26 relations: Alinda asteroid, Amor asteroid, Apollo asteroid, Asteroid, Astronomical unit, Atira asteroid, Earth, Eleanor F. Helin, Impact event, Inferior and superior planets, List of Earth-crossing minor planets, List of minor-planet groups, Mars, Mercury (planet), Minor Planet Center, Near-Earth object, Orbital eccentricity, Palomar Observatory, Perihelion and aphelion, Potentially hazardous object, Provisional designation in astronomy, Sampling bias, Semi-major and semi-minor axes, Solar System, Sun, Venus.
The Alinda asteroids are a dynamical group of asteroids with a semi-major axis of about 2.5 AU and an orbital eccentricity approximately between 0.4 and 0.65.
The Amor asteroids are a group of near-Earth asteroids named after the asteroid 1221 Amor.
The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, discovered by German astronomer Karl Reinmuth in the 1930s.
Asteroids are minor planets, especially those of the inner Solar System.
The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.
Atira asteroids or Apohele asteroids, also known as Interior-Earth Objects (IEOs), are asteroids, whose orbits are entirely confined within Earth's orbit, that is, their orbit has an aphelion (farthest point from the Sun) smaller than Earth's perihelion (nearest point to the Sun), which is 0.983 astronomical units (AU).
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
Eleanor Francis "Glo" Helin (née Francis, 19 November 1932 – 25 January 2009) was an American astronomer.
An impact event is a collision between astronomical objects causing measurable effects.
In the Solar System, a planet is said to be inferior with respect to another planet if its orbit lies inside the other planet's orbit around the Sun.
An Earth-crosser is a near-Earth asteroid whose orbit crosses that of Earth as observed from the ecliptic pole of Earth's orbit.
A minor-planet group is a population of minor planets that share broadly similar orbits.
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury.
Mercury is the smallest and innermost planet in the Solar System.
The Minor Planet Center (MPC) is the official worldwide organization in charge of collecting observational data for minor planets (such as asteroids and comets), calculating their orbits and publishing this information via the Minor Planet Circulars.
A near-Earth object (NEO) is any small Solar System body whose orbit can bring it into proximity with Earth.
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.
Palomar Observatory is an astronomical observatory located in San Diego County, California, United States, southeast of Los Angeles, California, in the Palomar Mountain Range.
The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.
A potentially hazardous object (PHO) is a near-Earth object – either an asteroid or a comet – with an orbit that can make exceptionally close approaches to the Earth and large enough to cause significant regional damage in the event of impact.
Provisional designation in astronomy is the naming convention applied to astronomical objects immediately following their discovery.
In statistics, sampling bias is a bias in which a sample is collected in such a way that some members of the intended population are less likely to be included than others.
In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.
The Solar SystemCapitalization of the name varies.
The Sun is the star at the center of the Solar System.
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.