Beta Trianguli Australis

Beta Trianguli Australis
Location of β Trianguli Australis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe
Right ascension 15h 55m 08.56206s[1]
Declination −63° 25′ 50.6155″[1]
Apparent magnitude (V) 2.85[2]
Characteristics
Spectral type F1 V[3]
U−B color index +0.05[2]
B−V color index +0.29[2]
Astrometry
Radial velocity (Rv)+0.4[4] km/s
Proper motion (μ) RA: −188.66[1] mas/yr
Dec.: −401.85[1] mas/yr
Parallax (π)80.79 ± 0.16 mas[1]
Distance40.37 ± 0.08 ly
(12.38 ± 0.02 pc)
Absolute magnitude (MV)+2.37[5]
Details[6]
Mass1.56[7] M☉
Radius1.976±0.021 R☉
Luminosity9.30±0.17 L☉
Surface gravity (log g)4.219±0.066[8] cgs
Temperature7,171±35 K
Metallicity [Fe/H]−0.29±0.10 dex
Rotational velocity (v sin i)69.63 km/s
Age674[7] Myr
Other designations
β TrA, CD−63° 1135, FK5 589, GJ 601, HD 141891, HIP 77952, HR 5897, SAO 253346, LTT 6339[9]
Database references
SIMBADdata

Beta Trianguli Australis, Latinized from β Trianguli Australis, is a double star in the southern constellation of Triangulum Australe. It is approximately 40.37 light-years (12.38 parsecs) from Earth and has an apparent visual magnitude of +2.85.[2] This star has a relatively high rate of proper motion across the celestial sphere.[9] It is a F-type main-sequence star with a stellar classification of F1 V.[3] Beta TrA has a 14th magnitude optical companion at an angular separation of 155 arcseconds.

Observation with the Spitzer Space Telescope reveals what appears to be an excess infrared emission from this star. This suggests the presence of circumstellar material in this system, making it a debris disk candidate.[10] This star may be a member of the Beta Pictoris moving group, an association of about 17 stars that share a common origin and a similar motion through space. If it is a member of this group, this would put the age of β TrA at about 12 million years; the same as the group itself.[11]

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  2. ^ a b c d Cite error: The named reference aaass34_1 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj132_1_161 was invoked but never defined (see the help page).
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  7. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
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  9. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
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