Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 02m 57.95579s [1] |
Declination | +33° 17′ 02.8813″ [1] |
Apparent magnitude (V) | +5.50 [2] |
Characteristics | |
Spectral type | A2 V [3] |
U−B color index | +0.06 [2] |
B−V color index | +0.03 [2] |
Astrometry | |
Radial velocity (Rv) | 3.3 [4] km/s |
Proper motion (μ) |
RA: –15.97
[1]
mas/
yr Dec.: –7.22 [1] mas/ yr |
Parallax (π) | 8.33 ± 0.34 mas [1] |
Distance | 390 ± 20
ly (120 ± 5 pc) |
Absolute magnitude (MV) | +0.11 [5] |
Details | |
Mass | 2.75±0.05 [6] M☉ |
Radius | 3.28 [7] R☉ |
Luminosity | 93 [6] L☉ |
Surface gravity (log g) | 3.76 [8] cgs |
Temperature | 10,000 [7] K |
Rotational velocity (v sin i) | 107 [9] km/s |
Age | 600 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Trianguli, Latinized from ε Trianguli, is a binary star [11] system in the northern constellation of Triangulum. Based upon measurement of its trigonometric parallax, it is approximately 390 light years from Earth. [1]
The primary component is an A-type main sequence star with a stellar classification of A2 V, [3] an apparent magnitude of +5.50 and an estimated age of 600 million years. [7] It has 2.75 [6] times the mass of the Sun and is spinning with a projected rotational velocity of 107 km/s. [9] The radius of this star is more than three times the radius of the Sun, and the photosphere has an effective temperature of about 10,000. [7] The secondary component has an apparent magnitude of 11.4 and is separated from the primary by an angle of 3.9 arcseconds. [12]
An excess emission of infrared radiation suggests the presence of a dusty disk in orbit about the primary. This disk has a mean radius of 105 AU, or 105 times the separation of the Earth from the Sun, and is radiating at a temperature of 85 K. [7]
This star system is a probable member of the Ursa Major Moving Group of stars that share a common motion through space. [8] The space velocity components of Epsilon Trianguli are U, V, W = [+11.8, +11.4, –3.8] km/s. [13]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Triangulum |
Right ascension | 02h 02m 57.95579s [1] |
Declination | +33° 17′ 02.8813″ [1] |
Apparent magnitude (V) | +5.50 [2] |
Characteristics | |
Spectral type | A2 V [3] |
U−B color index | +0.06 [2] |
B−V color index | +0.03 [2] |
Astrometry | |
Radial velocity (Rv) | 3.3 [4] km/s |
Proper motion (μ) |
RA: –15.97
[1]
mas/
yr Dec.: –7.22 [1] mas/ yr |
Parallax (π) | 8.33 ± 0.34 mas [1] |
Distance | 390 ± 20
ly (120 ± 5 pc) |
Absolute magnitude (MV) | +0.11 [5] |
Details | |
Mass | 2.75±0.05 [6] M☉ |
Radius | 3.28 [7] R☉ |
Luminosity | 93 [6] L☉ |
Surface gravity (log g) | 3.76 [8] cgs |
Temperature | 10,000 [7] K |
Rotational velocity (v sin i) | 107 [9] km/s |
Age | 600 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Trianguli, Latinized from ε Trianguli, is a binary star [11] system in the northern constellation of Triangulum. Based upon measurement of its trigonometric parallax, it is approximately 390 light years from Earth. [1]
The primary component is an A-type main sequence star with a stellar classification of A2 V, [3] an apparent magnitude of +5.50 and an estimated age of 600 million years. [7] It has 2.75 [6] times the mass of the Sun and is spinning with a projected rotational velocity of 107 km/s. [9] The radius of this star is more than three times the radius of the Sun, and the photosphere has an effective temperature of about 10,000. [7] The secondary component has an apparent magnitude of 11.4 and is separated from the primary by an angle of 3.9 arcseconds. [12]
An excess emission of infrared radiation suggests the presence of a dusty disk in orbit about the primary. This disk has a mean radius of 105 AU, or 105 times the separation of the Earth from the Sun, and is radiating at a temperature of 85 K. [7]
This star system is a probable member of the Ursa Major Moving Group of stars that share a common motion through space. [8] The space velocity components of Epsilon Trianguli are U, V, W = [+11.8, +11.4, –3.8] km/s. [13]