Beta Trianguli Australis

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Beta Trianguli Australis
Triangulum Australe IAU.svg
Red circle.svg
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]
Distance 40.37 ± 0.08  ly
(12.38 ± 0.02  pc)
Absolute magnitude  (MV)+2.37 [5]
Details [6]
Mass 1.56 [7]   M
Radius 1.976±0.021  R
Luminosity 9.30±0.17  L
Surface gravity (log g)4.219±0.066 [8]   cgs
Temperature 7,171±35  K
Metallicity [Fe/H]−0.29±0.10  dex
Rotational velocity (v sin i)69.63 km/s
Age 674 [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
SIMBAD data

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]

Modern legacy

β TrA appears on the flag of Brazil, symbolising the state of Santa Catarina. [12]

Related Research Articles

Beta<sup>2</sup> Sagittarii Star in the constellation Sagittarius

Beta² Sagittarii is a star in the zodiac constellation of Sagittarius. It is visible to the naked eye, having an apparent visual magnitude of +4.29. Based upon an annual parallax shift of 24.31 mas as seen from Earth, it is located 134 light-years from the Sun.

Chi<sup>1</sup> Sagittarii Star in the constellation Sagittarius

Chi1 Sagittarii (χ1 Sagittarii) is a binary star system in the zodiac constellation of Sagittarius. The pair have a combined apparent visual magnitude of +5.03, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.95 mas as seen from Earth, it is located around 252 light years from the Sun. It is advancing through space in the general direction of the Earth with a radial velocity of −43.4 km/s.

<span class="mw-page-title-main">Gamma Trianguli Australis</span> Star in the constellation Triangulum Australe

Gamma Trianguli Australis, Latinized from γ Trianguli Australis, is a single, white-hued star in the southern constellation of Triangulum Australe. Along with Alpha and Beta Trianguli Australis it forms a prominent triangular asterism that gives the constellation its name. It is the third-brightest member of this constellation with an apparent visual magnitude of +2.87. Based upon parallax measurements, Gamma Trianguli Australis is located at a distance of about 184 light-years from Earth.

<span class="mw-page-title-main">Iota Trianguli Australis</span> Variable star in the constellation Triangulum Australe

Iota Trianguli Australis is a binary star system in the constellation Triangulum Australe. It is visible to the naked eye with a combined apparent visual magnitude of +5.27. Based upon an annual parallax shift of 25.77 mas as seen from the Earth, it is located around 127 light years from the Sun. The system appears to be moving closer to the Sun with a radial velocity of around −6 km/s.

<span class="mw-page-title-main">Psi Velorum</span> Binary star in the constellation Vela

Psi Velorum, Latinized from ψ Velorum, is a binary star system in the southern constellation of Vela. Based upon an annual parallax shift of 53.15 mas as seen from Earth, it is located 61.4 light years from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of +3.58. The motion of this system through space makes it a candidate member of the Castor stellar kinematic group.

<span class="mw-page-title-main">Beta Caeli</span> Star in the constellation Caelum

Beta Caeli is the Bayer designation for a star in the southern constellation of Caelum. It is a dim star but visible to the naked eye, having an apparent visual magnitude of 5.04. Based upon an annual parallax shift of 4.88 mas as seen from Earth, it is located 94 light years from the Sun. The star is moving away from the Sun with a radial velocity of +28.8 km/s.

HD 42818 is a suspected astrometric binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye with an apparent visual magnitude of +4.76. Based upon an annual parallax shift of 18.64±0.23 mas as seen from Earth's orbit, it is located some 175 light years away. The system appears to be moving closer with a heliocentric radial velocity of −7 km/s. As of 2012, it is estimated that the system will make its closest approach to the Sun in 485,000 years at a distance of around 169.2 ly (51.87 pc).

I Carinae is a single, yellow-white hued star in the southern constellation Carina. It is a fourth magnitude star that is visible to the naked eye. An annual parallax shift of 61.64 mas provides a distance estimate of 62 light years. It is moving closer with a radial velocity of −5 km/s, and in an estimated 2.7 million years will pass within 24.3 ly (7.46 pc) of the Sun. In the next 7500 years, the south Celestial pole will pass close to this star and Omega Carinae.

