37 Tauri
Star in the constellation Taurus
From Wikipedia, the free encyclopedia
37 Tauri is a single,[9] 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.[2] A magnitude 10.01 visual companion has an angular separation of 134.30″ on a position angle of 138.6°, as of 2003.[10] Based on an annual parallax shift of 17.43±0.21 mas,[1] 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.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 04m 41.71484s[1] |
| Declination | +22° 04′ 54.9243″[1] |
| Apparent magnitude (V) | 4.36[2] |
| Characteristics | |
| Spectral type | K0 III-IIIb[3] |
| U−B color index | 0.95[4] |
| B−V color index | 1.07[5] |
| R−I color index | 0.53[4] |
| Astrometry | |
| Radial velocity (Rv) | +9.52±0.11[6] km/s |
| Proper motion (μ) | RA: +90.53[1] mas/yr Dec.: −59.47[1] mas/yr |
| Parallax (π) | 17.43±0.21 mas[1] |
| Distance | 187 ± 2 ly (57.4 ± 0.7 pc) |
| Absolute magnitude (MV) | 0.57[2] |
| Details | |
| Mass | 1.99[5] M☉ |
| Radius | 10.15±0.69[7] R☉ |
| Luminosity | 60±6[7] L☉ |
| Surface gravity (log g) | 2.77[7] cgs |
| Temperature | 4,732±26[5] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Rotational velocity (v sin i) | 2.8[6] km/s |
| Age | 1.39[5] Gyr |
| Other designations | |
| 37 Tau, BD+21°585, FK5 1112, HD 25604, HIP 19038, HR 1256, SAO 76430, WDS J04047+2205A[8] | |
| Database references | |
| SIMBAD | data |
This is an evolved K-type giant star with a stellar classification of K0 III-IIIb.[3] At the age of 1.39[5] billion years, it has become a red clump giant, indicating that it is generating energy through helium fusion at its core.[11] The star has around double the mass of the Sun and has expanded to 10[7] times the Sun's radius. It is radiating roughly 60[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,732 K.[5]
Chinese astronomy
In Chinese astronomy, 37 Tauri is called 月, Pinyin: Yuè, meaning Moon, because this star is marking itself and stand alone in Moon asterism, Hairy Head mansion (see: Chinese constellation).[12]