Rho Tauri
Star in the constellation Taurus
From Wikipedia, the free encyclopedia
Rho Tauri (ρ Tau, ρ Tauri) is a binary star[8] in the constellation Taurus and a member of the Hyades star cluster.[10] The system has an apparent magnitude of +4.66[2] and a combined spectral type of A8V.[4] Since one stars (or both) is a Delta Scuti variable,[10] the apparent magnitude varies by 0.010 magnitudes over a period of 1.61 hours.[5]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 33m 50.91753s[1] |
| Declination | +14° 50′ 39.9232″[1] |
| Apparent magnitude (V) | 4.66[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A8V[4] |
| U−B color index | +0.09[2] |
| B−V color index | +0.24[2] |
| Variable type | δ Scuti[5] |
| Astrometry | |
| Radial velocity (Rv) | +39.6[6] km/s |
| Proper motion (μ) | RA: 103.20[1] mas/yr Dec.: −26.48[1] mas/yr |
| Parallax (π) | 20.61±0.57 mas[1] |
| Distance | 158 ± 4 ly (49 ± 1 pc) |
| Absolute magnitude (MV) | +1.26[7] |
| Orbit[8] | |
| Period (P) | 58.94±0.09 days |
| Semi-major axis (a) | 0.48 au |
| Eccentricity (e) | 0.31±0.16 |
| Details[8] | |
| A | |
| Mass | 2.21 M☉ |
| Radius | 1.9[a] R☉ |
| Age | 630 Myr |
| B | |
| Mass | 2.12 M☉ |
| Radius | 1.72[b] R☉ |
| Age | 630 Myr |
| Other designations | |
| ρ Tau, 86 Tau, BD+14 720, FK5 1125, HD 28910, HIP 21273, HR 1444, SAO 94007[9] | |
| Database references | |
| SIMBAD | data |
Characteristics
This is a spectroscopic binary system. The two stars have an orbtial period of 58.94 days and a semi-major axis of 0.48 astronomical units. The primary has a mass of 2.21 solar masses and a radius of 1.90 solar radii, while the secondary has a mass of 2.12 solar masses and a radius of 1.72 solar radii.[8]
Hyades, with ρ Tau appearing blue, left of center, marked with a red arrow
