| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 05h 19m 16.60169s[1] |
| Declination | +22° 05′ 47.3740″[1] |
| Apparent magnitude (V) | 4.96[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| B−Vcolor index | 0.937±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.03±0.01[4] km/s |
| Proper motion (μ) | RA: +18.91[1]mas/yr Dec.: −81.57[1]mas/yr |
| Parallax (π) | 13.19±0.30 mas[1] |
| Distance | 247 ± 6 ly (76 ± 2 pc) |
| Absolute magnitude (MV) | 0.56[2] |
| Details[4] | |
| Mass | 2.47±0.08 M☉ |
| Radius | 8.14±0.46 R☉ |
| Luminosity | 60+10 −12 L☉ |
| Surface gravity (log g) | 2.96±0.01 cgs |
| Temperature | 5,035±23 K |
| Metallicity [Fe/H] | 0.10±0.04 dex |
| Rotational velocity (v sin i) | 1.15±0.62 km/s |
| Age | 600±50 Myr |
| Other designations | |
| n Tau,109 Tau,BD+21° 816,FK5 2398,HD 34559,HIP 24822,HR 1739,SAO 77097[5] | |
| Database references | |
| SIMBAD | data |
109 Tauri, orn Tauri, is a single,[6] yellow-huedstar in thezodiacconstellation ofTaurus. It has anapparent visual magnitude of 4.96[2] and is faintly visible to the naked eye. The star has an annualparallax shift of13.19±0.30 mas,[1] putting it around 247 light years from the Sun. At that distance, the visual magnitude is diminished by anextinction of 0.24 due tointerstellar dust.[4] It is moving further from the Sun with a heliocentricradial velocity of +19 km/s.[4]
This is anevolvedgiant star with astellar classification of G8 III,[3] having consumed the hydrogen at itscore and moved off themain sequence. At the age of 600[4] million years, it has become ared clump giant, indicating that it is on thehorizontal branch and is generating energy throughhelium fusion at its core.[7] The star has an estimated 2.47 times themass of the Sun and has expanded to around eight times theSun's radius. It is radiating about 60 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of 5,035 K.[4]
