25 relations: Billion years, Centre de données astronomiques de Strasbourg, Earth radius, Epoch (astronomy), Gliese Catalogue of Nearby Stars, Gravity of Earth, Kelvin, L 97-12, Light-year, List of star systems within 25–30 light-years, Minute and second of arc, Orion (constellation), Parallax, Parsec, Solar mass, Star catalogue, Sun, Surface gravity, The Astronomical Journal, Variable star designation, WD 2359-434, White dwarf, Wolf 489, 1741 Giclas, 2MASS.
A billion years (109 years) is a unit of time on the petasecond scale, more precisely equal to seconds.
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Centre de données astronomiques de Strasbourg
The Centre de Données astronomiques de Strasbourg (CDS; English translation: Strasbourg Astronomical Data Center) is a data hub which collects and distributes astronomical information.
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Earth radius is the approximate distance from Earth's center to its surface, about.
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In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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Gliese Catalogue of Nearby Stars
The Gliese Catalogue of Nearby Stars is a modern star catalogue of stars located within 25 parsecs (81.54 ly) of the Earth.
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Gravity of Earth
The gravity of Earth, which is denoted by, refers to the acceleration that is imparted to objects due to the distribution of mass within Earth.
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The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.
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L 97-12 (or WD 0752-676, or LHS 34, or Gliese 293) is a nearby degenerate star (white dwarf), located in the constellation Volans, the single known component of the system.
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The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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List of star systems within 25–30 light-years
This is a list of star systems within 25-30 light years of Earth.
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Minute and second of arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc is a unit of angular measurement equal to of one degree.
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Orion is a prominent constellation located on the celestial equator and visible throughout the world.
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Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
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The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System.
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The solar mass is a standard unit of mass in astronomy, equal to approximately.
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A star catalogue (Commonwealth English) or star catalog (American English), is an astronomical catalogue that lists stars.
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The Sun is the star at the center of the Solar System.
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The surface gravity, g, of an astronomical or other object is the gravitational acceleration experienced at its surface.
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The Astronomical Journal
The Astronomical Journal (often abbreviated AJ in scientific papers and references) is a peer-reviewed monthly scientific journal owned by the American Astronomical Society and currently published by IOP Publishing.
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Variable star designation
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.
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WD 2359-434 (Gliese 915, LHS 1005, L 362-81) is a nearby degenerate star (white dwarf) of spectral class DAP5.8, the single known component of the system, located in the constellation Phoenix, the nearest star in this constellation.
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A white dwarf, also called a degenerate dwarf, is a stellar core remnant composed mostly of electron-degenerate matter.
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Wolf 489 (WD 1334+039, LHS 46, G 062-053, Gliese 518) is a nearby degenerate star (white dwarf) of spectral class DZ10.0), the single known component of the system, located in the constellation Virgo.
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1741 Giclas, provisional designation, is a stony Koronian asteroid from the outer region of the asteroid belt, approximately 13 kilometers in diameter.
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The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.
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GJ 1087, Gliese 1087, V1201 Orionis.