View source for Piscis Austrinus

{{Short description|Constellation in the southern celestial hemisphere}}
{{Infobox constellation
| name = Piscis Austrinus
| abbreviation = PsA
| genitive = Piscis Austrini
| pronounce = {{IPAc-en|ˈ|p|aɪ|s|ᵻ|s|_|ɒ|s|ˈ|t|r|aɪ|n|ə|s}} or {{IPAc-en|ɒ|s|ˈ|t|r|eɪ|l|ᵻ|s}}, genitive {{IPAc-en|ˈ|p|aɪ|s|ᵻ|s|_|ɒ|ˈ|s|t|r|aɪ|n|aɪ}}
| symbolism = the [[South]]ern [[Fish]]
| RA = {{RA|21|27|13.8661}}–{{RA|23|06|54.6033}}<ref name=constellations>{{cite web |url=https://www.iau.org/public/themes/constellations/ |title=The Constellations |publisher=[[International Astronomical Union]] }}</ref>
| dec = {{dec|-24.8250446}}–{{dec|-36.4592972}}<ref name=constellations/>
| family = [[Heavenly Waters (astronomy)|Heavenly Waters]]
| quadrant = SQ4
| areatotal = 245
| arearank = 60th
| numbermainstars = 7
| numberbfstars = 21
| numberbrightstars = 1
| numbernearbystars = 3
| brighteststarname = [[Fomalhaut]] (α PsA)
| starmagnitude = 1.16
| neareststarname = [[Lacaille 9352]]
| stardistancely = 10.74
| stardistancepc = 3.29
| numbermessierobjects = 0
| meteorshowers = ?
| bordering = [[Capricornus]]<br/>[[Microscopium]]<br/>[[Grus (constellation)|Grus]]<br/>[[Sculptor (constellation)|Sculptor]]<br/>[[Aquarius (constellation)|Aquarius]]
| latmax = [[55th parallel north|55]]
| latmin = [[South Pole|90]]
| month = October
| notes=
}}

'''Piscis Austrinus''' is a [[constellation]] in the [[southern celestial hemisphere]]. The name is [[Latin]] for "the southern fish", in contrast with the larger constellation [[Pisces (constellation)|Pisces]], which represents a pair of fish. Before the 20th century, it was also known as '''Piscis Notius'''. Piscis Austrinus was one of the 48 constellations listed by the 2nd-century astronomer [[Ptolemy]], and it remains one of the 88 modern constellations. The stars of the modern constellation [[Grus (constellation)|Grus]] once formed the "tail" of Piscis Austrinus. In 1597 (or 1598), [[Petrus Plancius]] carved out a separate constellation and named it after the crane.

It is a faint constellation, containing only one [[star]] brighter than 4th [[magnitude (astronomy)|magnitude]]: [[Fomalhaut]], which is 1st magnitude and the [[List of brightest stars|18th-brightest star]] in the [[night sky]]. Fomalhaut is surrounded by a [[circumstellar disk]], and possibly hosts a planet. Other objects contained within the boundaries of the constellation include [[Lacaille 9352]], one of the brightest [[red dwarf]] stars in the night sky (though still too faint to see with the naked eye); and [[PKS 2155-304]], a [[BL Lacertae object]] that is one of the optically brightest [[blazar]]s in the sky.

==Origins==
[[File:Sidney Hall - Urania's Mirror - Aquarius, Piscis Australis & Ballon Aerostatique.jpg|left|thumb|350px|Piscis Austrinus can be seen cut off at the bottom of ''[[Urania's Mirror]]''{{'}}s 1825 depiction of [[Aquarius (constellation)|Aquarius]]. Next to it is the obsolete constellation [[Ballon Aerostatique]].]]

