Delta Persei
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 42m 55.50426s |
| Declination | +47° 47′ 15.1746″ |
| Apparent magnitude (V) | 3.01 |
| Characteristics | |
| Spectral type | B5 III |
| U−B color index | –0.51 |
| B−V color index | –0.12 |
| Astrometry | |
| Radial velocity (Rv) | +4 km/s |
| Proper motion (μ) | RA: +25.58 mas/yr Dec.: −43.06 mas/yr |
| Parallax (π) | 6.32±0.47 mas |
| Distance | 520 ± 40 ly (160 ± 10 pc) |
| Details | |
| Mass | 7.0 ± 0.3 M☉ |
| Radius | 10.4±0.6 (equatorial) 9.25±1.60 (polar) R☉ |
| Luminosity | 2,860 L☉ |
| Surface gravity (log g) | 3.5 cgs |
| Temperature | 14,890 K |
| Rotational velocity (v sin i) | 190 km/s |
| Age | 50.1 ± 6.8 Myr |
| Other designations | |
| Sarvvis, δ Per, 39 Per, BD+47 876, FK5 131, GC 4427, HD 22928, HIP 17358, HR 1122, SAO 39053, PPM 46457, CCDM J03429+4748A, WDS J03429+4747A, IDS 03171+4930 A | |
| Database references | |
| SIMBAD | data |
Delta Persei, also named Sarvvis, is a double star in the northern constellation of Perseus. It has an apparent visual magnitude of 3.01, making it readily visible with the naked eye. Parallax measurements give it a distance of about 520 light-years (160 parsecs) from the Earth.