Alpha Crateris

Alpha Crateris
Diagram showing star positions and boundaries of the Crater constellation and its surroundings


Location of α Crateris (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Crater
Right ascension 10h 59m 46.4647s[1]
Declination −18° 17′ 55.62″[1]
Apparent magnitude (V) 4.07[1]
Characteristics
Spectral type K1 III
Variable type None
Astrometry
Radial velocity (Rv)47.54 ± 0.16 km/s
Proper motion (μ) RA: −462.26 ± 0.24 mas/yr
Dec.: 129.49 ± 0.26 mas/yr
Parallax (π)20.49 ± 0.27 mas
Distance159 ± 2 ly
(48.8 ± 0.6 pc)
Details
Mass2.5[2] M☉
Radius6.5 R☉
Luminosity25[2] L☉
Surface gravity (log g)3.1[2] cgs
Temperature4,620[3] K
Other designations
7 Crt, NLTT 25942, LTT 4040, HD 95272, BD-17° 3273, HIP 53740, HR 4287, FK5 1283, SAO 156375.
Database references
SIMBADdata

Alpha Crateris (α Crateris, abbreviated Alpha Crt, α Crt), also named Alkes,[4] is a star in the constellation of Crater.

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 ألبجن awwil albajna), which was translated into Latin as Prima Crateris, meaning "the first cup".[5] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[6] 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 entered in the IAU Catalog of Star Names.[4]

In Chinese, 翼宿 (Yì Sù), 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.[7] Consequently, Alpha Crateris itself is known as 翼宿一 (Yì Sù yī, English: the First Star of Wings.).[8]

Namesake

USS Alkes (AK-110) was a United States Navy Crater class cargo ship named after the star.

Properties

Alpha Crateris belongs to the spectral class K1, has apparent magnitude 4.07, and is 174 light years from Earth.

References

  1. 1 2 3 "Alpha Crateris". SIMBAD Query. Retrieved 2009-09-14.
  2. 1 2 3 Edvardsson, B. (January 1988), "Spectroscopic surface gravities and chemical compositions for 8 nearby single sub-giants", Astronomy and Astrophysics, 190 (1-2): 148–166, Bibcode:1988A&A...190..148E
  3. ↑ Melo, C. H. F.; et al. (August 2005), "On the nature of lithium-rich giant stars. Constraints from beryllium abundances", Astronomy and Astrophysics, 439 (1): 227–235, arXiv:astro-ph/0504133Freely accessible, Bibcode:2005A&A...439..227M, doi:10.1051/0004-6361:20041805
  4. 1 2 "IAU Catalog of Star Names". Retrieved 28 July 2016.
  5. ↑ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society. 55: 429. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429.
  6. ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  7. ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  8. ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.

External links

Coordinates: 10h 59m 46.4647s, −18° 17′ 55.62″


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