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Proper NameNone
Bayer DesignationEta Piscis Austrini
Flamsteed Number12 Piscis Austrini
HR (BSC)8386
ConstellationPiscis Austrinus
Right Ascension22h 0m 50s (A), 22h 0m 50s (B)
Declination-28° 27' 13" (A), -28° 27' 14" (B)
Distance817 light years
251 parsecs
MagnitudeApparent: +5.72 (A), +6.78 (B)
Absolute: -1.21 (A), -0.22 (B)
Spectral ClassB8III blue giant (A), B8.5IV blue subgiant (B)
Optimum VisibilitySeptember
NotesEta Piscis Austrini is a binary system consisting of two hot blue stars. The more massive of these is a blue shell star, spinning rapidly on its axis and likely surrounded by a disc of ejected material. The less massive secondary star, also blue in colour, orbits the primary over a period of 178 days.

Though Eta Piscis Austrini is a binary system, its two blue component stars cannot be separately distinguished in this image. Eta Piscis Austrini lies against a background of distant galaxies, of which two are prominent here: lenticular PGC 67836 to the north of the star, and spiral PGC 67845 to the southeast. Imagery provided by Aladin sky atlas


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