X Trianguli Australis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 15h 14m 19.17535s [1] |
| Declination | −70° 04′ 46.1052″ [1] |
| Apparent magnitude (V) | +5.63 |
| Distance | 1173 ly (360 pc) |
| Spectral type | C5.5(Nb). |
| Other designations | |
X Trianguli Australis is a star in the constellation Triangulum Australe. It is a red-hued carbon star with an average apparent magnitude of +5.89. It is approximately 1173 light years (360 parsecs) from Earth,[1] though this could vary by up to 200 light years.[2] It is a semi-regular variable star with two periods of around 385 and 455 days, and is of spectral type C5.5(Nb).[3] It ranges from magnitudes 5.03 to 6.05.[4] Its designation is from the variable star designation developed by German astronomer Friedrich Wilhelm Argelander.
It is a cool star, with estimates of its surface temperature ranging from 2200 to 2700 Kelvin.[2] A giant star, its diameter is 400 times that of the sun, and if placed at the center of the Solar System would stretch out to 30% further than Mars' orbit. Its absolute magnitude is −2.0.[2]
References
- 1 2 3 "X Trianguli Australis – Carbon Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 18 January 2013.
- 1 2 3 Kaler, Jim (19 October 2012). "X Trianguli Australis". Stars. University of Illinois. Retrieved 18 January 2013.
- ↑ Tabur, V.; Bedding, T. R. (2009). "Long-term Photometry and Periods for 261 Nearby Pulsating M Giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228
. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. - ↑ "X TrA". International Variable Star Index. American Association of Variable Star Observers. 11 November 2011. Retrieved 18 January 2013.