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16 relations: Absolute magnitude, Air mass (astronomy), Andrea Milani (mathematician), Elongation (astronomy), Fabrizio Bernardi, Fortran, Galactic coordinate system, Horizontal coordinate system, Minimum orbit intersection distance, Near-Earth object, Orbit, Phase angle (astronomy), PHP, Planet, Solar System, 99942 Apophis.
Absolute magnitude
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
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Air mass (astronomy)
In astronomy, air mass (airmass, or AM) is the path length for light from a celestial source to pass through the atmosphere.
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Andrea Milani (mathematician)
Andrea Milani Comparetti (born 1948) is an Italian mathematician and astronomer based at Pisa University interested in topics as celestial mechanics, asteroids, Near Earth Objects (NEO), and the BepiColombo mission.
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Elongation (astronomy)
In astronomy, a planet's elongation is the angular separation between the Sun and the planet, with Earth as the reference point.
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Fabrizio Bernardi
Fabrizio Bernardi (born 1972) is an Italian astronomer and discoverer of minor planets and comets, best known for the co-discovery of the near-Earth and potentially hazardous asteroid 99942 Apophis.
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Fortran
Fortran (formerly FORTRAN, derived from Formula Translation) is a general-purpose, compiled imperative programming language that is especially suited to numeric computation and scientific computing.
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Galactic coordinate system
The galactic coordinate system is a celestial coordinate system in spherical coordinates, with the Sun as its center, the primary direction aligned with the approximate center of the Milky Way galaxy, and the fundamental plane parallel to an approximation of the galactic plane but offset to its north.
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Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane.
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Minimum orbit intersection distance
Minimum orbit intersection distance (MOID) is a measure used in astronomy to assess potential close approaches and collision risks between astronomical objects.
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Near-Earth object
A near-Earth object (NEO) is any small Solar System body whose orbit can bring it into proximity with Earth.
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Orbit
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
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Phase angle (astronomy)
Phase angle in astronomical observations is the angle between the light incident onto an observed object and the light reflected from the object.
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PHP
PHP: Hypertext Preprocessor (or simply PHP) is a server-side scripting language designed for Web development, but also used as a general-purpose programming language.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Solar System
The Solar SystemCapitalization of the name varies.
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99942 Apophis
99942 Apophis (previously known by its provisional designation) is a near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a probability of up to 2.7% that it would hit Earth on April 13, 2029.
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