5 Tauri
5 Tauri is a binary star in the zodiac constellation of Taurus, located approximately 530 light years from the Sun. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of +4.14. It is moving further from the Earth with a heliocentric radial velocity of +14 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 30m 52.38296s |
| Declination | +12° 56′ 12.0489″ |
| Apparent magnitude (V) | +4.14 |
| Characteristics | |
| Spectral type | K0-III |
| U−B color index | +0.95 |
| B−V color index | +1.09 |
| Astrometry | |
| Radial velocity (Rv) | 14.2±0.3 km/s |
| Proper motion (μ) | RA: 13.537 mas/yr Dec.: -2.037 mas/yr |
| Parallax (π) | 6.1081 ± 0.3907 mas |
| Distance | 530 ± 30 ly (160 ± 10 pc) |
| Absolute magnitude (MV) | −0.96 |
| Orbit | |
| Primary | 5 Tauri A |
| Companion | 5 Tauri B |
| Period (P) | 960 days |
| Semi-major axis (a) | 4.25 mas |
| Eccentricity (e) | 0.397±0.016 |
| Inclination (i) | 36.95° |
| Longitude of the node (Ω) | 207.61° |
| Periastron epoch (T) | 2,414,889.565±5.82 |
| Argument of periastron (ω) (secondary) | 326.32±2.99° |
| Semi-amplitude (K1) (primary) | 8.25±0.15 km/s |
| Details | |
| 5 Tauri A | |
| Mass | 4.0±0.7 M☉ |
| Radius | 8.5 R☉ |
| Luminosity | 329.38 L☉ |
| Surface gravity (log g) | 1.97 cgs |
| Temperature | 4,644 K |
| Metallicity [Fe/H] | 0.05 dex |
| Rotational velocity (v sin i) | 10 km/s |
| 5 Tauri B | |
| Mass | 1.13±0.13 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a spectroscopic binary with a period of 960 days and an eccentricity of about 0.4. The primary component is a K-type giant with a stellar classification of K0-III. It has four times the mass of the Sun and is radiating 329 times the Sun's luminosity from its photosphere at an effective temperature of 4,644 K.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.