Theta Piscis Austrini
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Piscis Austrinus |
| Right ascension | 21h 47m 44.150s[1] |
| Declination | –30° 53′ 53.90″[1] |
| Apparent magnitude (V) | +5.02 |
| Characteristics | |
| Spectral type | A1V + A1V[2] |
| Astrometry | |
| Proper motion (μ) | RA: –34.40 ± 0.34[1] mas/yr Dec.: –0.08 ± 0.33[1] mas/yr |
| Parallax (π) | 11.17 ± 0.41 mas[2] |
| Distance | 290 ± 10 ly (90 ± 3 pc) |
| Details | |
| Other designations | |
Theta Piscis Austrini (Theta PsA, θ Piscis Austrini, θ PsA) is multiple star system in constellation of Piscis Austrinus, with an apparent magnitude of +5.02. The primary component is a white A-type main sequence star. It is approximately 290 light years from Earth.[2]
Theta Piscis Austrini is moving through the Galaxy at a speed of 21.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,600 and 38,300 light years from the center of the Galaxy.[4]
Theta Piscis Austrini came closest to the Sun 2.7 million years ago when it had brightened to magnitude 4.54 from a distance of 256 light years.[4]
Naming
In Chinese, 天錢 (Tiān Qián), meaning Celestial Money, refers to an asterism consisting of refers to an asterism consisting of θ Piscis Austrini, 13 Piscis Austrini, ι Piscis Austrini, μ Piscis Austrini and τ Piscis Austrini. Consequently, θ Piscis Austrini itself is known as 天錢二 (Tiān Qián èr, English: the Second Star of Celestial Money.)[5]
References
- ^ a b c d 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. Vizier catalog entry
- ^ a b c Docobo, J. A.; Andrade, M. (2013). "Dynamical and physical properties of 22 binaries discovered by W. S. Finsen". Monthly Notices of the Royal Astronomical Society. 428 (1): 321–339. Bibcode:2013MNRAS.428..321D. doi:10.1093/mnras/sts045.
- ^ "* tet PsA -- Double or multiple star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg. Retrieved 2014-12-28.
- ^ a b Theta Piscis Austrini (HIP 107608)
- ^ Template:Zh icon AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日
