Rho Tucanae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 00h 42m 28.37188s |
| Declination | −65° 28′ 04.9066″ |
| Apparent magnitude (V) | +5.38 |
| Characteristics | |
| Spectral type | F6 V |
| U−B color index | +0.00 |
| B−V color index | +0.50 |
| Astrometry | |
| Radial velocity (Rv) | 33.962±0.796 km/s |
| Proper motion (μ) | RA: +53.444 mas/yr Dec.: +41.180 mas/yr |
| Parallax (π) | 23.6721±0.0631 mas |
| Distance | 137.8 ± 0.4 ly (42.2 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.75 |
| Orbit | |
| Period (P) | 4.8202 d |
| Eccentricity (e) | 0.02 |
| Periastron epoch (T) | 2419299.11 JD |
| Semi-amplitude (K1) (primary) | 26.1 km/s |
| Details | |
| ρ Tuc A | |
| Mass | 1.66 M☉ |
| Luminosity | 9.7 L☉ |
| Surface gravity (log g) | 3.64±0.11 cgs |
| Temperature | 6,034±54 K |
| Metallicity [Fe/H] | −0.26 dex |
| Rotational velocity (v sin i) | 23.5±1.2 km/s |
| Age | 2.64 Gyr |
| ρ Tuc B | |
| Mass | 0.33 M☉ |
| Other designations | |
| ρ Tuc, CPD−66°47, FK5 2047, HD 4089, HIP 3330, HR 187, SAO 248237 | |
| Database references | |
| SIMBAD | data |
Rho Tucanae (ρ Tuc, ρ Tucanae) is a binary star system in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.38. Based upon an annual parallax shift of 23.7 mas as seen from Earth, it is located 138 light years from the Sun.
This is a single-lined spectroscopic binary with a close, nearly circular orbit having a period of 4.82 days and an eccentricity of 0.02. The primary member, component A, is a yellow-white hued F-type main sequence star with a stellar classification of F6 V. It is around 2.6 billion years old and a member of the thin disk population. The primary has about 1.66 times the mass of the Sun while the secondary is just 0.33 times the Sun's mass.