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η Piscium
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 31m 29s
Declination +15° 20' 45"
Apparent magnitude (V) +3.62
Distance 294 ly
(90 pc)
Spectral type G7IIIa
Other designations
η Psc, 99 Psc, HR 437, HD 9270, FK5 50, SAO 92484

Eta Piscium (η Psc / η Piscium) is the brightest star in the constellation Pisces. Eta Piscium is located at a distance of about 294 light years from Earth and shines at magnitude +3.62. It is of Spectral type G7 III. The star, sometimes known as Alpherg (perhaps an error for Alpherd), has an obscure Babylonian proper name Kullat Nunu.

The total luminosity of this star is 316 times that of the Sun while its surface temperature is 4930 kelvins. The star has a radius of 26 times solar while its mass is 3.5 to 4 solar masses.

Eta Piscium has a faint companion star with a separation of about 1".

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