30 Piscium

30 Piscium (HIP 154) is a solitary variable star in the zodiac constellation of Pisces. It is visible to the naked eye with an apparent visual magnitude of 4.37. The distance to this star, based upon an annual parallax shift of , is around 410 light years. It is moving closer  with a heliocentric radial velocity of −12 km/s.

This is an aging red giant star with a stellar classification of M3 III, indicating it has exhausted the hydrogen at its core and evolved off the main sequence. It is a candidate long-period variable star and has been given the designation YY Psc. Its varies in brightness between magnitudes 4.31 and 4.41 with no clear period. Possible periods of 23.1, 32.0, 53.6, and 167.8 days have been identified. The star has 74 times the Sun's radius and is radiating 1,148.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,647 K.

References

Category:M-type giants
Category:Slow irregular variables
Category:Pisces (constellation)
Category:Durchmusterung objects
Piscium, 030
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Piscium, YY