Eta Tucanae
Template:Location mark Location of η Tucanae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +5.00[2] |
| Characteristics | |
| Spectral type | A1V[2] |
| U−B Template:Engvar | +0.08[3] |
| B−V Template:Engvar | +0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | +32.50[4] km/s |
| Proper motion (μ) | RA: +78.850[1] mas/yr Dec.: −62.049[1] mas/yr |
| Parallax (π) | 21.2425±0.3639 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 1.62[5] |
| Details | |
| Mass | 1.94[6] Template:Solar mass |
| Radius | 1.8[7] Template:Solar radius |
| Luminosity | 23[8] Template:Solar luminosity |
| Surface gravity (log g) | 4.31[9] cgs |
| Temperature | 9,057[8] K |
| Rotational velocity (v sin i) | 190[6] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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Eta Tucanae, Latinized from η Tucanae, is a probable binary star[6] system in the southern constellation of Tucana, a few degrees to the north of Epsilon Tucanae. It is visible to the naked eye as a dim, white-hued point of light with an apparent visual magnitude of +5.00.[2] parallax measurements provide a distance estimate of about 154 light years from the Sun, and it is drifting further away with a mean radial velocity of +32.5 km/s.[4] It is a member of the 30 million year old Tucana-Horologium association of co-moving stars.[6][2]
The radial velocity for Eta Tucanae displays strong oscillations, suggesting this is a spectroscopic binary system. A companion was directly detected in 2014, but this result has some unexplained anomalies.[6] The primary component is an A-type main-sequence star with a stellar classification of A1V.[2] It is spinning rapidly with a projected rotational velocity of 190 km/s,[6] giving it an equatorial bulge that is 15% larger than the polar radius.[11] The star has 1.9[6] times the mass of the Sun and 1.8[7] times the Sun's radius. It is radiating 23[8] times the luminosity of the Sun from its photosphere at an effective temperature of 9,057 K.[8]
References
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- ↑ a b c d e Template:Cite DR2
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- ↑ a b Script error: No such module "Citation/CS1".Vizier catalog entry
- ↑ a b Script error: No such module "Citation/CS1".
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- ↑ a b c d e f g Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b c d Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1".
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