Star profile

30 Piscium

Variable star

3D likeness based on its real data · class M · ~3,200 K

What is 30 Piscium

30 Piscium —also catalogued as YY Piscium— is an aged red giant that has exhausted the hydrogen in its core and swelled to about 109 solar radii. Its brightness drifts gently between magnitudes 4.31 and 4.41 with no clean period, hinting at cycles of 23, 32, 53 and 167 days. Its light takes 432 years to reach us, having set out around the time Shakespeare was writing his last plays.

Where it is and when to see it

30 Piscium lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is September, when it culminates around midnight.

From London it culminates about 32° above the horizon.
From New York it culminates about 43° above the horizon.
From Sydney it culminates about 62° above the horizon.

It can be seen from anywhere south of 84° N.

It ranks no. 9 in brightness among the 79 stars of Pisces in our catalogue. To find it, start from Alpherg, the brightest: it lies about 31° away (a fist at arm's length covers about 10°).

The light you see today left it about 430 years ago.

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Astronomical data for 30 Piscium

Constellation: Pisces
Apparent magnitude: 4.37
Distance: 432.1 light years
Coordinates (J2000): RA 0.490° · Dec -6.014°
Catalogue: HIP 154 · HD 224935

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Other stars in Pisces

Pisces has 79 stars in Stelvia's catalogue. Here are a few of them.

See all 79 stars in Pisces