Xi Persei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 58m 57.90229s |
| Declination | +35° 47′ 27.7132″ |
| Apparent magnitude (V) | 4.04 |
| Characteristics | |
| Spectral type | O7.5III(n)((f)) |
| U−B color index | −0.93 |
| B−V color index | +0.02 |
| Variable type | slightly variable |
| Astrometry | |
| Radial velocity (Rv) | 65.40 km/s |
| Proper motion (μ) | RA: 3.62 mas/yr Dec.: 1.74 mas/yr |
| Parallax (π) | 2.62±0.51 mas |
| Distance | approx. 1,200 ly (approx. 380 pc) |
| Absolute magnitude (MV) | −5.50 |
| Details | |
| Mass | 26-36 M☉ |
| Radius | 14 R☉ |
| Luminosity | 263,000 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 35,000 K |
| Rotational velocity (v sin i) | 220 km/s |
| Age | ~7 Myr |
| Other designations | |
| 46 Per, HR 1228, HD 24912, FK5 148, SAO 56856, HIP 18614, BD+35°775 | |
| Database references | |
| SIMBAD | data |
Xi Persei (ξ Persei, abbreviated Xi Per, ξ Per), known also as Menkib /ˈmɛŋkɪb/, is a star in the constellation of Perseus. Based upon parallax measurements taken during the Hipparcos mission, it is approximately 1,200 light-years from the Sun.