Gamma Aquarii

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Gamma Aquarii
Location of γ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 21m 39.37542s[1]
Declination –01° 23′ 14.4031″[1]
Apparent magnitude (V) 3.849[2]
Characteristics
Spectral type A0 V[3]
U−B color index –0.092[2]
B−V color index –0.060[2]
Distance
164 ± 9 ly
(50 ± 3 pc)
Absolute magnitude (MV)+0.10[5]
Details
Myr
HR 8518, SAO 146044, ADS 15864, WDS J22217-0123A[9]
Database references
SIMBADdata

Gamma Aquarii, or γ Aquarii, is a suspected binary star system in the constellation of Aquarius. It has an apparent visual magnitude of 3.849,[2] making it one of the brighter members of the constellation. Based upon parallax measurements taken during the Hipparcos mission, this star is located at a distance of approximately 164 light-years (50 parsecs) from the Sun.[1] It is drifting closer to the Sun with a radial velocity of −16 km/s.[4] In 1998, Olin J. Eggen included this star as a candidate member of the Hyades Supercluster.[5]

Gamma Aquarii is the primary or 'A' component of a double star designated WDS J22217-0123.[10] The secondary or 'B' component is UCAC2 31430071.[11] Gamma Aquarii A's two purported components are therefore designated WDS J22217-0123 Aa and Ab. Gamma Aquarii is traditionally also called Sadachbia /səˈdækbiə/,[12] a name now formally restricted to γ Aqr Aa.[13]

Nomenclature

γ Aquarii, Latinised to Gamma Aquarii, is the system's Bayer designation. WDS J22217-0123 A is its designation in the Washington Double Star Catalog.

It bore the traditional name Sadachbia, from an Arabic expression سعد الأخبية (sa‘d al-’axbiyah), meaning "luck of the homes (tents)". In Hindi it is also called Satabhishaj (a hundred physicians); it is called Sadhayam in Tamil. In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Aoul al Achbiya (أول ألأجبية - awwil al ahbiyah), which was translated into Latin as Prima Tabernaculorum, meaning the first of luck of the homes (tents).[14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN approved the name Sadachbia for the component WDS J22217-0123 Aa on 21 August 2016, and it is now so included in the List of IAU-approved Star Names.[13]

This star, along with Pi Aquarii (Seat), Zeta Aquarii (Sadaltager / Achr al Achbiya) and Eta Aquarii (Hydria), were al Aḣbiyah الأخبية "the Tent".[16][17][18]

In

Chinese name for Gamma Aquarii itself is 墳墓二 (Fén Mù èr, English: the Second Star of Tomb).[20]

Properties

In 1978 through 1984,

speckle interferometry,[21][22] and it is listed as such in the 1991 revision of the Bright Star Catalogue.[23] In 2008, P. P. Eggleton and A. A. Tokovinin listed it as a single star in their catalogue of multiplicity.[24]

It presents as an

A-type star.[27]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1984SAAOC...8...59C
    .
  3. ^
    doi:10.1086/110819
    .
  4. ^
    S2CID 119231169
    .
  5. ^
    doi:10.1086/300413
    .
  6. ^
    S2CID 33401607. Vizier catalog entry
  7. ^
    doi:10.1086/149890
    .
  8. ^
    S2CID 18475298
    .
  9. ^ "gam Aqr". SIMBAD. Centre de données astronomiques de Strasbourg.{{cite web}}: CS1 maint: postscript (link)
  10. ^ "Washington Double Star Catalog". United States Naval Observatory. Archived from the original on 14 February 2011. Retrieved 26 February 2018.
  11. ^ "UCAC2 31430071". SIMBAD. Centre de données astronomiques de Strasbourg.{{cite web}}: CS1 maint: postscript (link)
  12. ISBN 978-1-931559-44-7
    .
  13. ^ a b "Naming Stars". IAU.org. Retrieved 26 February 2018.
  14. doi:10.1093/mnras/55.8.429
    .
  15. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  16. Bibcode:1944PA.....52....8D
  17. ISBN 0-486-21079-0
    , retrieved 2010-12-12.
  18. Hebrew
    )
  19. ISBN 978-986-7332-25-7
    .
  20. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived August 18, 2010, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  21. doi:10.1086/130327
    .
  22. S2CID 122218502
    .
  23. Bibcode:1964cbs..book.....H
    .
  24. S2CID 14878976
    .
  25. doi:10.1093/mnras/269.1.209
    .
  26. doi:10.3847/1538-3881/153/1/39
    , 39.
  27. Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original
    on 2012-03-18, retrieved 2012-01-16.

External links
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