Pisces Austrinus originated with the Babylonian constellation simply known as the Fish (MUL.KU).<ref>{{Cite web|url=https://herebedragons.weebly.com/verities-4-meta-genetics.html|title=Verities 4: Meta-Genetics|website=Ancestral Memories|access-date=2017-12-12|archive-url=https://web.archive.org/web/20171212140757/https://herebedragons.weebly.com/verities-4-meta-genetics.html|archive-date=2017-12-12|url-status=dead}}</ref><ref>{{cite web|last1=Christoforou|first1=Peter|title=Star Constellation Facts: Piscis Austrinus|url=https://www.astronomytrek.com/star-constellation-facts-piscis-austrinus/|website=Astronomy Trek|date=24 April 2017 |access-date=5 April 2018}}</ref> Professor of astronomy [[Bradley Schaefer]] has proposed that ancient observers must have been able to see as far south as [[Mu Piscis Austrini]] to define a pattern that looked like a fish.<ref>{{cite journal | title=The latitude and epoch for the formation of the southern Greek constellations | author=Schaefer, Bradley E. |journal= Journal for the History of Astronomy| issn= 0021-8286|volume= 33, part 4|issue=113| pages= 313–50 |year=2002| bibcode=2002JHA....33..313S| doi=10.1177/002182860203300401 | s2cid=122459258 }}</ref> Like many of Schaefer's proposals this is nothing new: mu PsA is explicitly mentioned in the Almagest and the constellation is definitely a takeover from ancient Babylon.<ref>{{Cite book |last=Hoffmann |first=Susanne M. |title=Wie der Löwe an den Himmel kam: auf den Spuren der Sternbilder |last2=Elzner |first2=Kay |date=2021 |publisher=Kosmos |isbn=978-3-440-17251-3 |series=Mit Kosmos mehr entdecken |location=Stuttgart}}</ref> Along with the eagle [[Aquila (constellation)|Aquila]] the crow Corvus and water snake Hydra, Piscis Austrinus was introduced to the Ancient Greeks around 500 BCE; the constellations marked the [[summer solstice|summer]] and [[winter solstice]]s, respectively.<ref>{{cite book|last=Frank|first=Roslyn M.|title=Handbook of Archaeoastronomy and Ethnoastronomy|publisher=[[Springer Publishing|Springer]]|location=New York City|date=2015|pages=147–163|chapter=10: Origins of the "Western" Constellations|bibcode=2015hae..book.....R|chapter-url=https://www.academia.edu/15305615}}</ref>

In [[Greek mythology]], this constellation is known as the Great Fish and it is portrayed as swallowing the water being poured out by Aquarius, the water-bearer constellation. The two fish of the constellation Pisces are said to be the offspring of the Great Fish. In [[Egyptian mythology]], this fish saved the life of the Egyptian goddess [[Isis]], so she [[Catasterismi|placed]] this fish and its descendants into the heavens as constellations of stars.<ref>{{cite book |author=Eratosthenes |author2=Hyginus, C. Julius |others=Translated by Condos, Theony |title=Star myths of the Greeks and Romans: a sourcebook containing the Constellations of Pseudo-Eratosthenes and the Poetic astronomy of Hyginus |pages=[https://archive.org/details/starmythsofgreek00theo/page/163 163–164] |publisher=Red Wheel/Weiser |date=1997 |isbn=1-890482-93-5 |author-link=Eratosthenes |url=https://archive.org/details/starmythsofgreek00theo/page/163 }}</ref> In the 5th century BC, Greek historian [[Ctesias]] wrote that the fish was said to have lived in a lake near [[Manbij|Bambyce]] in Syria and had saved [[Atargatis|Derceto]], daughter of [[Aphrodite]], and for this deed was placed in the heavens. For this reason, fish were sacred and not eaten by many Syrians.<ref name=condos97>{{cite book |last1=Condos |first1=Theony |title=Star Myths of the Greeks and Romans: A Sourcebook |date=1997 |publisher=Phanes Press | location=Grand Rapids, Michigan |isbn=9781609256784 |pages=163–65 |url=https://books.google.com/books?id=9wPINXB4EAoC&pg=PA163}}</ref>

