29 Persei
Star in the constellation Perseus
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29 Persei is a single[13] star in the northern constellation of Perseus, located approximately 640 light years away from the Sun based on parallax.[1] It is visible to the naked eye as faint, blue-white hued star with an apparent visual magnitude of 5.16.[2] This object is a member of the Alpha Persei Cluster.[14][15]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 18m 37.74077s[1] |
| Declination | +50° 13′ 19.8341″[1] |
| Apparent magnitude (V) | 5.16[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | B3V[3] |
| U−B color index | −0.56[4] |
| B−V color index | −0.06[4] |
| Astrometry | |
| Radial velocity (Rv) | −1.50[5] km/s |
| Proper motion (μ) | RA: +23.574[1] mas/yr Dec.: −24.407[1] mas/yr |
| Parallax (π) | 5.12±0.29 mas[1] |
| Distance | 640 ± 40 ly (200 ± 10 pc) |
| Absolute magnitude (MV) | −1.31[6] |
| Details | |
| Mass | 6.8[7] M☉ |
| Radius | 3.9[8] R☉ |
| Luminosity | 960[6] L☉ |
| Surface gravity (log g) | 4.025±0.113[9] cgs |
| Temperature | 16,143[6] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Rotational velocity (v sin i) | 120[11] km/s |
| Other designations | |
| 29 Per, BD+49°899, FK5 2188, GC 3934, HD 20365, HIP 15404, HR 987, SAO 23944[12] | |
| Database references | |
| SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B3 V.[3] During the 1930s it was reported to have a variable radial velocity, but that may instead have been due to instrument error.[16] The star has a high rate of spin, showing a projected rotational velocity of 120 km/s.[11] It has 6.8[7] times the mass of the Sun and about 3.9[8] times the Sun's radius. 29 Persei is radiating 960 times the Sun's luminosity from its photosphere at an effective temperature of 16,143 K.[6]