Theta Tauri (θ Tau / θ Tauri) is a star system in the constellation Taurus and a member of the Hyades open cluster. It is approximately 155 light years from Earth. θ¹ Tauri has the tradiational name Phaeo, and θ² Tauri has the traditional name Phaesula, both of which were among the seven Hyades sisters. The system is dominated by two 3rd magnitude stars, θ¹ Tauri and θ² Tauri, which are separated by 5.62 arcminutes (0.094°) on the sky.
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- Theta Tauri (θ Tau / θ Tauri) is a star system in the constellation Taurus and a member of the Hyades open cluster. It is approximately 155 light years from Earth. θ¹ Tauri has the tradiational name Phaeo, and θ² Tauri has the traditional name Phaesula, both of which were among the seven Hyades sisters. The system is dominated by two 3rd magnitude stars, θ¹ Tauri and θ² Tauri, which are separated by 5.62 arcminutes (0.094°) on the sky. θ¹ Tauri is the dimmer component, an orange K-type giant with an apparent magnitude of +3.84. θ² Tauri is a white A-type giant with a mean apparent magnitude of +3.40. θ² Tauri is classified as a Delta Scuti type variable star and its brightness varies from magnitude +3.35 to +3.42 with a period of 1.82 hours. Both bright stars are spectroscopic binaries and have at least one closer companion. θ¹ Tauri has a 7th magnitude companion 0.082 arcseconds, or at least 4 Astronomical Units (AU), away from the primary. θ² has a 6th magnitude companion 0.005 arcseconds, or at least 2 AU, distant. It completes an orbit once ever 141 days.
- Theta Tauri (θ Tau / θ Tauri) est un système d'étoiles de la constellation du Taureau et un membre de l'amas ouvert des Hyades. Il est à environ 155 années-lumière de la Terre. θ¹ Tauri porte le nom traditionnel Phaeo, et θ² Tauri le nom traditionnel Phaesyla (grec Φαισυλα), tous deux désignant une des sept soeurs des Hyades. Le système est dominé par les deux étoiles de 3ème magnitude, θ¹ Tauri et θ² Tauri, qui sont séparées par 5,62 arcminutes (0,094°) sur le ciel. θ¹ Tauri est la composante la plus faible, une géante orange de type K avec une magnitude apparente de +3,84. θ² Tauri est une géante blanche de type A avec une magnitude apparente moyenne de +3,40. θ² Tauri est classée comme variable de type Delta Scuti et sa luminosité varie entre les magnitudes +3,35 et +3,42 sur une période de 1,82 heures. Les deux étoiles brillantes sont des binaires spectroscopiques qui ont au moins une compagne proche. θ¹ Tauri a une compagne de 7ème magnitude à 0,082 arcsecondes, soit à au moins 4 unités astronomiques (UA). θ² a une compagne de 6ème magnitude à 0,005 arcsecondes, soit à au moins 2 UA. Elle parcourt son orbite en 141 jours.
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- +15° 52' 15"
- +15° 57' 44"
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- Phaeo, 77 Tau, HR 1411,
HD 28307, BD+15 631, HIP 20885, SAO 93955, GC 5433, BDS 2212, CCDM 04286+1554
- Phaesula, 78 Tau, HR 1412,
HD 28319, BD+15 632, HIP 20894, SAO 93957, GC 5436, BDS 2212, CCDM 04286+1554
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- 04h 28m 39.7s
- 04h 28m 34.5s
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- Theta Tauri (θ Tau / θ Tauri) is a star system in the constellation Taurus and a member of the Hyades open cluster. It is approximately 155 light years from Earth. θ¹ Tauri has the tradiational name Phaeo, and θ² Tauri has the traditional name Phaesula, both of which were among the seven Hyades sisters. The system is dominated by two 3rd magnitude stars, θ¹ Tauri and θ² Tauri, which are separated by 5.62 arcminutes (0.094°) on the sky.
- Theta Tauri (θ Tau / θ Tauri) est un système d'étoiles de la constellation du Taureau et un membre de l'amas ouvert des Hyades. Il est à environ 155 années-lumière de la Terre. θ¹ Tauri porte le nom traditionnel Phaeo, et θ² Tauri le nom traditionnel Phaesyla (grec Φαισυλα), tous deux désignant une des sept soeurs des Hyades.
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