Tau1 Arietis
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| Observation data Equinox J2000.0 |
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|---|---|
| Constellation | Aries |
| Right ascension | 03h21m13.6s |
| Declination | +21°08′49″ |
| Apparent magnitude (V) | +5.27 |
| Distance | 462 ± 67 ly (142 ± 21 pc) |
| Spectral type | B5IV |
| Other designations | |
- The correct title of this article is Tau1 Arietis. It features superscript or subscript characters that are substituted or omitted because of technical limitations.
- For other star systems with this Bayer designation, see Tau Arietis.
Tau¹ Arietis (τ¹ Ari / τ¹ Arietis) is a triple 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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