Epsilon Trianguli Australis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.11[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B Template:Engvar | +1.16[2] |
| B−V Template:Engvar | +1.17[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[4] km/s |
| Proper motion (μ) | RA: +24.35[1] mas/yr Dec.: −54.47[1] mas/yr |
| Parallax (π) | 16.17±0.18 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute bolometric magnitude (Mbol) | Script error: No such module "val".[5] |
| Details[5] | |
| Mass | 1-2 Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 91 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | 4,436 K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[6] | |
| Database references | |
| SIMBAD | data |
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Epsilon Trianguli Australis, Latinized from ε Trianguli Australis, is a star in the southern circumpolar constellation of Triangulum Australe. It is visible to the naked eye with an apparent visual magnitude of +4.11.[2] Based upon an annual parallax shift of 16.17 mas as seen from the Earth,[1] the star is located about 340 light years from the Sun. The star is moving closer to the Sun with a radial velocity of around −15.5 km/s.[4]
This is an evolved K-type giant star with a stellar classification of K0 III.[3] It has around 1−2 times the mass of the Sun and has expanded to 16.2 times the Sun's radius. The star is radiating 91 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,039 K.[5] It has an A5 type[7] magnitude 9.36 companion at an angular separation of 81.9 arc seconds along a position angle of 220°, as of 2010.[8] The pair may form a wide binary system.[7]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1". "Optical pair, based on study of relative motion of the components using the method of apparent motion parameters. —DUN 188"
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