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Location of ε Trianguli (circled) |
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 02m 57.95579s[1] |
| Declination | +33° 17′ 02.8813″[1] |
| Apparent magnitude (V) | +5.50[2] |
| Characteristics | |
| Spectral type | A2V |
| U−B color index | +0.06[2] |
| B−V color index | +0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | 3.3[3] km/s |
| Proper motion (μ) | RA: –15.97[1] mas/yr Dec.: –7.22[1] mas/yr |
| Parallax (π) | 8.33 ± 0.34[1] mas |
| Distance | 390 ± 20 ly (120 ± 5 pc) |
| Details | |
| Radius | 3.28[4] R☉ |
| Surface gravity (log g) | 3.76[5] |
| Temperature | 10,000[4] K |
| Rotational velocity (v sin i) | 107[6] km/s |
| Age | 6.0 × 108[4] years |
| Other designations | |
Epsilon Trianguli (ε Tri / ε Trianguli) is a binary star in the constellation Triangulum. Based upon measurement of it's trigonometric parallax, it is approximately 390 light years from Earth.[1]
The primary component is a main sequence star with a stellar classification of A2V, an apparent magnitude of +5.50 and an estimated age of 600 million years.[4] 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.[4] The secondary component has an apparent magnitude of 11.4 and is separated from the primary by an angle of 3.9 arcseconds.[8]
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.[4]
This star system is a probable member of the Ursa Major Moving Group of stars that share a common motion through space.[5] The space velocity components of Epsilon Trianguli are [U, V, W] = [+11.8, +11.4, –3.8] km/s.[9]
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