Star profile
Theta Persei
Nearby starWhat is Theta Persei
Theta Persei lies just 36 light-years away, a solar neighbour of spectral type F7, 1.3 times the Sun's radius and slightly hotter. It shines with a calm yellow-white light in a constellation otherwise dominated by distant giants like Mirfak and Algol. The light reaching us tonight set out around 1990: a recent conversation, on a stellar scale, between Perseus and us.
Where it is and when to see it
Theta Persei lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is November, when it culminates around midnight.
- From London it never sets and culminates about 88° up.
- From New York it culminates about 81° above the horizon.
- From Sydney it culminates about 7° above the horizon.
It can be seen from anywhere north of 41° S.
It ranks no. 17 in brightness among the 99 stars of Perseus in our catalogue. To find it, start from Mirfak, the brightest: it lies about 7° away (a fist at arm's length covers about 10°).
The light you see today left it about 36 years ago.
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Astronomical data for Theta Persei
- Constellation
- Perseus
- Apparent magnitude
- 4.10
- Distance
- 36.3 light years
- Coordinates (J2000)
- RA 41.050° · Dec 49.228°
- Catalogue
- HIP 12777 · HD 16895
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Other stars in Perseus
Perseus has 99 stars in Stelvia's catalogue. Here are a few of them.
- MirfakAlpha Persei1.79
- AlgolBeta Persei2.09
- Zeta Persei2.84
- MenkibXi Persei3.98
- Phi Persei4.01
- Iota Persei4.05
- Mu Persei4.12
- 16 Persei4.22