Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 3, Problem 5RQ
To determine
The origin of magnitude system of classification of stars by its apparent 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
Consider 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?
Chapter 3 Solutions
Foundations of Astronomy (MindTap Course List)
Ch. 3 - Why are most of the constellations that were...Ch. 3 - Prob. 2RQCh. 3 - Which is the asterism and which is the...Ch. 3 - Prob. 4RQCh. 3 - Prob. 5RQCh. 3 - What does the word apparent mean in apparent...Ch. 3 - Prob. 7RQCh. 3 - Prob. 8RQCh. 3 - Prob. 9RQCh. 3 - Could a solar powered spacecraft generate any...
Ch. 3 - If a lunar eclipse occurred at midnight, where in...Ch. 3 - If Earth had no atmosphere, what color would the...Ch. 3 - If the Moon orbited Earth from North Pole to South...Ch. 3 - Why do solar eclipses happen only at new moon? Why...Ch. 3 - Why isnt the corona visible during partial or...Ch. 3 - Which has the larger angular diameter in the...Ch. 3 - What is the angular diameter of the Moon in the...Ch. 3 - Why cant the Moon be eclipsed when it is halfway...Ch. 3 - Why are solar eclipses separated by one Saros...Ch. 3 - How could Thales of Miletus have predicted the...Ch. 3 - Will an eclipse occur in February 2025? In July...Ch. 3 - How do we know? Some people think science is like...Ch. 3 - Pretend the Moons orbit around Earth is a perfect...Ch. 3 - Identify the phases of the Moon if on March 20 the...Ch. 3 - Identify the phases of the Moon if at sunset in...Ch. 3 - What fraction of the Moons surface area is the far...Ch. 3 - About how many days must elapse between...Ch. 3 - Tonight you see a waning crescent in the night...Ch. 3 - If on March 1 the Moon is full and is near Famous...Ch. 3 - How many times larger than the Moon is the...Ch. 3 - Use the small-angle formula to calculate the...Ch. 3 - Prob. 10PCh. 3 - At perigee, the Moon is closer than average by...Ch. 3 - Examine the list of upcoming lunar eclipses in...Ch. 3 - Prob. 13PCh. 3 - If a solar eclipse occurs on October 3: (a) Why...Ch. 3 - A total eclipse of the Sun was visible from Canada...Ch. 3 - Prob. 16PCh. 3 - When will the eclipse seasons occur during the...Ch. 3 - Examine Figure 3-16. List the letter S for each...Ch. 3 - Arrange the following in order of increasing...Ch. 3 - Prob. 2SOPCh. 3 - Look at the Chapter 2 Concept Art: The Sky Around...Ch. 3 - To take the photos that are combined on the...Ch. 3 - Look at the Chapter 3 Concept Art: The Phases of...Ch. 3 - Look at the Chapter 3 Concept Art: The Phases of...Ch. 3 - Use the photos in Figure 3-1 as evidence to show...Ch. 3 - Prob. 6LTLCh. 3 - Prob. 7LTLCh. 3 - Prob. 8LTLCh. 3 - What evidence of the Saros cycle can you see in...Ch. 3 - The accompanying cartoon shows a crescent moon....Ch. 3 - This photo shows the annular eclipse of May 30,...
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- Describe two ways of determining the diameter of a star.arrow_forwardExplain 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_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_forward
- Use 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_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_forwardHow do you calculate the mass of a star?arrow_forward
- Verify 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_forwardIs the Sun an average star? Why or why not?arrow_forwardThe star Antares has an apparent magnitude of 1.0, whereas the star Procyon has an apparent magnitude of 0.4. Which star appears brighter in the sky?arrow_forward
- Review this spectral data for five stars. Which is the hottest? Coolest? Most luminous? Least luminous? In each case, give your reasoning.arrow_forward15: 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 star is observed to cross the meridian at an elevation of 67°, as seen from an observatory at a latitude of 52° north. What is the declination of the star? What would be the declination of a star observed to transit at an elevation of 20°?arrow_forward
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