Global InformationTau Sculptoris information
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 01h 36m 08.50799s[1] |
| Declination | −29° 54′ 26.3540″[1] |
| Apparent magnitude (V) | +5.69[2] (6.06 + 7.35)[3] |
| Characteristics | |
| Spectral type | F2 V[4] |
| B−V color index | +0.33[2] |
| Astrometry | |
| Radial velocity (Rv) | +3.00±4.50[5] km/s |
| Proper motion (μ) | RA: +117.37[1] mas/yr Dec.: +46.72[1] mas/yr |
| Parallax (π) | 14.42 ± 0.81 mas[1] |
| Distance | 230 ± 10 ly (69 ± 4 pc) |
| Absolute magnitude (MV) | 2.04 + 3.02[6] |
| Orbit[6] | |
| Period (P) | 1503.58 ± 35.32 yr |
| Semi-major axis (a) | 3.155±0.132″ |
| Eccentricity (e) | 0.604±0.019 |
| Inclination (i) | 55.6±0.8° |
| Longitude of the node (Ω) | 69.6±0.8° |
| Periastron epoch (T) | 2039.79 ± 33.80 |
| Argument of periastron (ω) (secondary) | 140.2±2.8° |
| Details | |
| τ Her A | |
| Mass | 1.56[7] M☉ |
| Surface gravity (log g) | 3.96±0.14[7] cgs |
| Temperature | 7,155±243[7] K |
| Metallicity [Fe/H] | −0.12[8] dex |
| Rotational velocity (v sin i) | 73.8±7.8[9] km/s |
| Age | 1.284[7] Gyr |
| τ Her B | |
| Mass | 1.37[6] M☉ |
| Other designations | |
τ Scl, CD−30° 540, HD 9906, HIP 7463, HR 462, SAO 193201, WDS J01361-2954[10] | |
| Database references | |
| SIMBAD | data |
Tau Sculptoris (τ Scl, τ Sculptoris) is a binary star[6] system in the southern constellation of Sculptor, about 8° to the east-southeast of Alpha Sculptoris.[11] It is faintly visible to the naked eye with a combined apparent visual magnitude of +5.69.[2] Based upon an annual parallax shift of 14.42 mas as seen from Earth,[1] it is located around 230 light years from the Sun.
The binary nature of this system was discovered by English astronomer John Herschel in 1835. The current orbital elements are based upon a fraction of a single orbit, as the estimated orbital period is around 1,503 years. The system has a semimajor axis of 3.2 arc seconds and an eccentricity of 0.6.[6] The primary member, component A, is a yellow-white hued F-type main sequence star with an apparent magnitude of +6.06[3] and a stellar classification of F2 V.[4] The companion, component B, is a magnitude 7.35 star.[3]
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