Delta Tauri

The Bayer designation Delta Tauri (δ Tau, δ Tauri) is shared by three star systems in the constellation Taurus. They are all members of the Hyades star cluster.

Because they are close to the ecliptic, these stars can be occulted by the Moon and, very rarely, by planets. The last occultation of δ¹ Tauri by a planet took place on 3 January 1818, when it was occulted by Venus.

Contents

δ¹ Tauri

δ¹ Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 22m 56.1s
Declination +17° 32' 33"
Apparent magnitude (V) +3.77
Distance 153 ± 7 ly
(47 ± 2 pc)
Spectral type K0-IIICN0.5
Other designations
Hyadum II, 61 Tauri, HR 1373,
HD 27697, BD+17 712,
FK5 162, HIP 20455, SAO 93897,
GC 5304, CCDM 04229+1733

δ¹ Tauri is a triple star approximately 153 light years from Earth and has the traditional name Hyadum II, which is Latin for "Second Hyad", and the name Eudora (Greek Ευδωρη), who was one of the Hyades sisters.

The primary component, Delta-1 Tauri A, is an orange K-type giant with an apparent magnitude of +3.77. Delta-1 has a luminosity of 74 times that of the Sun and a radius of 11.6 times solar. Its mass is calculated to be 2.6 solar masses. The surface temperature of this star is 4965 kelvins. Its companion, Delta-1 Tauri B, is a 12th magnitude star separated by 107 arcseconds from the primary. It is most likely not physically related to the main star. However, observations of lunar occultations of this star has revealed a much closer, physically related, star that orbits the main star in an eccentric orbit with an average distance of 1.76 AU. This companion takes about 530 days to orbit the main star.


δ² Tauri

δ² Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 24m 05.8s
Declination +17° 26' 38"
Apparent magnitude (V) +4.80
Distance 146 ± 6 ly
(45 ± 2 pc)
Spectral type A7V
Other designations
64 Tauri, HR 1380, HD 27819,
BD+17 714, HIP 20542,
SAO 93907, GC 5328,
CCDM 04240+1726

δ² Tauri is a white A-type main sequence dwarf with an apparent magnitude of +4.80. It is approximately 146 light years from Earth and is separated from δ¹ Tauri by 0.23° on the sky.


δ³ Tauri

δ³ Tauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 25m 29.4s
Declination +17° 55' 41"
Apparent magnitude (V) +4.30
Distance 148 ± 5 ly
(45 ± 2 pc)
Spectral type A2IV
Other designations
Kleeia, 68 Tauri, V776 Tauri,
HR 1389, HD 27962,
BD+17 719, HIP 20648,
SAO 93923, GC 5354,
ADS 3206,
CCDM 04255+1755

δ³ Tauri is a triple star system in the constellation Taurus. It is approximately 148 light years from Earth and is separated from δ¹ Tauri by 0.72° on the sky. This star also has the traditional name Cleeia or Kleeia (Greek Κλεεια), who was one of the Hyades sisters.

The primary component, δ³ Tauri A, is a white A-type subgiant with a mean apparent magnitude of +4.30. It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +4.29 to +4.32 with a period of 57.25 days. It has a close, 8th magnitude binary companion, δ³ Tauri B, 1.4 arcseconds, or at least 64 Astronomical Units, away. At 77 arcseconds away is the third component, the 11th magnitude δ³ Tauri C.

References

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Delta Tauri — Saltar a navegación, búsqueda Delta Tauri (δ Tau) puede referirse a tres estrellas distintas de la constelación de Tauro que forman parte del cúmulo abierto de las Híades: δ1 Tauri, también llamada Hyadum II o Eudora, sistema estelar de magnitud… …   Wikipedia Español

  • Delta-Scuti-Stern — Delta Scuti Sterne (auch als Zwergcepheiden[1] bezeichnet) sind pulsationsveränderliche Sterne der Spektralklassen A2 bis F6 und der Leuchtkraftklassen V bis III. Die Perioden liegen zwischen 0,03 und 0,2 Tagen und die Amplituden zwischen 0,003… …   Deutsch Wikipedia

  • Delta Scuti-Stern — Delta Scuti Sterne sind pulsationsveränderliche Sterne der Spektralklassen A2 bis F6 und der Leuchtkraftklassen V bis III. Die Perioden liegen zwischen 0,03 und 0,2 Tagen und die Amplituden zwischen 0,003 und 0,1 Größenklassen. [1] Die Pulsation… …   Deutsch Wikipedia

  • Delta Scuti variable — A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non radial pulsations of the star s surface. Typical brightness fluctuations are from 0.003 to 0.9… …   Wikipedia

  • Kappa Tauri — κ1 Tauri / κ2 Tauri Constelación Tauro Ascensión recta α κ1 04h 25min 22.2s κ2 04h 25min 25.0s Declinación δ κ1 +22º 17’ 38’’ κ2 …   Wikipedia Español

  • Theta2 Tauri — A/B Constelación Tauro Ascensión recta α 04h 28min 39,74s Declinación δ +15º 52’ 15,2’’ Distancia …   Wikipedia Español

  • Theta Tauri — Phaeo (θ¹ Tauri) Données d observation (Époque J2000.0) Ascension droite 04h 28m 34.5s Déclinaison +15° 57′ 44″ Constellation Taureau Magnitude apparente …   Wikipédia en Français

  • Eta Tauri — Pour les articles homonymes, voir Alcyone. Alcyone A (η Tauri) Données d observation (Époque J2000.0) Ascension droite 03h 47m 29,0765s Déc …   Wikipédia en Français

  • Theta Tauri — Starbox short name=θ¹ Tauri epoch=J2000.0 constell=Taurus ra=04h 28m 34.5s dec=+15° 57 44 spectral=K0IIIbFe 0.5 appmag v=+3.84 dist ly=153 ± 8 dist pc=47 ± 3 names=Phaeo, 77 Tauri, HR 1411, HD 28307, BD+15 631, HIP 20885, SAO 93955, GC 5433, BDS… …   Wikipedia

  • Variable de type T Tauri — Les variables de type T Tauri sont des étoiles variables, nommées d après l étoile prototype T Tauri. Elles sont toujours situées auprès des nuages moléculaires et caractérisées par des variations brusques et imprévisibles de leur magnitude… …   Wikipédia en Français


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.