==Characteristics==
Piscis Austrinus is a constellation bordered by [[Capricornus]] to the northwest, [[Microscopium]] to the southwest, Grus to the south, [[Sculptor (constellation)|Sculptor]] to the east, and Aquarius to the north. Its recommended three-letter abbreviation, as adopted by the [[International Astronomical Union]] in 1922, is "PsA".<ref name=pa30_469>{{cite journal | last=Russell | first=Henry Norris |author-link=Henry Norris Russell | title=The new international symbols for the constellations | journal=Popular Astronomy | volume=30 | page=469 | bibcode=1922PA.....30..469R | date=1922 }}</ref> [[Ptolemy]] called the constellation ''Ichthus Notios'' "Southern Fish" in his ''[[Almagest]]''; this was Latinised to Piscis Notius and used by German celestial cartographers [[Johann Bayer]] and [[Johann Elert Bode]].<ref name=ridpathPsA>{{cite web| url=http://www.ianridpath.com/startales/piscisaustrinus.html | title=Piscis Austrinus - The Southern Fish |last1=Ridpath|first1=Ian|publisher=self-published |work=Star Tales | access-date= 23 March 2019}}</ref> Bayer also called it Piscis Meridianus and Piscis Austrinus, while French astronomer [[Nicolas-Louis de Lacaille]] called it Piscis Australis. English [[Astronomer Royal]] [[John Flamsteed]] went with Piscis Austrinus, which was followed by most subsequently.<ref name=wagman/> The official constellation boundaries, as set by Belgian astronomer [[Eugène Delporte]] in 1930, are defined by a polygon of four segments (''illustrated in infobox''). In the [[equatorial coordinate system]], the [[right ascension]] coordinates of these borders lie between {{RA|21|27.3}} and {{RA|23|06.5}}, while the [[declination]] coordinates are between −24.83° and −36.46°.<ref name=boundary>{{Cite journal | title=Piscis Austrinus, constellation boundary | journal=The Constellations | publisher=International Astronomical Union | url=https://www.iau.org/public/themes/constellations/#psa | access-date=20 August 2012}}</ref> The whole constellation is visible to observers south of latitude [[53rd parallel north|53°N]].<ref name=tirionconst>{{cite web| url=http://www.ianridpath.com/constellations2.html | title=Constellations: Lacerta–Vulpecula | work= Star Tales |author=Ian Ridpath|publisher=Self-published | access-date= 25 November 2018| author-link=Ian Ridpath }}</ref>{{efn|1=While parts of the constellation technically rise above the horizon to observers between 53°N and [[65th parallel north|65°N]], stars within a few degrees of the horizon are to all intents and purposes unobservable.<ref name=tirionconst/>}}

==Features==
[[Image:PiscisAustrinusCC.jpg|thumb|left|200px|The constellation Piscis Austrinus as it can be seen by the naked eye]]

===Stars===
{{See also|List of stars in Piscis Austrinus}}
Ancient astronomers counted twelve stars as belonging to Piscis Austrinus, though one was later incorporated into nearby Grus as [[Gamma Gruis]].<ref name=condos97/> Other stars became part of Microscopium.<ref name=ridpathPsA/> Bayer used the [[Greek letters]] [[alpha]] through [[Mu (letter)|mu]] to label the most prominent stars in the constellation. Ptolemy had catalogued Fomalhaut (Alpha Piscis Austrini) as belonging to both this constellation and Aquarius. Lacaille redrew the constellation as it was poorly visible from Europe, adding [[Pi (letter)|pi]], and relabelling [[gamma]], [[Delta (letter)|delta]] and [[epsilon]] as epsilon, [[eta]] and gamma, respectively. However, Baily and Gould did not uphold these changes as Bayer's original chart was fairly accurate. Bode added [[tau]] and [[upsilon]]. Flamsteed gave 24 stars [[Flamsteed designation]]s, though the first four numbered became part of Microscopium.<ref name=wagman>{{cite book | last = Wagman | first = Morton | date = 2003 | title = Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others | publisher = The McDonald & Woodward Publishing Company | location = Blacksburg, Virginia | isbn = 978-0-939923-78-6 |pages=251–54, 457–58}}</ref> Within the constellation's borders, there are 47 stars brighter than or equal to [[apparent magnitude]]&nbsp;6.5.{{efn|1=Objects of magnitude 6.5 are among the faintest visible to the unaided eye in suburban-rural transition night skies.<ref name=bortle>{{cite web|url=http://www.skyandtelescope.com/resources/darksky/3304011.html?page=1&c=y|title=The Bortle Dark-Sky Scale|last=Bortle|first=John E.|date=February 2001|work=[[Sky & Telescope]]|publisher=Sky Publishing Corporation|access-date=25 November 2018}}</ref>}}<ref name=tirionconst/>

