Kappa Tauri
| Observation data J2000.0 Equinox
| |
|---|---|
| Constellation | Taurus |
| κ1 Tau | |
| Right ascension | 04h 25m 22.16505s[1] |
| Declination | +22° 17′ 37.9375″[1] |
| Apparent magnitude (V) | +4.22[2] |
| κ2 Tau | |
| Right ascension | 04h 25m 25.01518s[1] |
| Declination | +22° 11′ 59.9876″[1] |
| Apparent magnitude (V) | +5.24[2] |
| Characteristics | |
| κ1 Tau | |
| Spectral type | A7IV-V[3] |
| U−B color index | +0.12[2] |
| B−V color index | +0.14[2] |
| κ2 Tau | |
| Spectral type | A7V |
| U−B color index | +0.09[2] |
| B−V color index | +0.17[2] |
| Absolute magnitude (MV) | +2.18[5] |
| Details | |
| κ1 Tau | |
Rotational velocity (v sin i) | 191[9] km/s |
| κ2 Tau: 67 Tauri, BD+21 643, HD 27946, HIP 20641, HR 1388, SAO 76602.[11] | |
| Database references | |
| SIMBAD | κ1 Tau |
| κ2 Tau | |
Kappa Tauri (κ Tau, κ Tauri) is a
light years from Earth
and are separated from each other by about six light years.
System
Hyades
with κ Tauri as the very close pair at lower centre (north is approximately to the left)The system is dominated by a visual
A-type main sequence star with an apparent magnitude of +5.24.[2]
Between the two bright stars is a
arcseconds from each other (as of 2013) and 175.1 arcseconds from κ1 Tau. Two more 12th magnitude companions fill out the visual group: Kappa Tauri E, which is 145 arcseconds from κ1 Tau, and Kappa Tauri F, 108.5 arcseconds away from κ2 Tau.[12]
The bright pair are both members of the
Hyades star cluster, while the fainter stars are all much more distant background stars.[13]
Test of General Relativity
Kappa Tauri was photographed during the solar eclipse of May 29, 1919 by the expedition of Arthur Eddington in Príncipe and others in Sobral, Brazil that confirmed Albert Einstein's prediction of the bending of light around the Sun from his general theory of relativity which he published in 1915.[14]
Naming
- With φ, υ 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, these stars (κ2 and κ1) are Alkalbain III and Alkalbain IV, and υ as Alkalbain V.[16]
- In Chinese, 天街 (Tiān Jiē), meaning Celestial Street, refers to an asterism consisting of κ1 Tauri and ω Tauri. Consequently, κ1 Tauri itself is known as 天街一 (Tiān Jiē yī, English: the First Star Star of Celestial Street.).[17]
References
- ^ S2CID 18759600.
- ^ Bibcode:1986EgUBV........0M.
- doi:10.1086/110819
- S2CID 119231169.
- ^ doi:10.1086/300413.
- S2CID 119323941.
- ^ S2CID 11879505.
- ^ S2CID 118665352.
- ^ S2CID 18475298.
- ^ "* kap01 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-05.
- ^ "* kap02 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-11-05.
- doi:10.1086/323920, retrieved 2015-11-08
- doi:10.1086/112607
- .
- Allen, Richard Hinckley(1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 413
- ^ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars (PDF), Jet Propulsion Laboratory, California Institute of Technology.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 23 日
