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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
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Kepler's Third Law of Planetary Motion

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The Moon orbits around the Earth. In turn, the Earth (and other planets) orbit the Sun. The space directly above our atmosphere is filled with artificial satellites in orbit. One can examine the circular orbit, the simplest kind of orbit, to understand the relationship between the speed and the period of planets and satellites with respect to their positions and the bodies that they orbit.
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Kepler-47: un sistema multiplanetario circumbinario de tránsito en tránsito.

Jerome A Orosz1, William F Welsh, Joshua A Carter

  • 1Astronomy Department, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA. orosz@sciences.sdsu.edu

Science (New York, N.Y.)
|August 31, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Los astrónomos descubrieron Kepler-47, un sistema planetario único con dos planetas orbitando una estrella binaria. Este hallazgo demuestra que los planetas pueden formarse y existir en sistemas con estrellas binarias eclipsantes.

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Área de la Ciencia:

  • La ciencia exoplanetaria es la ciencia de los exoplanetas.
  • La astronomía es la astronomía.
  • La astrofísica es la astrofísica.

Sus antecedentes:

  • Los sistemas estelares binarios son comunes en la galaxia.
  • La formación y la estabilidad de los sistemas planetarios alrededor de estrellas binarias presentan desafíos únicos.
  • Las detecciones anteriores de planetas en sistemas binarios han sido limitadas.

Objetivo del estudio:

  • Para informar sobre la detección y caracterización de un sistema de dos planetas, Kepler-47, que orbita alrededor de una estrella binaria eclipsante.
  • Investigar el potencial para la formación planetaria y la habitabilidad en entornos de estrellas binarias.
  • Para establecer que las estrellas binarias cercanas pueden albergar sistemas planetarios completos.

Principales métodos:

  • Fotometría de tránsito utilizando el Telescopio Espacial Kepler para detectar tránsitos planetarios.
  • Análisis de curvas de luz para determinar períodos orbitales, radios y propiedades estelares.
  • Mediciones de velocidad radial (implicadas) para la determinación de la masa y la confirmación de la órbita.

Principales resultados:

  • Detección de Kepler-47, un sistema con dos planetas (Kepler-47b y Kepler-47c) en órbita alrededor de una estrella binaria eclipsante.
  • El planeta interior (Kepler-47b) tiene un radio de 3,0 veces el de la Tierra y orbita cada 49,5 días.
  • El planeta exterior (Kepler-47c) tiene un radio 4,6 veces el de la Tierra, orbita cada 303,2 días y reside en la zona habitable.

Conclusiones:

  • Kepler-47 es el primer sistema validado con múltiples planetas orbitando una estrella binaria eclipsante.
  • La existencia de Kepler-47 demuestra que sistemas planetarios completos pueden formarse alrededor de estrellas binarias cercanas.
  • La posición del planeta exterior en la zona habitable plantea preguntas sobre la habitabilidad potencial en tales sistemas.