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Eta Geminorum

Eta Geminorum (η Gem, η Geminorum) is a triple star system in the constellation Gemini. [1]

35 relations: Aitken Double Star Catalogue, Apparent magnitude, Bright Star Catalogue, Catalog of Components of Double and Multiple Stars, Chinese constellations, Constellation, Crater-class cargo ship, Durchmusterung, Ecliptic, Epoch (astronomy), Gamma Geminorum, Gemini (constellation), General Catalogue of Variable Stars, Henry Draper Catalogue, Hipparcos, International Celestial Reference System, Light-year, Mercury (planet), Moon, Mu Geminorum, Nu Geminorum, Occultation, Pinyin, Planet, Red giant, Semiregular variable star, Smithsonian Astrophysical Observatory Star Catalog, Star system, Stellar classification, Sun, United States Navy, USS Propus (AK-132), Variable star, Venus, Xi Geminorum.

Aitken Double Star Catalogue

The Aitken Double Star Catalogue, or ADS, is a star catalogue of double stars.

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Apparent magnitude

The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

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Bright Star Catalogue

The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.

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Catalog of Components of Double and Multiple Stars

The Catalog of Components of Double and Multiple Stars, or CCDM, is an astrometric star catalogue of double and multiple stars.

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Chinese constellations

Traditional Chinese astronomy has a system of dividing the celestial sphere into asterisms or constellations, known as "officials" (Chinese xīng guān).

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Constellation

In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).

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Crater-class cargo ship

Crater-class cargo ship is a category of freighter that was constructed for use by the United States Navy during World War II under Maritime Commission EC2-S-C1 type.

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Durchmusterung

In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.

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Ecliptic

The ecliptic is the apparent path of the Sun on the celestial sphere, and is the basis for the ecliptic coordinate system.

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Epoch (astronomy)

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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Gamma Geminorum

Gamma Geminorum (γ Gem, γ Geminorum) is the third brightest star in the constellation Gemini.

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Gemini (constellation)

Gemini is one of the constellations of the zodiac.

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General Catalogue of Variable Stars

The General Catalogue of Variable Stars (GCVS) is a list of variable stars.

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Henry Draper Catalogue

The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.

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Hipparcos

Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.

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International Celestial Reference System

The International Celestial Reference System (ICRS) is the current standard celestial reference system adopted by the International Astronomical Union (IAU).

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Light-year

A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.

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Mercury (planet)

Mercury is the smallest and closest to the Sun of the eight planets in the Solar System, with an orbital period of about 88 Earth days.

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Moon

The Moon (in Greek: Selene, in Latin: Luna) is Earth's only natural satellite.

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Mu Geminorum

Mu Geminorum (μ Gem, μ Geminorum) is the Bayer designation for a star in the northern constellation of Gemini.

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Nu Geminorum

Nu Geminorum (ν Gem) is a star in the constellation Gemini.

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Occultation

An occultation is an event that occurs when one object is hidden by another object that passes between it and the observer.

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Pinyin

Pinyin, or Hanyu Pinyin, is the official phonetic system for transcribing the Mandarin pronunciations of Chinese characters into the Latin alphabet in China, Taiwan, and Singapore. It is often used to teach Standard Chinese and a pinyin without diacritic markers is often used in foreign publications to spell Chinese names familiar to non-Chinese and may be used as an input method to enter Chinese characters into computers. The Hanyu Pinyin system was developed in the 1950s based on earlier forms of romanization. It was published by the Chinese government in 1958 and revised several times. The International Organization for Standardization (ISO) adopted pinyin as an international standard in 1982. The system was adopted as the official standard in Taiwan in 2009, where it is used for romanization alone rather than for educational and computer input purposes. The word Hànyǔ means the spoken language of the Han people and pīnyīn literally means "spelled-out sounds".

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Planet

A planet is an astronomical object orbiting a star, brown dwarf, or stellar remnant that.

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Red giant

A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.

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Semiregular variable star

Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities.

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Smithsonian Astrophysical Observatory Star Catalog

The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.

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Star system

A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.

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Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

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Sun

The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth.

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United States Navy

The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States.

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USS Propus (AK-132)

USS Propus (AK-132) was a commissioned by the U.S. Navy for service in World War II.

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Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

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Venus

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.

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Xi Geminorum

Xi Geminorum (ξ Gem) is a star in the zodiac constellation Gemini with the traditional name Alzirr.

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Redirects here:

7 Gem, 7 Geminorum, Eta Gem, Praepes, Propus, Tejat Prior.

References

[1] https://en.wikipedia.org/wiki/Eta_Geminorum

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