Traditionally representing the mouth of the fish, Fomalhaut is the brightest star in the constellation and the [[List of brightest stars|18th-brightest star]] in the night sky, with an apparent magnitude of 1.16. Located 25.13 ± 0.09 [[light-year]]s away, it is a white [[main-sequence star]] that is 1.92 ± 0.02 times as massive and 16.63 ± 0.48 as luminous as the Sun.<ref name=age_mam>{{Cite journal | last1=Mamajek | first1=Eric E. | title=On the Age and Binarity of Fomalhaut | journal=Astrophysical Journal Letters | volume=754 | issue=2 |date=August 2012 | pages=L20 | doi=10.1088/2041-8205/754/2/L20 | arxiv=1206.6353| bibcode=2012ApJ...754L..20M | s2cid=119191190 }}</ref> Its companion [[Fomalhaut b]] was thought to be the first [[extrasolar planet]] ever detected by a visible light image, thanks to the [[Hubble Space Telescope]], but infrared observations have since retracted this claim: it is instead a spherical cloud of dust. [[TW Piscis Austrini]] can be seen close by and is possibly associated with Fomalhaut as it lies within a light-year of it. Of magnitude 6.5, it is a BY Draconis variable.<ref name=moore11>{{cite book|last=Moore|first=Patrick|title=Patrick Moore's Data Book of Astronomy|publisher=[[Cambridge University Press]]|date=2011|page=472|isbn=978-0521899352|url=https://books.google.com/books?id=2FNfjWKBZx8C&q=Piscis+Austrinus}}</ref>

The second-brightest star in the constellation,<ref name=kalerbeta/> [[Epsilon Piscis Austrini]] is a blue-white star of magnitude +4.17. Located 400 ± 20 light-years distant,<ref name=Gaia-DR2epsilon>{{cite DR2|6622561673163632768}}</ref> it is a blue-white main-sequence star 4.10 ± 0.19 times as massive as the Sun, and around 661 times as luminous.<ref name=zorec2012>{{cite journal | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | journal=Astronomy & Astrophysics | volume=537 | pages=A120 | year=2012 | last1=Zorec | first1=J. | last2=Royer | first2=F. | doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | s2cid=55586789 }}</ref>

