Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 2, Problem 6RQ
To determine
How the magnitude system originated in a classification of stars by brightness.
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Which of the following is least reasonable regarding the magnitude scale:
Group of answer choices
The numerical difference between a star's absolute and apparent magnitudes is a measure of the distance to the star.
If the Sun were moved to a distance of 10 parsecs, its apparent magnitude would be about 4.8 and it would therefore not be visible to the naked eye.
The fact that Sun's absolute magnitude of 4.8 is greater than the Sun's apparent magnitude of -27 implies that the Sun is a lot closer than 10 parsecs.
Apparent magnitude measures a star's apparent brightness when viewed at the star's actual distance from the observer.
A star's absolute magnitude is its apparent magnitude when viewed from a distance of 10 parsecs.
I need help please
Please answer them:)
Hey! As you can see, there is an image wherein the question is cut of. Here is the question:
Which of the following statements is CORRECT in terms of the star's absolute magnitude??
Chapter 2 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 2 - Why have astronomers added modern constellations...Ch. 2 - What is the difference between asterism d a...Ch. 2 - What characteristic do starts in a constellation...Ch. 2 - Do people from other cultures on Earth see the...Ch. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - What does the word apparent mean in apparent...Ch. 2 - In what ways is the celestial sphere a scientific...Ch. 2 - Why do astronomers use the word on to describe...Ch. 2 - Earth did not rotate, could you define the...
Ch. 2 - Where would you go on Earth if you wanted to be...Ch. 2 - Prob. 12RQCh. 2 - Explain h to make a simple astronomical...Ch. 2 - 14. Why does the number of circumpolar...Ch. 2 - How could you detect Earths precession t examining...Ch. 2 - How Do We know? How can a scientific model be...Ch. 2 - Using stars from one or more of the “official”...Ch. 2 - Prob. 2DQCh. 2 - Prob. 1PCh. 2 - If two stars differ by 8.6 magnitudes, what is...Ch. 2 - Prob. 3PCh. 2 - By what factor is sunlight brighter than...Ch. 2 - If you are at a latitude of 35° north of Earths...Ch. 2 - Prob. 1LTLCh. 2 - Prob. 2LTL
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- Explain the origin of the magnitude designation for determining the brightness of stars. Why does it seem to go backward, with smaller numbers indicating brighter stars?arrow_forwardDescribe two ways of determining the diameter of a star.arrow_forwardVerify that if two stars have a difference of five magnitudes, this corresponds to a factor of 100 in the ratio (b2b1) ; that 2.5 magnitudes corresponds to a factor of 10; and that 0.75 magnitudes corresponds to a factor of 2.arrow_forward
- Is the Sun an average star? Why or why not?arrow_forwardDo stars that look brighter in the sky have larger or smaller magnitudes than fainter stars?arrow_forwardConsider two identical stars, A and B. Star B is 10 times farther away than star A. What is the difference in magnitudes between the two stars?arrow_forward
- 15: A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. What is the distance to this star? Answer: 37 16: What is the absolute magnitude of this star? Answer:1.8 17: Is this star more or less luminous than the Sun? Answer "M" for More luminous or "L" for Less luminous. (HINT: the absolute magnitude of the Sun is 4.8) Answer: M 18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.) Please answer question #18, #15-17 are correct, the photos provide the work for them.arrow_forwardA line drawn from the 2 pointer stars that points towards which famous and important second magnitude star in Ursa Minor? Vega Sirius Polaris Peocyonarrow_forwardUse a diagram to explain what is meant by the parallax angle, p, for a star observed twice from Earth, with a 6-month interval between each observation. Hence define the parsec, and calculate its value in astronomical units and metres. The star Betelgeuse is observed to have a parallax angle p = 4.5 × 10−3 arcseconds. State the distance of Betelgeuse in units of parsecs and light years.arrow_forward
- How do you calculate the mass of a star?arrow_forwardConsider two identical stars, A and B. Star B is 10 times farther away than star A. What is the differencein magnitudes between the two stars?arrow_forwardThe figure below shows the radial velocity of a star plotted as a function of time over the course of 20 days. Where is the planet in its orbit around the star when the star's radial velocity is 18 km/s? How do I determine this?arrow_forward
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