Alpha Telescopii

α Telescopii
Location of α Telescopii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 26m 58.41604s[1]
Declination –45° 58′ 06.4498″[1]
Apparent magnitude (V) 3.51[2]
Characteristics
Spectral type B3 IV[3]
U−B color index −0.64[2]
B−V color index −0.17[2]
Variable type SPB[4]
Astrometry
Radial velocity (Rv)−0.2[5] km/s
Proper motion (μ) RA: −16.95[1] mas/yr
Dec.: −53.09[1] mas/yr
Parallax (π)11.74 ± 0.17 mas[1]
Distance278 ± 4 ly
(85 ± 1 pc)
Absolute magnitude (MV)−1.25[6]
Details
Mass5.2±0.4[4] M☉
Radius3.3±0.5[4] R☉
Luminosity794[4] L☉
Surface gravity (log g)4.12±0.20[4] cgs
Temperature16,700±800[4] K
Rotational velocity (v sin i)14±8[4] km/s
Age24.1±7.5[7] Myr
Other designations
α Tel, CD−46° 12379, FK5 691, HD 169467, HIP 90422, HR 6897, SAO 229023[8]
Database references
SIMBADdata

Alpha Telescopii, Latinized from α Telescopii, is the brightest star in the southern constellation of Telescopium, with an apparent visual magnitude of 3.5.[2] The ancient Roman astronomer Ptolemy included it in the constellation Corona Australis, but it was moved to Telescopium when that constellation was created by French astronomer Nicolas Louis de Lacaille in the 18th century.[9] Parallax measurements put it at a distance of 278 light-years (85 parsecs) from Earth. At that range, the visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust.[6]

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