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 | |
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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