[[Beta Piscis Austrini|Beta]], [[Delta Piscis Austrini|Delta]] and [[Zeta Piscis Austrini|Zeta]] constitute the ''Tien Kang'' ("heavenly rope") in [[China]].<ref>{{cite web| url = https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Piscis_Australis*.html| title = Richard Hinckley Allen: Star Names — Their Lore and Meaning: Piscis Australis, the Southern Fish}}</ref> Beta is a white main-sequence star of apparent magnitude 4.29 that is of similar size and luminosity to Fomalhaut but five times as remote,<ref name=kalerbeta>{{Cite web |url=http://stars.astro.illinois.edu/sow/betapsa.html |title=Beta PsA |first=Jim |last=Kaler |date=12 November 2009 |access-date=17 March 2018}}</ref> at around 143 ± 1 light-years distant from Earth.<ref name="vanLeeuwen2007">{{cite journal|first=F.|last=van Leeuwen|title=Validation of the New Hipparcos Reduction|journal=[[Astronomy and Astrophysics]]|volume=474|issue=2|pages=653–64|date=2007|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|arxiv=0708.1752|s2cid=18759600}}</ref> Delta Piscis Austrini is a double star with components of magnitude 4.2 and 9.2.<ref name=moore11/> The brighter is a yellow giant of spectral type G8 III.<ref name=houk1979>{{cite book | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | location=Ann Arbor, Michigan | publisher=Department of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}</ref> It is a [[red clump]] star that is burning helium in its core.<ref name=Liu2007>{{cite journal | last1=Liu | first1=Y. J. | last2=Zhao | first2=G. | last3=Shi | first3=J. R. | last4=Pietrzyński | first4=G. | last5=Gieren | first5=W. | title=The abundances of nearby red clump giants | journal=Monthly Notices of the Royal Astronomical Society | volume=382 | issue=2 | pages=553–66 | date=2007 | bibcode=2007MNRAS.382..553L | doi=10.1111/j.1365-2966.2007.11852.x | doi-access=free }}</ref> It is 172 ± 2 light-years distant from Earth.<ref name=Gaia-DR2delta>{{cite DR2|6603237069110536960}}</ref> Zeta Piscis Austrini is an orange giant star of spectral type K1III that is located 413 ± 2 light-years distant from Earth.<ref name=Gaia-DR2zeta>{{cite DR2|6622197425577482752}}</ref> It is a suspected variable star.<ref name=Demartino1996>{{cite journal| last1=Demartino | first1=Robert | last2=Kocyla | first2=Dennis | last3=Predom | first3=Christopher | last4=Wetherbee | first4=Edward | title=Accurate Positions Of Suspected Variable Stars Near The South Galactic Pole | journal=Information Bulletin on Variable Stars | volume=4322 | page=1 | date=1996 | bibcode=1996IBVS.4322....1D }}</ref>

[[S Piscis Austrini]] is a long-period Mira-type variable red giant which ranges between magnitude 8.0 and 14.5 over a period of 271.7 days, and [[V Piscis Austrini]] is a semi-regular variable ranging between magnitudes 8.0 and 9.0 over 148 days.<ref name=moore11/>

