Alpha Crateris
Template:Location mark Location of α Crateris (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crater |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.07[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K1 III[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −462.303[1] mas/yr Dec.: 128.614[1] mas/yr |
| Parallax (π) | 20.3693±0.1704 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.44[6] |
| Details | |
| Mass | 1.81[7] Template:Solar mass |
| Radius | 12.32[7] Template:Solar radius |
| Luminosity | 66.0[7] Template:Solar luminosity |
| Surface gravity (log g) | 2.53[7] cgs |
| Temperature | 4.691[7] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Age | 2.06[7] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 7 Crt, NLTT 25942, LTT 4040, HD 95272, BD−17°3273, HIP 53740, HR 4287, FK5 1283, SAO 156375 | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), officially named Alkes Template:IPAc-en,[8][9] is a star in the constellation of Crater. It is a cool giant star about Script error: No such module "convert". away.
Nomenclature
α Crateris (Latinised to Alpha Crateris) is the star's Bayer designation.
It bore the traditional name Alkes, from the Arabic الكاس alkās or الكأس alka's "the cup". In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Aoul al Batjna (أول ألباطیة awwal al-bāṭiya), which was translated into Latin as Prima Crateris, meaning "first [star] of the Cup".[10] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[11] to catalogue and standardize proper names for stars. The WGSN approved the name Alkes for this star 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 Wings (asterism), refers to an asterism consisting of Alpha Crateris, Gamma Crateris, Zeta Crateris, Lambda Crateris, Nu Hydrae, Eta Crateris, Delta Crateris, Iota Crateris, Kappa Crateris, Epsilon Crateris, HD 95808, HD 93833, Theta Crateris, HD 102574, HD 100219, Beta Crateris, HD 99922, HD 100307, HD 96819, Chi1 Hydrae, HD 102620 and HD 103462.[12] Consequently, Alpha Crateris itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[13]
Namesake
Script error: No such module "WPSHIPS utilities". was a United States Navy Script error: No such module "WPSHIPS utilities". named after the star.
Properties
Alpha Crateris is an orange giant of spectral type K1III. It has an apparent magnitude of 4.07, and is 174 light-years from Earth. It is thought to be a horizontal branch star, meaning it is fusing helium in its core after a helium flash. Cool horizontal branch stars are often called red clump giants as they form a noticeable grouping near the hot edge of the red giant branch in the H–R diagrams of clusters with near-solar metallicity. On this basis it is calculated to have a mass of Template:Solar mass, a luminosity of Template:Solar luminosity, and an age around two billion years. Its surface temperature is 4691 K. Or it might be a red-giant branch star, still fusing hydrogen in a shell around an inert helium core, in which case it would be slightly less massive, older, cooler, larger, and more luminous.[7]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c d e f g h Script error: No such module "Citation/CS1".
- ↑ George A. Davis (1944), 'The pronunciations, derivations, and meanings of a selected list of star names'. Popular Astronomy, Vol. 52, p.8–30
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ 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.
Script error: No such module "Check for unknown parameters".