Girish Mahajan

5 Persei

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Magnitude  6.35
Constellation  Perseus
5 Persei
People also search for  20 Persei, 2 Persei, 1 Persei, 14 Persei

5 Persei is a blue supergiant star in the constellation Perseus located around 2,950 parsecs (9,600 ly) away. It is part of the Perseus OB1 stellar association and lies near the Double Cluster.

Contents

Companions

5 Persei has two close companions, a 12th magnitude star 5.7 arc-seconds away and a 13th magnitude star one arc-minute away.

Variability

Several studies of 5 Persei have detected possible small amplitude variations. In 1983, an amplitude of 0.045 magnitudes was measured with a possible period of eight days. An analysis of Hipparcos photometry showed an amplitude of 0.0168 magnitudes and a period of 2.65 days. The statistical signal was strong enough for the variability to be very likely, but 5 Persei has not formally been catalogued as a variable star.

Properties

The primary, with an apparent magnitude of 6.27, is a blue supergiant of spectral type B5 Ia, a massive star that has used up its core hydrogen and expanded into a very luminous star. It has a temperature around 15,000 K.

References

5 Persei Wikipedia


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