TW Horologii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 03h 12m 33.160s[1] |
| Declination | −57° 19′ 17.5790″ [1] |
| Apparent magnitude (V) | +5.71 |
| Characteristics | |
| Spectral type | C |
| Astrometry | |
| Radial velocity (Rv) | 14.3 ± 2 km/s |
| Proper motion (μ) | RA: 18.44 ± 0.31[1] mas/yr Dec.: 13.20 ± 0.35[1] mas/yr |
| Parallax (π) | 3.11 ± 0.37 mas[1] |
| Distance | approx. 1,000 ly (approx. 320 pc) |
| Other designations | |
TW Horologii is a star in the constellation Horologium. A semiregular variable and ageing red giant, it is in the asymptotic giant branch stage of its lifespan.[3]
TW Horologii is too far from earth for its parallax to be measured effectively; Guandalini and Cristallo calculated the luminosity of Mira variables based on their periods. Using a period of 158 days, they calculated the absolute magnitude of TW Horologii to be -4.62.[3]
References
- ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- ^ "TW Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 March 2016.
- ^ a b Guandalini, R.; Cristallo, S. (2013). "Luminosities of carbon-rich asymptotic giant branch stars in the Milky Way". Astronomy & Astrophysics. 555. arXiv:1305.4203. Bibcode:2013A&A...555A.120G. doi:10.1051/0004-6361/201321225. A120 pages = 7.
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