Lacaille 9352 is a faint [[red dwarf]] star of spectral type M0.5V that is just under half the Sun's diameter and mass.<ref name="rabus">{{cite journal |doi=10.1093/mnras/sty3430 |title=A discontinuity in the Teff–radius relation of M-dwarfs |journal=Monthly Notices of the Royal Astronomical Society |volume=484 |issue=2 |pages=2674–2683 |year=2019 |last1=Rabus |first1=Markus |last2=Lachaume |first2=Régis |last3=Jordán |first3=Andrés |last4=Brahm |first4=Rafael |last5=Boyajian |first5=Tabetha |last6=Von Braun |first6=Kaspar |last7=Espinoza |first7=Néstor |last8=Berger |first8=Jean-Philippe |last9=Le Bouquin |first9=Jean-Baptiste |last10=Absil |first10=Olivier |doi-access=free |arxiv=1901.08077 |bibcode=2019MNRAS.484.2674R |s2cid=119189542 }}</ref> A mere 10.74 light-years away, it is too dim to be seen with the naked eye at magnitude 7.34. 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. [[HD 205739]] is a yellow-white main-sequence star of spectral type F7 V that has a planet around 1.37 times as massive as Jupiter orbiting it with a period of 279 days, and a suggestion of a second planet.<ref name="LopezMorales2008">{{cite journal | title=Two Jupiter-Mass Planets Orbiting HD 154672 and HD 205739 | last1=López-Morales | first1=Mercedes | last2=Butler | first2=R. Paul | last3=Fischer | first3=Debra A. | last4=Minniti | first4=Dante | last5=Shectman | first5=Stephen A. | last6=Takeda | first6=Genya | last7=Adams | first7=Fred C. | last8=Wright | first8=Jason T. | last9=Arriagada | first9=Pamela | journal=The Astronomical Journal | volume=136 | issue=5 | pages=1901–1905 | date=2008 | arxiv=0809.1037 | bibcode=2008AJ....136.1901L | doi=10.1088/0004-6256/136/5/1901 | s2cid=119242543 }}</ref> [[HD 216770]] is an orange dwarf accompanied by a Jupiter-like planet every 118 days.<ref name="Mayor2004">{{cite journal | title=The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE | last1=Mayor | first1=M. | last2=Udry | first2=S. | last3=Naef | first3=D. | last4=Pepe | first4=F. | last5=Queloz | first5=D. | last6=Santos | first6=N. C. | last7=Burnet | first7=M. | journal=Astronomy and Astrophysics | volume=415 | issue=1 | pages=391–402 | year=2004 | arxiv=astro-ph/0310316 | bibcode=2004A&A...415..391M | doi=10.1051/0004-6361:20034250 | s2cid=5233877 }}</ref> [[HD 207832]] is a star of spectral type G5V with a diameter and mass about 90% of that of the Sun, and around 77% of its luminosity. Two gas giant planets with masses around 56% and 73% that of Jupiter were discovered in 2012 via the radial velocity method. With orbits of 162 and 1156 days, they average around 0.57 and 2.11 astronomical units away from their star.<ref>{{cite journal |last1=Haghighipour |first1=Nader |last2=Butler |first2=R. Paul |last3=Rivera |first3=Eugenio J. |last4=Henry |first4=Gregory W. |last5=Vogt |first5=Steven S. |title=The Lick-Carnegie Survey: A new two-planet system around the star HD 207832 |journal=The Astrophysical Journal |date=  2012 |volume=756 |issue=1 |pages=91 |doi=10.1088/0004-637X/756/1/91|arxiv=1207.2806 |bibcode=2012ApJ...756...91H |s2cid=1137984 }}</ref>

[[WASP-112]] and [[WASP-124]] are two sun-like stars that have planets discovered by transit.

