Epoch J2000 Equinox J2000
|Right ascension||18h 26m 58.41604s|
|Declination||–45° 58′ 06.4498″|
|Apparent magnitude (V)||3.51|
|Spectral type||B3 IV|
|U−B color index||−0.64|
|B−V color index||−0.17|
|Radial velocity (Rv)||−0.2 km/s|
|Proper motion (μ)||RA: −16.95 mas/yr
Dec.: −53.09 mas/yr
|Parallax (π)||11.74 ± 0.17 mas|
|Distance||278 ± 4 ly
(85 ± 1 pc)
|Mass||5.2 ± 0.4 M☉|
|Radius||3.3 ± 0.5 R☉|
|Surface gravity (log g)||4.12 ± 0.20 cgs|
|Temperature||16,700 ± 800 K|
|Rotational velocity (v sin i)||14 ± 8 km/s|
|Age||24.1 ± 7.5 Myr|
Alpha Telescopii (α Tel, α Telescopii) is the brightest star in the constellation Telescopium, with an apparent visual magnitude of 3.5. Ptolemy included it in constellation Corona Australis, but it was moved to Telescopium when that constellation was created by Nicolas Louis de Lacaille in the 18th century. Parallax measurements put it at a distance of 278 light-years (85 parsecs) from Earth.
This star is much larger than the Sun, with about five times the mass and three times the radius. The spectrum of the star matches a stellar classification of B3 IV, where the luminosity class of 'IV' indicates this is a subgiant star that has nearly exhausted the supply of hydrogen at its core and is evolving away from the main sequence. Alpha Telescopii is a bright star that is radiating nearly 800 times the Sun's luminosity. This energy is being emitted from the star's outer envelope at an effective temperature of around 16,700 K, giving it the characteristic blue-white hue of a B-type star.
This is a type of variable star known as a slowly pulsating B star. It has a longitudinal magnetic field with a mean strength of –233 ± 43 G. A projected stellar rotation velocity of about 14 km s–1 is considered low for a star of this type, which may indicate it is being viewed from nearly pole-on.
- van Leeuwen, F. (November 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
- Johnson, H. L. et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J.
- Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H
- Hubrig, S. et al. (April 2009), New magnetic field measurements of β Cephei stars and slowly pulsating B stars, Astronomische Nachrichten 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187
- Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E
- Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun, Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x
- alf Tel -- Star, SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2012-01-15
- Ridpath, Ian, Corona Austalis, the Southern Crown, Ian Ridpath's Star Tales, retrieved 2012-01-15
- The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16
- Kaler, James B., ALPHA TEL (Alpha Telescopii), Stars (University of Illinois), retrieved 2012-01-15