Delta Sagittarii

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Delta Sagittarii
Diagram showing star positions and boundaries of the Sagittarius constellation and its surroundings
Location of δ Sagittarii (circled)
Observation data
J2000.0
Constellation Sagittarius
Right ascension 18h 20m 59.64354s[1]
Declination −29° 49′ 41.1659″[1]
Apparent magnitude (V) +2.70[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.55[2]
B−V color index +1.38[2]
Distance
348 ± 7 ly
(107 ± 2 pc)
Absolute magnitude (MV)−1.99[5]
Details
δ Sgr A
Myr
PPM 268275, CCDM J18210-2950A, WDS J18210-2950A[9]
Database references
SIMBADDelta Sagittarii

Delta Sagittarii (δ Sagittarii, abbreviated Delta Sgr, δ Sgr), formally named Kaus Media

easily visible to the naked eye. Parallax measurements place the distance at roughly 348 light-years (107 parsecs) from the Sun.[1]

Properties

Eggleton and Tokovinin (2008) list Delta Sagittarii as a

mass of the Sun and is about 260 million years old.[6]

Delta Sagittarii has three dim visual companions:[14]

  • a 14th magnitude star at a separation of 26
    arcseconds
    ,
  • a 15th magnitude star at a separation of 40 arcseconds, and
  • a 13th magnitude star at a separation of 58 arcseconds from the primary.

Nomenclature

δ Sagittarii (Latinised to Delta Sagittarii) is the star's Bayer designation.

It bore the traditional names Kaus Media, Kaus Meridionalis, and Media, which derive from the

Working Group on Star Names (WGSN)[15] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[16]
included a table of the first two batches of names approved by the WGSN; which included Kaus Media for this star.

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Thani al Waridah, meaning 'second of Warida'.[17]

In

Chinese name for Delta Sagittarii itself is 箕宿二 Jī Sù èr ('the Second Star of Winnowing Basket').[18]

This star, together with Gamma Sagittarii, Epsilon Sagittarii,

Teapot asterism.[19]

In Hindu astrology, this star is also called Purvashada Nakshatra.

References

  1. ^
    doi:10.1051/0004-6361:20078357
    .
  2. ^
    Bibcode:1966CoLPL...4...99J
    .
  3. ^
    Bibcode:1982mcts.book.....H
    .
  4. Bibcode:1967IAUS...30...57E
    .
  5. Bibcode:1999A&A...343..222E
    .
  6. ^
    doi:10.1088/0004-6256/150/3/88
    .
  7. ^
    doi:10.1086/117741
    .
  8. ISSN 0004-6361
    .
  9. ^ "del Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-01-11.
  10. ISBN 1-931559-44-9
    .
  11. ^ "IAU Catalog of Star Names" (TXT). Archived from the original on 2016-08-12. Retrieved 28 July 2016.
  12. S2CID 14878976
    .
  13. Bibcode:1997A&A...319..881G
    .
  14. Bibcode:1994CoORB.115....1D
    .
  15. ^ "Division C WG Star Names". International Astronomical Union. Archived from the original on 2016-06-10. Retrieved 22 May 2016.
  16. ^ "Bulletin of the IAU Working Group on Star Names" (PDF). July 2016. Archived (PDF) from the original on 2016-09-09. Retrieved 28 July 2016.
  17. doi:10.1093/mnras/55.8.429
    .
  18. ^ 陳輝樺 (11 May 2006). "中國古代的星象系統 (11): 箕宿". AEEA 天文教育資訊網 [AEEA (Activities of Exhibition and Education in Astronomy)] (in Chinese). National Museum of Natural Science. Archived from the original on 2020-10-03.
  19. ^ "Teapot". Constellation Guide. 25 August 2015. Archived from the original on 2020-07-26. Retrieved 2017-05-13.
  1. ^ Radius calculated with temperature and luminosity

External links

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