Astronomy and Orbital Mechanics

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A German astronomer and mathematician known for his laws of planetary motion.

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Who was Johannes Kepler?

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1. The Law of Ellipses: The orbit of a planet is an ellipse with the Sun at one focus. 2. The Law of Equal Areas: A line segment joining a planet and the sun sweeps out equal areas during equal intervals of time. 3. The Law of Harmonies: The square of the orbital period (P) of a planet is proportional to the cube of the semi-major axis (a) of its orbit (P² ∝ a³).

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What are the three laws of planetary motion described by Kepler?

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An orbit that is relatively close to Earth’s surface, with altitudes ranging from 180 km to 2000 km, useful for satellite imaging and communication.

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What is Low Earth Orbit (LEO)?

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An orbit where satellites fly above Earth’s equator, moving from west to east, matching Earth’s rotation, at an altitude of 35,786 km.

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What is a Geostationary Orbit (GEO)?

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A type of low Earth orbit at altitudes of 200 to 1000 km, where satellites travel from pole to pole, useful for global Earth coverage.

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What is a Polar Orbit?

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A polar orbit where satellites are in sync with the Sun, passing over the same spot on Earth at the same local time every day.

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What is a Sun-synchronous orbit (SSO)?

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An orbit that covers a wide range of altitudes between LEO and GEO, commonly used by navigation satellites.

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What is Medium Earth Orbit (MEO)?

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Special orbits used to transition from one orbit to another, often involving initial transfer orbits for satellites.

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What are Transfer Orbits?

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An orbit where a spacecraft's distance from Earth varies greatly, useful for observing Earth or space from high altitudes.

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What is a Highly Eccentric Orbit (HEO)?

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Having highly eccentric orbits around the Sun, often taking millions of years to complete an orbit.

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What are Comets known for?