Gamma Tucanae
Template:Location mark Location of γ Tucanae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.99[2] |
| Characteristics | |
| Spectral type | F1 III[2][3] or F3 IV/V[4] or F4 V[5] |
| U−B Template:Engvar | -0.02[6] |
| B−V Template:Engvar | +0.39[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: −35.83[1] mas/yr Dec.: +81.16[1] mas/yr |
| Parallax (π) | 43.37±0.63 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.18[8] |
| Details | |
| Mass | 1.55[2] Template:Solar mass |
| Radius | 2.2[9] Template:Solar radius |
| Luminosity | 11.33[8] Template:Solar luminosity |
| Surface gravity (log g) | 3.92[10] cgs |
| Temperature | 6,679[10] K |
| Metallicity [Fe/H] | −0.22[8] dex |
| Rotational velocity (v sin i) | 94[11] km/s |
| Age | 1.414[10] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12] | |
| Database references | |
| SIMBAD | data |
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Gamma Tucanae, Latinized from γ Tucanae, is a star in the constellation Tucana, marking the toucan's beak.[13] It is faintly visible to the naked eye with an apparent visual magnitude of +3.99.[2] Based upon an annual parallax shift of 43.37 mas as seen from Earth,[1] this star is located about 75 light years from the Sun. It is moving away from the Sun with a radial velocity of +18 km/s.[7]
There is disagreement in the literature as to the stellar classification of this star. Malaroda (1975) has it catalogued as F1 III, which would suggest it is an evolved F-type giant star.[3] Houk (1979) listed it as F3 IV/V, which appears to indicate a less evolved F-type star transitioning between the main sequence and subgiant star.[4] Gray et al. (2006) has it classed as F4 V, which would match an ordinary F-type main-sequence star.[5]
This star is a suspected astrometric binary.[14] The visible component has 1.55 times the mass of the Sun[2] and 2.2[9] times the Sun's radius. At the age of around 1.4[10] billion years, it retains a relatively high rate of spin with a projected rotational velocity of 94 km/s.[11] It is radiating 11[8] times the Sun's luminosity from its photosphere at an effective temperature of 6,679 K.[10]
Gamma Tucanae may (95% chance) have a distant co-moving companion – a magnitude 6.64 G-type main-sequence star of class G0 V designated HD 223913. This object has the same mass as the Sun and is separated from Gamma Tucanae by about Script error: No such module "convert"..[15]
References
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- ↑ a b c d e f Script error: No such module "Citation/CS1". Vizier catalog entry
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- ↑ a b c d Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b c d e Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b Script error: No such module "Citation/CS1".
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