What is the amount of time it takes for a complete cycle of Miranda? About 12 ho
ID: 233202 • Letter: W
Question
What is the amount of time it takes for a complete cycle of Miranda?
About 12 hours
About 26 hours
About 34 hours
About 46 hours
1 points
QUESTION 23
What is the amount of time it takes for a complete cycle of Portia?
About 12 hours
About 26 hours
About 34 hours
About 46 hours
1 points
QUESTION 24
What is the maximum angular separation of Miranda from Uranus?
2.6’’
4.4’’
8.5’’
17.0’’
1 points
QUESTION 25
What is the maximum angular separation of Portia from Uranus?
2.2”
4.3”
10.1”
17.0”
1 points
QUESTION 26
Lab 11 Figure 5 - Click Image to Enlarge
Planet Tilted on Its Side
You should notice that, unlike the other planets, the satellite orbits for Uranus do not align with our ecliptic (depending on the time of year). To see this, hide the graph from the top of the screen by dragging its lower border up until the graph disappears. From the View menu, select Ecliptic Guides/The Ecliptic and click the Ec (Ecliptic Coordinate system) button on the button bar. The horizontal grid lines are now aligned with the Earth's orbit around the Sun. Although many of the planets are slightly tilted with respect to the ecliptic, Uranus's tilt is extreme. The planet and its corresponding satellite orbits are tilted almost completely on their sides. This tilt results in a unique observational effect: At certain times during Uranus's year, at certain positions in its orbit, the satellite orbits form a bull's-eye as seen from Earth.
To observe this phenomenon, lock on Uranus by double-clicking Uranus in the Find tab. Enable both checkboxes for all the moons. Zoom in and out so that you can see all the satellite orbits. First note that the outer moons have more eccentric orbits and do not align with Uranus's rotational plane. The inner moons, however, align nicely with the rotational plane. Zoom in so that you can best view the inner moons that are aligned. On the control panel, select a Time Flow Rate of 1 year and click the Play button. You should see an animation of the moons orbiting Uranus while Uranus changes its perspective relative to us on Earth. Note that, at certain times of the year, you see a bull's-eye pattern.
The animation might seem a bit bouncy. Each "bounce" is approximately one Earth year, bringing us a little closer and then taking us away again from Uranus. Uranus is 20 au away, and Earth's orbit changes the distance by 2 au every six months. It's only a 10% difference, but it's enough to cause the "bounces."
After you have had a chance to explore, use the Starry Night software to answer these questions.
Approximately when will Uranus form next form a bull’s eye?
2020
2030
2040
2050
1 points
QUESTION 27
Approximately when will Uranus next be viewed from the edge?
2020
2030
2040
2050
1 points
QUESTION 28
Following the date in question 27, approximately when will Uranus next form a bull’s eye?
2060
2070
2080
2090
1 points
QUESTION 29
Lab 11 Figure 6 - Click Image to Enlarge
Uranus's Orbital Characteristics
We will use the Starry Night software to observe the characteristics of Uranus's orbit. Turn off Ecliptic Guides by clicking the Ec button again; turn off labels by clicking the Labels button. Deselect the checkboxes for any moons on the Findtab. Return to using the Adaptive cursor by selecting it from the drop-down cursor tool menu.
Use the Zoom control at the far right of the control panel to zoom back out to full-scale view. Right-click (Control-click for Mac) Uranus and select Orbit. This action shows Uranus's orbital path as seen from Earth. Notice that you can see only a portion of Uranus's orbit because part of it is blocked by the horizon. Click the Horizon button on the button bar to hide Earth's horizon for a complete view of Uranus's orbit. Also click the Daylight button to turn off daylight. You should still be locked on to Uranus. If not, right-click (Control-click for Mac) the planet Uranus and select Centre. To maintain the proper perspective, select Ecliptic Guides from the View menu and then select The Ecliptic.
Enter January 1, 2014 in the Time and Date field and click the Sunset button. Note the constellation that Uranus is in on this date. Select 1 days from the Time Flow Rate drop-down list and click the Play time mode button. If you need to slow down or speed up, adjust the Time Flow Rate field as needed.
You should see Uranus locked in the center of your field of view as it moves across the starry background. It should complete a full revolution in less than a minute.
After you have had a chance to explore, use the Starry Night software to answer these questions.
In what constellation is Uranus on January 1, 2014?
Taurus
Libra
Pisces
Aries
1 points
QUESTION 30
After Uranus leaves the constellation it occupies on January 1, 2014, in which of the following years does it return to that same constellation?
2056
2078
2084
2094
1 points
QUESTION 31
Lab 11 Figure 7 - Click Image to Enlarge
Flying to Uranus
In this final section of the lab, we will explore from Uranus's surface. Let's see what a day (technically referred to as asolar day) would be like on Uranus. The easiest way to experience a solar day is by watching a sunset, taking note of the date and time, watching another consecutive sunset, and calculating the time difference between the two events. For the purposes of this exercise, make sure that the date is set to January 1, 2014, click the Sunset button, and turn off planet labels and elliptical tracks.
Right-click (Control-click for Mac) on Uranus and select Go There from the menu. Note: You can animate the journey by first deselecting the Only animate intra planet changes checkbox under File/Preferences/Responsiveness. Be sure that your horizon is turned on so that you see the photorealistic surface panorama.
View from the surface of Uranus by selecting Other from the Viewing Location drop-down menu and then selecting The Surface of, Uranus from the View From drop-down menu. Click the W viewing direction button on the button bar or press the W key on the keyboard. Next, select 3000X from the Time Flow Rate drop-down list and click the Playbutton. Observe what a day would look like as seen from the surface of Uranus (because Uranus has no solid surface, it's really the cloud tops we are viewing). Note that as a result of Uranus's retrograde rotation, the motion appears to be backward when compared to what we are used to here on Earth (and as rotation appears for most of the other planets).
To determine the revolutionary period, or a planet's "year," return to the solar system view. From the Favourites menu, select C-The Planets/Outer Planets/Outer Solar System. Select 1 Days from the Time Flow Rate drop-down list (or something slightly slower), click the Play time mode button, and note the time it takes for the planet to return to its original position (you might have to increase the number of days depending on the speed of your computer). You might find it easiest to align the planet to the furthest left or right before starting. Write down your observation (you will need it to answer the questions).
After you have had a chance to explore, use the Starry Night software to answer these questions.
Assuming a start date of January 1, 2014, in what year does Uranus complete its first full revolution?
2064
2097
2122
2141
1 points
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About 12 hours
About 26 hours
About 34 hours
About 46 hours
Explanation / Answer
The orbital period of Miranda is 1.413479 days = 1.413479 * 24 = 33.9235 hours
The nearest option is C) About 34 hours
__________________________________________________________________________
23) The orbital period of Portia is 0.51 days = 0.51 * 24 = 12.24 hours
The nearest option is A) About 12 hours
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