Kappa Aquarii
Template:Location mark Location of κ Aquarii (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.030±0.009[3] |
| Characteristics | |
| Spectral type | K1.5 IIIb CN0.5[4] |
| U−B Template:Engvar | +1.16[5] |
| B−V Template:Engvar | +1.142[6] |
| Astrometry | |
| Radial velocity (Rv) | +7.31±0.16[6] km/s |
| Proper motion (μ) | RA: −69.411 mas/yr[2] Dec.: −119.631 mas/yr[2] |
| Parallax (π) | 14.7149±0.0995 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.96[1] |
| Details | |
| Mass | 2.554±0.128[7] Template:Solar mass |
| Radius | 13[6] Template:Solar radius |
| Luminosity | 60[6] Template:Solar luminosity |
| Surface gravity (log g) | 2.63±0.08[3] cgs |
| Temperature | 4,581±5[6] K |
| Metallicity [Fe/H] | +0.14±0.04[3] dex |
| Rotational velocity (v sin i) | 3.8[6] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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Kappa Aquarii is a candidate binary star in the equatorial constellation of Aquarius. Its identifier is a Bayer designation that is Latinized from κ Aquarii, and abbreviated Kappa Aqr or κ Aqr, respectively. This system is visible to the naked eye, but it is faint at an apparent visual magnitude of 5.03.[3] Based upon parallax measurements, it is around Template:Convert from the Sun.[5] The system is drifting further away from the Sun with a radial velocity of +7.3 km/s.[6]
The two components are designated Kappa Aquarii A and B. The former is named Situla, pronouced Template:IPAc-en, the traditional name for the system.[9]
Nomenclature
κ Aquarii (Latinised to Kappa Aquarii) is the system's Bayer designation. The designations of the two components as Kappa Aquarii A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[10]
It bore the traditional name Situla, a Latin word meaning "bucket" or "water jar".[11] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[12] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[13] It approved the name Situla for the component Kappa Aquarii A on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[9]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Temple, refers to an asterism consisting of Kappa Aquarii, 44 Aquarii, 51 Aquarii and HD 216718.[14] Consequently, the Chinese name for Kappa Aquarii itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[15] From this Chinese name, the name Heu Leang has appeared, meaning "the empty bridge".[11]
Properties
Kappa Aquarii is most probably a wide binary star system.[16] The brighter component is a giant star with a stellar classification of K1.5 IIIb CN0.5.[4] It has exhausted the supply of hydrogen at its core and has expanded to 13[6] times the radius of the Sun. It is radiating 60[6] times the Sun's luminosity from its photosphere at an effective temperature of Template:Val,[6] giving it the orange-hued glow of a K-type star.[17]
The fainter companion star is located at an angular separation of 98.3 arcseconds and has an apparent magnitude of 8.8.[17]
In culture
Endymion, an 1818 poem by John Keats, describes the star in its form as a water urn thus: Template:Quote
USS Situla (AK-140) was a United States Navy Crater-class cargo ship named after the star.
References
External links
- ↑ a b Cite error: Invalid
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- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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