October 19, NOTES Solar System Data Table.notebook. Which page in the ESRT???? million km million. average.

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1 Celestial Object: Naturally occurring object that exists in space. NOT spacecraft or man-made satellites Which page in the ESRT???? Mean = average Units = million km How can we find this using the Solar System Data Table in the ESRT? million Oct 20 8:46 AM 1

2 1 AU = million km Example: Mercury = 57.9 million km (57.9 x 10 6 km) 1 AU = million km Example: Mercury = 57.9 million km (57.9 x 10 6 km) 57.9 x 10 6 km x 1 AU = million million x 10 6 km x 1 AU = 57.9 x 10 6 km x 1 AU = 57.9 AU million 10 6 Venus = x 10 6 km 57.9 x 10 6 km x 1 AU = 0.4 AU 2

3 Venus = Venus = x 10 6 km x 1 AU = x 10 6 km x 1 AU = Venus = x 10 6 km x 1 AU = AU = 0.7 AU : Mercury = 0.4 AU Venus = 0.7 AU Mars = 1.5 AU Jupiter = 5.2 AU Saturn = 9.5 AU Uranus = 19.2 AU Neptune = 30.1 AU Most astronomical events are cyclic and predictable. Period = one complete (Review) Revolution = around the Most astronomical events are cyclic and predictable. Period = one complete cycle (Review) Revolution = orbit around the Sun (one cycle) 3

4 d = days ( Earth days ) / y = years ( Earth years ) Earth = days (reason we have years) [ We gain one day every years ] Oct 20 8:54 AM d = days ( Earth days ) / y = years ( Earth years ) Earth = days (reason we have leap years) [ We gain one day every 4 years ] Oct 20 8:54 AM Direct relationship to distance from the Sun: Orbital speed versus Distance from the Sun: Period of Revolution Orbital Speed Distance from Sun Positive slope Negative Distance from Sun inverse slope indicates an relationship 4

5 Period of Rotation at the Equator: (Review) Rotation = Spinning around its own. axis Interesting fact about Venus: Period of Revolution = Period of Rotation = Therefore, its is longer that its Oct 20 8:58 AM Period of Rotation at the Equator: (Review) Rotation = Spinning around its own. axis Interesting fact about Venus: days Period of Revolution = Period of Rotation = Therefore, its is longer that its Oct 20 8:58 AM Period of Rotation at the Equator: (Review) Rotation = Spinning around its own. axis Interesting fact about Venus: days Period of Revolution = 243 days Period of Rotation = Therefore, its is longer that its Period of Rotation at the Equator: (Review) Rotation = Spinning around its own. axis Interesting fact about Venus: Period of Revolution = Period of Rotation = day days 243 days year Therefore, its is longer that its 5

6 NOTES Solar System Data Table.notebook Eccentricity of Orbit Background concerning Planetary (and Satellite) Motion: 2. Law of Equal Areas Kepler's three laws of planetary motion: The speed at which any planet moves through space is constantly changing. 1. Law of Ellipses: Planets orbit the sun in a path described as an ellipse. faster A planet moves closest to the sun, and furthest from the sun. slower NOT a perfect circle, nor An elliptical path is oval a line it is an shape straight somewhere in between. If an imaginary line were drawn from the center of the planet to the center of the sun, that line would sweep same out the area in equal periods of time: Jul 9 12:17 PM Jul 9 12:43 PM elliptical an orbit is. Eccentricity is a measure of how elliptical an orbit is. Eccentricity is a measure of how elliptical shape it is. elliptical shape it is. The formula for eccentricity is: elliptical an orbit is. Eccentricity is a measure of how elliptical an orbit is. Eccentricity is a measure of how elliptical shape it is. elliptical shape it is. The formula for eccentricity is: The formula for eccentricity is: 6

7 elliptical Eccentricity is a measure of how an orbit is. elliptical shape it is. The formula for eccentricity is: 0 1 Eccentricity will range in value between and. The closer to means the more the shape. The closer to means the the shape. Eccentricity is a value circular Eccentricity will range in value between and. The closer to means the more the shape. The closer to means the the shape. Eccentricity is a value. Eccentricity will range in value between and. 0 1 The closer to means the more the shape. The closer to means the more enlongated the shape. Eccentricity is a value. 0 1 circular Eccentricity will range in value between and. 0 1 The closer to means the more the shape. The closer to means the more enlongated the shape. unitless Eccentricity is a value. 0 1 circular 7

8 Equatorial Diameter (km) NOT the circumference Note: 1 km = 0.62 miles Oct 19 8:06 AM Mass (Earth = 1.00) Earth used as the base amount Unique to ESRT Normally, the Sun is used as the base Mass (Earth = 1.00) Which class of planets have the most mass? Jovian amount and that is referred to as Solar Mass Density = mass volume Mass has a direct relationship with density Volume has an inverse relationship with density Oct 19 8:14 AM 8

9 Which class of planets are more dense? Terrestrial Oct 19 8:16 AM Given that the volume of a sphere = 4/3 π r 3 A planet s volume is effected by its radius Jovian: As radius increases. volume increases and density decreases Terrestrial: As radius decreases. volume decreases and density increases Oct 21 9:41 AM 9

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