Horologium (constellation)
Horologium is a constellation of six stars faintly visible in the southern celestial hemisphere. It was first described by the French astronomer Nicolas-Louis de Lacaille in 1756. In 1922 the constellation was redefined by the International Astronomical Union and has since been an IAU designated constellation.
About Horologium (constellation) in brief
Horologium is a constellation of six stars faintly visible in the southern celestial hemisphere. It was first described by the French astronomer Nicolas-Louis de Lacaille in 1756 and visualized by him as a clock with a pendulum and a second hand. In 1922 the constellation was redefined by the International Astronomical Union and has since been an IAU designated constellation. Horologium’s associated region is wholly visible to observers south of 23°N. The constellation’s brightest star is Alpha Horologii, an ageing orange giant star that has swollen to around 11 times the diameter of the Sun. Four star systems in the constellation are known to have exoplanets; at least one—Gliese 1061—contains an exoplanet in its habitable zone. Covering a total of 248. 9 square degrees or 0.
603% of the sky, it ranks 58th in area out of the 88 modern constellations. The official constellation boundaries are defined by a twenty-two-sided polygon. In the equatorial coordinate system, the right ascension coordinates of these borders lie between 02h 12. 8m and 04h 20. 3m, while the declination coordinates are between −39. 64° and −67. 04°. At magnitude 3.9, AlphaHorologii is the brightest star in the. constellation, located 115 light-years from Earth. The three letter abbreviation for the constellation, as adopted by the IAU in 1922, is “Hor”. HorologIUM has one star brighter than apparent magnitude 4, and 41 stars brighter than or equal to magnitude 6. 5. It is bordered by five constellation: Eridanus, Caelum, Reticulum, Dorado, and Hydrus.
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This page is based on the article Horologium (constellation) published in Wikipedia (as of Nov. 05, 2020) and was automatically summarized using artificial intelligence.
