Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 17m 18.86703s [1] |
Declination | +33° 50′ 49.8950″ [1] |
Apparent magnitude (V) | +4.01 [2] |
Characteristics | |
Spectral type | A1Vnn [3] |
U−B color index | +0.02 [2] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | +9.9 [4] km/s |
Proper motion (μ) |
RA: 44.64
[1]
mas/
yr Dec.: –52.57 [1] mas/ yr |
Parallax (π) | 29.04 ± 0.25 mas [1] |
Distance | 112.3 ± 1.0
ly (34.4 ± 0.3 pc) |
Absolute magnitude (MV) | +1.35 [5] |
Details | |
Mass | 2.7 [6] M☉ |
Radius | 1.96 [7] R☉ |
Luminosity | 33.0 [6] L☉ |
Temperature | 9,440 [8] K |
Rotational velocity (v sin i) | 254 [9] km/s |
Age | 300 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Trianguli (Gamma Tri, γ Trianguli, γ Tri) is a star in the constellation Triangulum located approximately 112 light years from Earth. It has an apparent magnitude of +4.01 and forms an optical (line-of-sight) triple with Delta Trianguli and 7 Trianguli. [11]
This star has a stellar classification of A1Vnn, [3] which indicates it is an A-type main sequence star. It has 2.7 [6] times the mass of the Sun and nearly double the Sun's radius. [7] Gamma Trianguli is radiating about 33 [6] times the luminosity of the Sun from its outer envelope at an effective temperature of 9,440 K, [8] giving the star a white hue. [12] The star is roughly 300 million years old. [6]
It is rotating rapidly, with a projected rotational velocity of 254 km/s along the equator, [9] which causes the star to take the pronounced shape of an oblate spheroid like Altair. [11] Because the inclination of the star's axial tilt is unknown, this means that the azimuthal equatorial velocity is at least this amount and possibly higher. [9] By comparison, the Sun is a slow rotator with an equatorial azimuthal velocity of 2 km/s. [13] The doppler shift from the rapid rotation results in very diffuse absorption lines in the star's spectrum, as indicated by the 'nn' in the classification. [14]
Orbiting the star is a dusty debris disk with a combined mass of about 2.9 × 10−2 times the mass of the Earth. This disk can be detected because it is being heated to a temperature of about 75 K by Gamma Trianguli and is radiating this as infrared energy. The disk is separated from the host star by an angle of 2.24 arcseconds, corresponding to a physical radius of 80 AU, or 80 times the separation of the Earth from the Sun. [7]
In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of γ Trianguli, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, and δ Trianguli. Consequently, the Chinese name for γ Trianguli itself is 天大將軍十 (Tiān Dà Jiāng Jūn shí, English: the Tenth Star of Heaven's Great General.). [15]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 17m 18.86703s [1] |
Declination | +33° 50′ 49.8950″ [1] |
Apparent magnitude (V) | +4.01 [2] |
Characteristics | |
Spectral type | A1Vnn [3] |
U−B color index | +0.02 [2] |
B−V color index | +0.02 [2] |
Astrometry | |
Radial velocity (Rv) | +9.9 [4] km/s |
Proper motion (μ) |
RA: 44.64
[1]
mas/
yr Dec.: –52.57 [1] mas/ yr |
Parallax (π) | 29.04 ± 0.25 mas [1] |
Distance | 112.3 ± 1.0
ly (34.4 ± 0.3 pc) |
Absolute magnitude (MV) | +1.35 [5] |
Details | |
Mass | 2.7 [6] M☉ |
Radius | 1.96 [7] R☉ |
Luminosity | 33.0 [6] L☉ |
Temperature | 9,440 [8] K |
Rotational velocity (v sin i) | 254 [9] km/s |
Age | 300 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Trianguli (Gamma Tri, γ Trianguli, γ Tri) is a star in the constellation Triangulum located approximately 112 light years from Earth. It has an apparent magnitude of +4.01 and forms an optical (line-of-sight) triple with Delta Trianguli and 7 Trianguli. [11]
This star has a stellar classification of A1Vnn, [3] which indicates it is an A-type main sequence star. It has 2.7 [6] times the mass of the Sun and nearly double the Sun's radius. [7] Gamma Trianguli is radiating about 33 [6] times the luminosity of the Sun from its outer envelope at an effective temperature of 9,440 K, [8] giving the star a white hue. [12] The star is roughly 300 million years old. [6]
It is rotating rapidly, with a projected rotational velocity of 254 km/s along the equator, [9] which causes the star to take the pronounced shape of an oblate spheroid like Altair. [11] Because the inclination of the star's axial tilt is unknown, this means that the azimuthal equatorial velocity is at least this amount and possibly higher. [9] By comparison, the Sun is a slow rotator with an equatorial azimuthal velocity of 2 km/s. [13] The doppler shift from the rapid rotation results in very diffuse absorption lines in the star's spectrum, as indicated by the 'nn' in the classification. [14]
Orbiting the star is a dusty debris disk with a combined mass of about 2.9 × 10−2 times the mass of the Earth. This disk can be detected because it is being heated to a temperature of about 75 K by Gamma Trianguli and is radiating this as infrared energy. The disk is separated from the host star by an angle of 2.24 arcseconds, corresponding to a physical radius of 80 AU, or 80 times the separation of the Earth from the Sun. [7]
In Chinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of γ Trianguli, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, and δ Trianguli. Consequently, the Chinese name for γ Trianguli itself is 天大將軍十 (Tiān Dà Jiāng Jūn shí, English: the Tenth Star of Heaven's Great General.). [15]