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τ¹ Arietis
Observation data
Epoch J2000.0
Constellation Aries
Right ascension 03h21m13.6s
Declination +21°08′49″
Apparent magnitude (V) +5.27 <tr valign=top><td>Distance</td><td>462 ± 67 ly
(142 ± 21 pc)</td></tr><tr valign=top><td>Spectral type</td><td>B5IV</td></tr>
Other designations
61 Arietis, HR 1005, HD 20756, BD+20°543, FK5 1094, HIP 15627, SAO 75886, GC 4007, CCDM 03212+2109
Tau1 Arietis
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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