<span class="mw-page-title-main">Tau Centauri</span> Star in the constellation Centaurus

Tau Centauri, Latinized from τ Centauri, is a solitary star in the southern constellation of Centaurus. It is visible to the naked eye with an apparent visual magnitude of +3.86. The distance to this star, based upon an annual parallax shift of 24.85 mas, is 131 light years. There is a 98% chance that it is a co-moving companion of Gamma Centauri; the two stars have an estimated separation of 1.7 ly (0.53 pc).

1 Centauri, or i Centauri, is a yellow-white-hued binary star system in the southern constellation Centaurus. It can be seen with the naked eye, having an apparent visual magnitude of +4.23. Based upon an annual parallax shift of 51.54 mas as seen from Earth's orbit, it is located 51.5 light-years from the Sun. The system is moving closer to the Sun with a radial velocity of −21.5 km/s.

<span class="mw-page-title-main">Epsilon Cephei</span> Star in the constellation Cepheus

Epsilon Cephei, Latinized from ε Cephei, is a star in the northern constellation of Cepheus. Based upon an annual parallax shift of 38.17 mas as seen from the Earth, it is located about 85 light years from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 4.18.

<span class="mw-page-title-main">Gamma Crateris</span> Star in the constellation Crater

Gamma Crateris is a binary star system, divisible with a small amateur telescope, and located at the center of the southern constellation of Crater. It is visible to the naked eye with an apparent visual magnitude of 4.06. With an annual parallax shift of 39.62 mas as seen from Earth, this star is located 82.3 light years from the Sun. Based upon the motion of this system through space, it is a potential member of the Castor Moving Group.

HD 16754 is a binary or triple-star system in the constellation Eridanus. It has the Bayer designation s Eridani; HD 16754 is the designation from the Henry Draper catalogue. The system is visible to the naked eye as a faint point of light with an apparent visual magnitude of +4.74. It is located at a distance of approximately 132 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +18 km/s. The system is a member of the Columba association of co-moving stars.

30 Monocerotis is a single star in the equatorial constellation of Hydra, located 122 light years away from the Sun. It has the Bayer designation C Hydrae; 30 Monocerotis is the Flamsteed designation and was assigned when it belonged to the Monoceros constellation. The object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 3.90. It is moving away from the Earth with a heliocentric radial velocity of +10 km/s.

59 Leonis, or c Leonis, is a single white-hued star in the southern part of the constellation of Leo. It is north of 58 Leonis, south of Chi Leonis, and well east of the bright star Regulus. Its apparent visual magnitude is 4.98, so it is dimly visible to the naked eye, 0.21 degree south of the ecliptic. The annual parallax shift as seen from Earth's orbit is 21.57±0.26 mas, giving a distance estimate of about 151 light years. The star is moving closer to the Sun with a heliocentric radial velocity of −12 km/s.

<span class="mw-page-title-main">Beta Pavonis</span> Star in the constellation Pavo

Beta Pavonis, Latinised from β Pavonis, is a single, white-hued star in the southern constellation of Pavo. It can be seen with the naked eye, having an apparent visual magnitude of 3.42. Based upon an annual parallax shift of 24.14 mas as seen from Earth, it is located 135 light-years from the Sun. It is moving away from the Sun with a radial velocity of +4 km/s. Beta Pavonis is a member of the Ursa Major Moving Group, a set of stars that share a similar motion through space.

<span class="mw-page-title-main">QW Puppis</span> F3V star in the constellation Puppis

QW Puppis is a class F3V star in the constellation Puppis. Its apparent magnitude is 4.49 and it is approximately 69.9 light years away based on parallax.

78 Ursae Majoris is a binary star system in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.93. Parallax estimates by Hipparcos put it at a distance of 83 light-years (25 pc), but it is drifting closer with a radial velocity of −5 km/s. The system is a candidate member of the Ursa Major Moving Group.

Sigma2 Gruis is a binary star system in the southern constellation of Grus. Its apparent visual magnitude is 5.86. The pair had an angular separation of 2.7 arc seconds along a position angle of 265°, as of 1991. Located around 215 ly (66 pc) distant, the white-hued primary component is an A-type main-sequence star of spectral type A1V, a star that is currently fusing its core hydrogen.

<span class="mw-page-title-main">7 Trianguli</span> Star in the constellation Triangulum

7 Trianguli is a solitary star located in the northern constellation Triangulum. It has an apparent magnitude of 5.25, making it faintly visible to the naked eye under ideal conditions. The star is situated at distance of 360 light years but is approaching with a heliocentric radial velocity of −1.3 km/s, which is poorly constrained.

References

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