37 Tauri
37 Tauri is a single, orange-hued star in the zodiac constellation of Taurus. It can be seen with the naked eye, having an apparent visual magnitude of 4.36. A magnitude 10.01 visual companion has an angular separation of 134.30″ on a position angle of 138.6°, as of 2003. Based on an annual parallax shift of 17.43±0.21 mas, 37 Tauri is about 187 light years away. It is moving further from the Sun with a heliocentric radial velocity of 9.5 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 04m 41.71484s |
| Declination | +22° 04′ 54.9243″ |
| Apparent magnitude (V) | 4.36 |
| Characteristics | |
| Spectral type | K0 III-IIIb |
| U−B color index | 0.95 |
| B−V color index | 1.07 |
| R−I color index | 0.53 |
| Astrometry | |
| Radial velocity (Rv) | +9.52±0.11 km/s |
| Proper motion (μ) | RA: +90.53 mas/yr Dec.: −59.47 mas/yr |
| Parallax (π) | 17.43 ± 0.21 mas |
| Distance | 187 ± 2 ly (57.4 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.57 |
| Details | |
| Mass | 1.99 M☉ |
| Radius | 10.15±0.69 R☉ |
| Luminosity | 60±6 L☉ |
| Surface gravity (log g) | 2.77 cgs |
| Temperature | 4,732±26 K |
| Metallicity [Fe/H] | +0.01 dex |
| Rotational velocity (v sin i) | 2.8 km/s |
| Age | 1.39 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K0 III-IIIb. At the age of 1.39 billion years, it has become a red clump giant, indicating that it is generating energy through helium fusion at its core. The star has around double the mass of the Sun and has expanded to 10 times the Sun's radius. It is radiating roughly 60 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,732 K.