Stars and Galaxies (MindTap Course List)
10th Edition
ISBN: 9781337399944
Author: Michael A. Seeds
Publisher: Cengage Learning
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Question
Chapter 2, Problem 8RQ
To determine
Whether apparent visual magnitude can identify the farther star among two.
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I am trying to plot the ground tracks of an orbit. But I am having a problem with finding the longitude. The equation for the longitude is shown in the image. Is the Theta GMST initially zero because the greenwich meridian points to the Aries point (x-axis). How do you calculate alpha or vernal equinox? I saw a formula for alpha which is alpha = arctan(ry/rx), but the formula was for Right Ascension angle. Is the right ascension angle the same as vernal equinox. If not, then what is the formula for vernal equinox.
Review Conceptual Example 3 for information pertinent to this problem. When we look at a particular star, we are seeing it as it was 307 years ago. How far away from us (in meters) is the star? Take a year to be 365.25 days.
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 2 Solutions
Stars and Galaxies (MindTap Course List)
Ch. 2 - Prob. 1RQCh. 2 - Prob. 2RQCh. 2 - Prob. 3RQCh. 2 - Prob. 4RQCh. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Prob. 13RQCh. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 20RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 23RQCh. 2 - Prob. 24RQCh. 2 - Prob. 25RQCh. 2 - Prob. 26RQCh. 2 - Prob. 27RQCh. 2 - Prob. 28RQCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - What is the angular distance from the north...Ch. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Arrange the following in order of increasing...Ch. 2 - Arrange the following in order of increasing...Ch. 2 - Find the Big Dipper in the star trails photograph...Ch. 2 - Look at The Sky Around You, item 1a. In the...Ch. 2 - Prob. 3LLCh. 2 - Prob. 4LL
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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_forwardLook at The Sky Around You, item 1a. In the looking south illustration, is Canis Major a circumpolar constellation? Why or why not?arrow_forwardWhat is a constellation as astronomers define it today? What does it mean when an astronomer says, “I saw a comet in Orion last night”?arrow_forward
- Ursa Minor contains the pole star, Polaris, and the asterism known as the Little Dipper. From most locations in the Northern Hemisphere, all of the stars in Ursa Minor are circumpolar. Does that mean these stars are also above the horizon during the day? Explain.arrow_forwardIn what ways is the celestial sphere a scientific model?arrow_forwardAs seen from Earth, the Sun has an apparent magnitude of about 26.7 . What is the apparent magnitude of the Sun as seen from Saturn, about 10 AU away? (Remember that one AU is the distance from Earth to the Sun and that the brightness decreases as the inverse square of the distance.) Would the Sun still be the brightest star in the sky?arrow_forward
- Is the Sun an average star? Why or why not?arrow_forwardIs there any place on Earth where all the visible stars are circumpolar? If so, where? Is there any place on Earth where none of the visible stars is circumpolar? If so, where? Explain your answers.arrow_forwardSuppose that two stars in a binary star system are separated by a distance of 80 million kilometers and are located at a distance of 160 light years from earth. What is the angular separation of the two stars? Give your answer in arcsecondsarrow_forward
- The nearest star to our sun is Proxima Centauri, at a distance of 4.3 light-years from the Sun. A light-year is the distance that light travels in one year (365 days). How far away, in kilometers, is Proxima Centauri from the Sun?Express your answer using two significant figures.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_forwardWhich 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.arrow_forward
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