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Eta Herculis, the Glossary

Eta Herculis (η Her, η Herculis) is a fourth-magnitude star in the constellation Hercules.^[1]

30 relations: Apparent magnitude, Asterism (astronomy), Bayer designation, Boss General Catalogue, Bright Star Catalogue, Catalog of Components of Double and Multiple Stars, Catalogues of Fundamental Stars, Constellation, Double star, Durchmusterung, Edmond Halley, Flamsteed designation, Globular cluster, Henry Draper Catalogue, Hercules (constellation), Hipparcos, Light-year, Messier 13, Northern Hemisphere, Parsec, Satellite, Smithsonian Astrophysical Observatory Star Catalog, Solar mass, Solar radius, Star, Star system, Stellar classification, Sun, University of Illinois Urbana-Champaign, Zeta Herculis.

Apparent magnitude

Apparent magnitude is a measure of the brightness of a star or other astronomical object.

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Asterism (astronomy)

An asterism is an observed pattern or group of stars in the sky.

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Bayer designation

A Bayer designation is a stellar designation in which a specific star is identified by a Greek or Latin letter followed by the genitive form of its parent constellation's Latin name.

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Boss General Catalogue

Boss General Catalogue (GC, sometimes General Catalogue) is an astronomical catalogue containing 33,342 stars.

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The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars, Yale Bright Star Catalogue, or just YBS, 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. Eta Herculis and bright Star Catalogue are bright Star Catalogue objects.

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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. Eta Herculis and catalog of Components of Double and Multiple Stars are double stars.

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Catalogues of Fundamental Stars

The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.

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Constellation

A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object.

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Double star

In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes. Eta Herculis and double star are double stars.

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Durchmusterung

In astronomy, Durchmusterung or Bonner Durchmusterung (BD) is an astrometric star catalogue of the whole sky, published by the Bonn Observatory in Germany from 1859 to 1863, with an extension published in Bonn in 1886.

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Edmond Halley

Edmond (or Edmund) Halley (–) was an English astronomer, mathematician and physicist.

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Flamsteed designation

A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.

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Globular cluster

A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center.

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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. Eta Herculis and Henry Draper Catalogue are Henry Draper Catalogue objects.

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Hercules (constellation)

Hercules is a constellation named after Hercules, the Roman mythological hero adapted from the Greek hero Heracles.

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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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Light-year

A light-year, alternatively spelled light year (ly or lyr), is a unit of length used to express astronomical distances and is equal to exactly 9,460,730,472,580.8 km (Scientific notation: 9.4607304725808 × 1012 km), which is approximately 5.88 trillion mi.

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Messier 13

Messier 13 or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster), is a globular cluster of several hundred thousand stars in the constellation of Hercules. Eta Herculis and Messier 13 are Hercules (constellation).

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References

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

Also known as 44 Herculis, Eta Her, Η Her, Η Herculis.

Eta Herculis, the Glossary

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References