Its recommended three-letter abbreviation, as adopted by the International Astronomical Union in 1922, is "PsA".
The official constellation boundaries, as set by Belgian astronomer Eugène Delporte in 1930, are defined by a polygon of four segments (illustrated in infobox).
Surrounded by a circumstellar disk, it was announced as having a planet in 2008, though this discovery has been challenged.
NGC 7259 is another spiral galaxy, which hosted a supernova—SN 2009ip—in 2009. At redshift z = 0.116, the BL Lacertae object PKS 2155-304 is one of the brightest blazars in the sky. ==Notes== ==References== ==External links== Warburg Institute Iconographic Database (over 150 medieval and early modern images of Piscis Austrinus - Piscis magnus) The clickable Piscis Austrinus Constellations Southern constellations Constellations listed by Ptolemy
Two gas giant planets with masses around 56% and 73% that of Jupiter were discovered in 2012 via the radial velocity method.
Lacaille 9352 is the brightest red dwarf star in the night sky; two super-earths were discovered to be orbiting it in 2020.
In June 2020 two super-Earth planets were discovered via radial velocity method. Exoplanets have been discovered in five other star systems in the constellation.
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