s Guide to The Sky : Patterns and Cycles.
College Algebra Chapter 4 Exponential and Logarithmic Functions Section 4.3 Logarithmic Functions.
Dr Paul A DanielsGuildford Astronomical Society1.
The Sky.
Celestial Sphere Remember that we are on the INSIDE of the
The Constellations Video
Astronomy Stars.
Chapter 1: The Scale of the Cosmos
Usually, what we know is how bright the star looks to us here on Earth… We call this its Apparent Magnitude “What you see is what you get…”
Stars that look brighter to us on Earth
The Sky.
Stars.
Stellar Astronomy Cataloging the Stars Star Names Proper Names Bayer Greek letters Flamsteed numbering system Henry Draper HD numbers S.A.O. numbers.
Flux Density Spectral Energy Density.
Luminosity (A.K.A.: Brightness).
Origins of Constellations
Goals Explain how we measure stellar distances Explain the difference between apparent and absolute brightness Explain how we classify stars Describe the.
Ch Stars Chapter 19, Section 1 Part 2.
Presentation transcript:

CLASSIFYING STARS

GOALS Understand how stars are grouped Understand the different ways a star can be named Explain how astronomers classify objects by apparent brightness

CONSTELLATIONS Semi-rectangular regions of the sky with definite boundaries

CONSTELLATIONS 88 official constellations. Cover the entire sky Every star is part of one constellation

CONSTELLATIONS

NAMES OF STARS Common Names Many bright stars have ancient names Usually of Arabic, Greek or Latin origin Examples Betelgeuse Achernar

NAMES OF STARS The Bayer System (1603) Greek + possessive form of the Letterconstellation Greek letters assigned in order of brightness – Alpha (α) = brightest star – Beta (β) = second brightest

NAMES OF STARS Flamsteed System (1712) Number +possessive form of the constellation Number stars from west to east

NAMES OF STARS Example Common NameDeneb ConstellationCygnus Bayer NameAlpha Cygni Flamsteed Name50 Cygni

BRIGHTNESS OF STARS The Magnitude Scale – brightness scale Stars divided into six brightness groups – The brightest = first-magnitude stars – The faintest = sixth-magnitude stars

BRIGHTNESS OF STARS Apparent Visual Magnitude (m V ) A measure of the brightness as seen by human eyes on Earth. Does not take into account star’s distance from Earth

BRIGHTNESS OF STARS Apparent Visual Magnitude (m V ) Non-linear scale 1 magnitude = 2.5 times brighter Backwards Smaller magnitude = brighter

BRIGHTNESS OF STARS Differences in the scales 1.Star magnitudes can have decimal values. 2.The brightest stars have negative magnitudes 3.Telescopes allow one to view dimmer stars. The magnitude system was extended beyond the 6 th magnitude

GOALS - SUMMARIZE Understand how stars are grouped Understand the different ways a star can be named Explain how astronomers classify objects by apparent brightness

CONCEPT CHECK 1.If Jupiter is reported to be in the constellation of Taurus the Bull, does Jupiter need to be within the outline of the bull’s body? Why or why not? 2.Which constellation can Alpha Centauri be found in? 3.The star Zubenelgenubi has a apparent magnitude of 2.75, while Sulafat has an apparent magnitude of Which star appears brighter?

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.