Iota Trianguli Australis
Epoch J2000.0 Equinox J2000.0
|Right ascension||16h 27m 57.3s|
|Declination||−64° 03' 29"|
|Apparent magnitude (V)||+5.28|
|Distance||132 ± 4 ly
(40 ± 1 pc)
It shows itself to be composed of a yellow and a white star when seen though a 7.5 cm telescope.
The primary component, Iota Trianguli Australis A, is a spectroscopic binary with a mean apparent magnitude of +5.28. Both components of the binary star are yellow-white F-type stars and they have an orbital period of 39.8 days. One of the components of the binary is also classified as a Gamma Doradus type variable star, and the binary's brightness varies by 0.12 magnitudes over a period of 1.45 days. The third component of the star system, Iota Trianguli Australis B, is a 10th magnitude star, 20 arcseconds away from the primary.
- Hartung, Ernst Johannes (1984). Astronomical Objects for Southern Telescopes, with an Addendum for Northern Observatories: A Handbook for Amateur Observers. CUP Archive. p. 214. ISBN 0521318874.
- De Cat, P.; Wright, D. J.; Pollard, K. R.; Maisonneuve, F.; Kilmartin, P. M. (2009). "Is HD147787 a double-lined binary with two pulsating components? Preliminary results from a spectroscopic multi-site campaign". AIP Conference Proceedings 1170: 483–85. doi:10.1063/1.3246549.
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