Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Taurus |
Right ascension | 04h 26m 18.46368s [1] |
Declination | +22° 48′ 48.8885″ [1] |
Apparent magnitude (V) | 4.28 – 4.31 [2] |
Characteristics | |
Spectral type | A8 Vn [3] |
U−B color index | +0.14 [4] |
B−V color index | +0.25 [4] |
Variable type | δ Scuti [2] |
Astrometry | |
Radial velocity (Rv) | 32.2±1.1 [5] km/s |
Proper motion (μ) |
RA: +108.81
[1]
mas/
yr Dec.: −46.80 [1] mas/ yr |
Parallax (π) | 21.21 ± 0.25 mas [1] |
Distance | 154 ± 2
ly (47.1 ± 0.6 pc) |
Absolute magnitude (MV) | +0.91 [6] |
Details | |
Mass | 1.55 [7] M☉ |
Radius | 1.803 [8] R☉ |
Luminosity | 32.5 [9] L☉ |
Surface gravity (log g) | 3.50 [7] cgs |
Temperature | 7,398±252 [7] K |
Rotation | 0.415 d [8] |
Rotational velocity (v sin i) | 243 [3] km/s |
Age | 827 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Upsilon Tauri (υ Tauri) is a solitary, [11] white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster. [8] It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.
This is an A-type main sequence star with a stellar classification of A8 Vn. [3] It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours. [2] At an estimated age of 827 million years, [7] it is spinning rapidly with a rotation period of just 0.415 days. [8] This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius. [13]
Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky. [14]
With φ, κ1, κ2 and χ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs. [15] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars : φ as Alkalbain I, χ as Alkalbain II, κ1 as Alkalbain III, κ2 as Alkalbain IV and this star (υ) as Alkalbain V. [16]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Taurus |
Right ascension | 04h 26m 18.46368s [1] |
Declination | +22° 48′ 48.8885″ [1] |
Apparent magnitude (V) | 4.28 – 4.31 [2] |
Characteristics | |
Spectral type | A8 Vn [3] |
U−B color index | +0.14 [4] |
B−V color index | +0.25 [4] |
Variable type | δ Scuti [2] |
Astrometry | |
Radial velocity (Rv) | 32.2±1.1 [5] km/s |
Proper motion (μ) |
RA: +108.81
[1]
mas/
yr Dec.: −46.80 [1] mas/ yr |
Parallax (π) | 21.21 ± 0.25 mas [1] |
Distance | 154 ± 2
ly (47.1 ± 0.6 pc) |
Absolute magnitude (MV) | +0.91 [6] |
Details | |
Mass | 1.55 [7] M☉ |
Radius | 1.803 [8] R☉ |
Luminosity | 32.5 [9] L☉ |
Surface gravity (log g) | 3.50 [7] cgs |
Temperature | 7,398±252 [7] K |
Rotation | 0.415 d [8] |
Rotational velocity (v sin i) | 243 [3] km/s |
Age | 827 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Upsilon Tauri (υ Tauri) is a solitary, [11] white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster. [8] It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.
This is an A-type main sequence star with a stellar classification of A8 Vn. [3] It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours. [2] At an estimated age of 827 million years, [7] it is spinning rapidly with a rotation period of just 0.415 days. [8] This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius. [13]
Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky. [14]
With φ, κ1, κ2 and χ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs. [15] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars : φ as Alkalbain I, χ as Alkalbain II, κ1 as Alkalbain III, κ2 as Alkalbain IV and this star (υ) as Alkalbain V. [16]