Sigma Persei
 Location of σ Persei (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 30m 34.48545s |
| Declination | 47° 59′ 42.7808″ |
| Apparent magnitude (V) | 4.36 |
| Characteristics | |
| Spectral type | K3III |
| U−B color index | +1.54 |
| B−V color index | +1.35 |
| Astrometry | |
| Radial velocity (Rv) | +14.36 km/s |
| Proper motion (μ) |
RA: +3.56 mas/yr Dec.: +18.48 mas/yr |
| Parallax (π) | 9.07 ± 0.26mas |
| Distance | 360 ± 10 ly (110 ± 3 pc) |
| Absolute magnitude (MV) | -0.85 |
| Details | |
| Mass | 1.32 M☉ |
| Radius | 36.89 R☉ |
| Luminosity | 368 L☉ |
| Surface gravity (log g) | 1.46 cgs |
| Temperature | 4,165 K |
| Metallicity [Fe/H] | -0.20 dex |
| Rotational velocity (v sin i) | < 1.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma Persei (Sigma Per, σ Persei, σ Per) is an orange K-type giant with an apparent magnitude of +4.36. It is approximately 360 light years from Earth.
Sigma Persei is moving through the Galaxy at a speed of 17.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,400 and 43,600 light years from the center of the Galaxy. It came closest to the Sun 5.1 million years ago when it had brightened to magnitude 3.11 from a distance of 202 light years.
It has one reported planet, b, with a period of 580 days and a mass approximately 6.5 times that of Jupiter.
This star, together with δ Per, ψ Per, α Per, γ Per and η Per, has been called the Segment of Perseus.
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