Just the planets 4

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St. Petersburg College *

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1000C

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Astronomy

Date

Apr 3, 2024

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docx

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4

Uploaded by BrigadierMonkey5865

The Planets Name ___Bernisha____________________________________ Planet AU from the Sun Period of revolution Period of rotation Diameter (mi) Mass relative to Earth Density Number of moons Mercury 0.4 88 D 59 D 3015.06 0.056 5.4 0 Venus 0.7 224.7 D 244 D* 7526.18 0.82 5.2 0 Earth 1 365.25 D 1 D 7919.88 1 5.5 1 Mars 1.5 687 D 1.02 D 4216 0.108 3.9 2 Jupiter 5 11.86 Y 0.4097 D 88700.3 317.87 1.3 79 Saturn 10 29.46 Y 0.426 D 75000.16 95.14 0.7 82 Uranus 20 84 Y 0.718 D 28999.88 15.56 1.2 27 Neptune 30 165 Y 0.669 D 28900.06 17.21 1.7 14 D is Earth days Y is Earth years *Retrograde – Venus is spinning clockwise not counterclockwise. Density is mass per unit of volume water has a density of exactly 1, ie one gram per cubic centimeter. Look at the densities of the Jovian versus the terrestrial planets. 1) What is the average density of the Jovian planets? Density 3.626 2) What is the average density of the terrestrial planets? Density 17.075 3) Why are they so different? Jovian plants outer gas in the solar system Terrestrial planets inner , made of rocks Remember that period of rotation is how long it takes a planet to spin. It can also be thought of as how long a day is. The unit “D” for period of rotation is Earth Days. 4) How long is a day on Mercury? 59 days 5) How long is a day on Neptune?
66 days 6) Does distance from the Sun have anything to do with the period of rotation? No connection between the two. 7) Do Jovian planets have longer or shorter days than terrestrial planets? Yes, there longer than terrestrial planets 8) So, are they spinning faster or slower than terrestrial planets? Jovian spin much faster than Terrestrial Revolution is how long it takes a planet to go around the sun. This is a year on that planet. 9) How long is a year on Mercury? 88 days 10)How long is a year on Neptune? 165 earth days 11)Is the period of revolution related to distance from the sun? If so How? The squares of the period are proportional to the cubes. The more distance the planet the longer it takes to revolution. Remember that Kepler’s third law relates how far a planet is from the sun to its orbital period. P 2 =D 3 where P is the period and D is the distance to the sun in AUs. So if a planet is 2 AUs from the sun; P 2 = D 3 P 2 = 2 3 P 2 = 8 P = 8 P= 2.8 Earth Years So it takes the planet 2.8 Earth years to go around the Sun 12)What is the orbital period of a planet that sits 3 AUs from the sun? 3x3x3x3= 27
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