| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 03h 21m 13.6245s |
| Declination | +21° 08′ 49.51″ |
| Apparent magnitude (V) | 5.301 |
| Characteristics | |
| Spectral type | B5IV |
| U−B color index | -0.52 |
| B−V color index | -0.07 |
| Astrometry | |
| Radial velocity (Rv) | 13.9 km/s |
| Proper motion (μ) | RA: 21.68 mas/yr Dec.: -22.41 mas/yr |
| Parallax (π) | 7.06 ± 1.03 mas |
| Distance | approx. 460 ly (approx. 140 pc) |
| Absolute magnitude (MV) | 5.227 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 20,000 L☉ |
| Temperature | 10,000–30,000 K |
| Rotation | 20 Km/s 0,048579 Year |
| Orbit | |
| Companion | CCDM 03212+2109 B |
| Semimajor axis (a) | 0,7" |
| Inclination (i) | 230° |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Tau1 Arietis (τ1 Ari, τ1 Arietis) is a multiple star system in the constellation Aries. It is approximately 462 light years from Earth.
The primary component, τ¹ Arietis A, is an eclipsing binary which is classified as a blue-white B-type subgiant. The two components have apparent magnitudes of +5.4 and +7.9 and are separated by 0.15 arcseconds. At 0.67 arcseconds from A is τ¹ Arietis B, which has an apparent magnitude of +8.4. The combined mean apparent magnitude of the system is +5.27, but due to eclipsing of the binary components, the brightness varies from magnitude +5.26 to +5.32.
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