Fomalhaut
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Fomalhaut (UK: , US: ) is the brightest star in the southern constellation of Piscis Austrinus, the Southern Fish, and one of the brightest stars in the night sky. It has the Bayer designation Alpha Piscis Austrini , which is Latinized from α Piscis Austrini , and is abbreviated Alpha PsA or α PsA. This is a class A star on the main sequence approximately 25 light- years (7.7 pc) from the Sun as measured by the Hipparcos astrometry satellite. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.
It is classified as a Vega-like star that emits excess infrared radiation, indicating it is surrounded by a circumstellar disk. Fomalhaut, K-type main- sequence star TW Piscis Austrini, and M-type, red dwarf star LP 876-10 constitute a triple system, even though the companions are separated by approximately 8 degrees.
Fomalhaut was the first stellar system with an extrasolar planet candidate imaged at visible wavelengths, designated Fomalhaut b. However, 2019 and 2023 analyses of existing and new observations indicate that Fomalhaut b isn't a planet, rather an expanding blob of debris from a massive planetesimal collision.
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- Slug: fomalhaut
- Added: Jul 20, 2024