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Eta Piscis Austrini

12 Piscis Austrini

Blue giant in Piscis Austrinus

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Proper Name	None
Bayer Designation	Eta Piscis Austrini
Flamsteed Number	12 Piscis Austrini
HR (BSC)	8386
HD	209014
Constellation	Piscis Austrinus
Right Ascension	22h 0m 50s (A), 22h 0m 50s (B)
Declination	-28° 27' 13" (A), -28° 27' 14" (B)
Distance	817 light years 251 parsecs
Magnitude	Apparent: +5.72 (A), +6.78 (B) Absolute: -1.21 (A), -0.22 (B)
Spectral Class	B8III blue giant (A), B8.5IV blue subgiant (B)
Optimum Visibility	September
Notes	Eta 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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Piscis Austrinus

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