Theta Piscis Austrini

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Theta Piscis Austrini
Diagram showing star positions and boundaries of the Piscis Austrinus constellation and its surroundings
Cercle rouge 100%.svg

Location of θ Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Piscis Austrinus
Right ascension 21h 47m 44.150s[1]
Declination –30° 53′ 53.90″[1]
Apparent magnitude (V) +5.02
Spectral type A1V + A1V[2]
Proper motion (μ) RA: –34.40 ± 0.34[1] mas/yr
Dec.: –0.08 ± 0.33[1] mas/yr
Parallax (π) 11.17 ± 0.41[2] mas
Distance 290 ± 10 ly
(90 ± 3 pc)
Other designations
HD 207155, HR 8326, CPD–31° 6596, HIP 107608, SAO 213292, WDS J21477-3054AB[3]

Theta Piscis Austrini (Theta PsA, θ Piscis Austrini, θ PsA) is multiple star system in constellation of Piscis Austrinus, with an apparent magnitude of +5.02. The primary component is a white A-type main sequence star. It is approximately 290 light years from Earth.[2]

Theta Piscis Austrini is moving through the Galaxy at a speed of 21.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,600 and 38,300 light years from the center of the Galaxy.[4]

Theta Piscis Austrini came closest to the Sun 2.7 million years ago when it had brightened to magnitude 4.54 from a distance of 256 light years.[4]


In Chinese, 天錢 (Tiān Qián), meaning Celestial Money, refers to an asterism consisting of refers to an asterism consisting of θ Piscis Austrini, 13 Piscis Austrini, ι Piscis Austrini, μ Piscis Austrini and τ Piscis Austrini. Consequently, θ Piscis Austrini itself is known as 天錢二 (Tiān Qián èr, English: the Second Star of Celestial Money.)[5]