===Deep sky objects===
[[NGC 7172]], [[NGC 7174]] and [[NGC 7314]] are three galaxies of magnitudes 11.9, 12.5 and 10.9, respectively.<ref name=moore11/> [[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 [[blazar]]s in the sky.<ref>{{Cite journal|author1=Aharonian, F. |author2=Akhperjanian, A. G. |author3=Bazer-Bachi, A. R. |author4=Behera, B. |author5=Beilicke, M. |author6=Benbow, W. |author7=Berge, D. |author8=Bernlöhr, K. |author9=Boisson, C. |author10=Bolz, O. |author11=Borrel, V. |author12=Boutelier, T. |author13=Braun, I. |author14=Brion, E. |author15=Brown, A. M. |author16=Bühler, R. |author17=Büsching, I. |author18=Bulik, T. |author19=Carrigan, S. |author20=Chadwick, P. M. |author21=Clapson, A. C. |author22=Chounet, L.-M. |author23=Coignet, G. |author24=Cornils, R. |author25=Costamante, L. |author26=Degrange, B. |author27=Dickinson, H. J. |author28=Djannati-Ataï, A. |author29=Domainko, W. |author30=Drury, L. O'C. |author31=Dubus, G. |author32=Dyks, J. |author33=Egberts, K. |author34=Emmanoulopoulos, D. |author35=Espigat, P. |author36=Farnier, C. |author37=Feinstein, F. |author38=Fiasson, A. |author39=Förster, A. |author40=Fontaine, G. |author41=Funk, Seb. |author42=Funk, S. |author43=Füßling, M. |author44=Gallant, Y. A. |author45=Giebels, B. |author46=Glicenstein, J. F. |author47=Glück, B. |author48=Goret, P. |author49=Hadjichristidis, C. |author50=Hauser, D. |author51=Hauser, M. |author52=Heinzelmann, G. |author53=Henri, G. |author54=Hermann, G. |author55=Hinton, J. A. |author56=Hoffmann, A. |author57=Hofmann, W. |author58=Holleran, M. |author59=Hoppe, S. |author60=Horns, D. |author61=Jacholkowska, A. |author62=de Jager, O. C. |author63=Kendziorra, E. |author64=Kerschhaggl, M. |author65=Khélifi, B. |author66=Komin, Nu. |author67=Kosack, K. |author68=Lamanna, G. |author69=Latham, I. J. |author70=Le Gallou, R. |author71=Lemière, A. |author72=Lemoine-Goumard, M. |author73=Lenain, J.-P. |author74=Lohse, T. |author75=Martin, J. M. |author76=Martineau-Huynh, O. |author77=Marcowith, A. |author78=Masterson, C. |author79=Maurin, G. |author80=McComb, T. J. L. |author81=Moderski, R. |author82=Moulin, E. |author83=de Naurois, M. |author84=Nedbal, D. |author85=Nolan, S. J. |author86=Olive, J.-P. |author87=Orford, K. J. |author88=Osborne, J. L. |author89=Ostrowski, M. |author90=Panter, M. |author91=Pedaletti, G. |author92=Pelletier, G. |author93=Petrucci, P.-O. |author94=Pita, S. |author95=Pühlhofer, G. |author96=Punch, M. |author97=Ranchon, S. |author98=Raubenheimer, B. C. |author99=Raue, M. |display-authors=1 |author100=Rayner, S. M. |author101=Renaud, M. |author102=Ripken, J. |author103=Rob, L. |author104=Rolland, L. |author105=Rosier-Lees, S. |author106=Rowell, G. |author107=Rudak, B. |author108=Ruppel, J. |author109=Sahakian, V. |author110=Santangelo, A. |author111=Saugé, L. |author112=Schlenker, S. |author113=Schlickeiser, R. |author114=Schröder, R. |author115=Schwanke, U. |author116=Schwarzburg, S. |author117=Schwemmer, S. |author118=Shalchi, A. |author119=Sol, H. |author120=Spangler, D. |author121=Stawarz, Ł. |author122=Steenkamp, R. |author123=Stegmann, C. |author124=Superina, G. |author125=Tam, P. H. |author126=Tavernet, J.-P. |author127=Terrier, R. |author128=van Eldik, C. |author129=Vasileiadis, G. |author130=Venter, C. |author131=Vialle, J. P. |author132=Vincent, P. |author133=Vivier, M. |author134=Völk, H. J. |author135=Volpe, F. |author136=Wagner, S. J. |author137=Ward, M. |author138=Zdziarski, A. A. |title=An Exceptional VHE Gamma-Ray Flare of PKS 2155-304|journal=The Astrophysical Journal|volume=664|issue=2|pages=L71–L78|arxiv=0706.0797|year=2007|doi=10.1086/520635|bibcode = 2007ApJ...664L..71A |s2cid=119319369}}</ref>

==See also==
* [[Piscis Austrinus in Chinese astronomy]]

==Notes==
{{Notelist}}

==References==
{{Reflist}}

==External links==
{{Commons and category|Piscis Austrinus|Piscis_Austrinus}}
* [https://iconographic.warburg.sas.ac.uk/category/vpc-taxonomy-017073 Warburg Institute Iconographic Database (medieval and early modern images of Piscis Austrinus under the name Piscis magnus)]
* [http://astrojan.nhely.hu/piscisau.htm The clickable Piscis Austrinus]

{{Stars of Piscis Austrinus}}
{{Constellations}}
{{Portal bar|Astronomy|Stars|Outer space}}
{{Authority control}}

{{Sky|22|00|00|-|30|00|00|10}}

{{DEFAULTSORT:Piscis Austrinus}}
[[Category:Piscis Austrinus| ]]
[[Category:Constellations]]
[[Category:Southern constellations]]
[[Category:Constellations listed by Ptolemy]]