Kappa Hydrae

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κ Hydrae
Observation data
ICRS
)
Constellation Hydra
Right ascension 09h 40m 18.36496s[1]
Declination −14° 19′ 56.2675″[1]
Apparent magnitude (V) 5.06[2]
Characteristics
Spectral type B4 IV/V[3]
U−B color index −0.57[2]
B−V color index −0.15[2]
Variable type Suspected[4][5]
Distance
440 ± 20 ly
(134 ± 5 pc)
Absolute magnitude (MV)−0.98[7]
Details
Myr
HIP 47452, HR 3849, SAO 155388.[12]
Database references
SIMBADdata

κ Hydrae, Latinised as Kappa Hydrae, is a solitary

mas.[1] It may be a variable star, meaning it undergoes repeated fluctuations in brightness by at least 0.1 magnitude.[5]

This is an

projected rotational velocity of 115.0 km/s,[11] and is only about 31 million years old.[3] The star radiates 328 times the solar luminosity from its outer atmosphere[9] at an effective temperature of 16,150 K.[10]

Name

This star was one of the set assigned by the 16th century astronomer Al Tizini[14] to Al Sharāsīf (ألشراسيف), the Ribs (of Hydra), which included the stars from β Crateris westward through κ Hydrae.[15][16]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Sharāsīf were the title for two stars : β Crateris as Al Sharasīf II and κ Hydrae as Al Sharasīf I.[17]

In

Extended Net, refers to an asterism consisting of Kappa Hydrae, Upsilon1 Hydrae, Lambda Hydrae, Mu Hydrae, HD 87344, and Phi1 Hydrae.[18] Consequently, Kappa Hydrae itself is known as 張宿五 (Zhāng Xiù wǔ), "the Fifth Star of Extended Net".[19]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1978A&AS...34....1N
    .
  3. ^
    S2CID 118629873
    .
  4. Bibcode:2009yCat....102025S
    .
  5. ^
    Bibcode:1982A&AS...48..503R
    .
  6. S2CID 59451347
    , A61.
  7. Bibcode:1991A&A...245..150Z
    .
  8. ^
    S2CID 425754
    .
  9. ^
    S2CID 118665352
    .
  10. ^
    S2CID 118362423
    .
  11. ^
    doi:10.1086/340590
    .
  12. ^ "kap Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-05.
  13. S2CID 14878976
    .
  14. ^ Rim Turkmani (7 July 2011). "Arabic Roots of the Scientific Revolution". Muslim Heritage. Retrieved 1 July 2016.
  15. ^ Star Names - R.H.Allen p. 182
  16. ^ Star Names - R.H.Allen p. 246
  17. ^ 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.
  18. ISBN 978-986-7332-25-7
    .
  19. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2008-10-25 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
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