Phi Sagittarii

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Phi Sagittarii
Location of φ Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 18h 45m 39.38610s[1]
Declination −26° 59′ 26.7944″[1]
Apparent magnitude (V) 3.17[2]
Characteristics
Spectral type B8.5 III[3]
U−B color index −0.36[4]
B−V color index −0.11[4]
Distance
239 ± 3 ly
(73 ± 1 pc)
Absolute magnitude (MV)−1.16[5]
Details
Myr
PPM 297231[8]
Database references
SIMBADdata

Phi Sagittarii,

apparent visual magnitude of 3.17,[2] it is the ninth-brightest star in the constellation and is readily visible to the naked eye. Parallax measurements place it at a distance of roughly 239 light-years (73 parsecs) from the Earth.[1] It is receding with a radial velocity of +21.5 km/s.[2]

The

luminosity class of III indicating it is a giant star evolved away from the main sequence after it has exhausted the hydrogen at its core. This energy is being radiated from the star's outer envelope at an effective temperature of 12487 K,[6] which produces the blue-white hue typical of B-type stars.[9]

This star has been catalogued as a

mas (1.3 au).[13]

Name and etymology

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Aoul al Sadirah, which was translated into Latin as Prima τού al Sadirah, meaning first returning ostrich.[14]

In

Chinese name for φ Sagittarii itself is 斗宿一 (Dǒu Xiù yī, English: the First Star of Dipper.)[15]

This star, together with

χ2 Sgr as Namalsadirah IV (except σ Sgr and ζ Sgr) .[18]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1999VeARI..35....1W
  3. ^
    Bibcode:1982mcts.book.....H
  4. ^
    Bibcode:1966CoLPL...4...99J
  5. S2CID 119257644
    .
  6. ^
    S2CID 33401607
    .
  7. ^ a b c Kaler, James B., "PHI SGR (Phi Sagittarii)", Stars, University of Illinois, retrieved 2012-01-15
  8. ^ "phi Sgr -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-15
  9. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
  10. ISSN 0004-637X
    .
  11. doi:10.1086/106589
  12. S2CID 14878976
  13. ISSN 2515-5172
    .
  14. doi:10.1093/mnras/55.8.429
    .
  15. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 11 日
  16. ^ Teapot, constellation-guide.com, retrieved 2017-05-13.
  17. ISBN 0-486-21079-0
    , retrieved 2012-09-04.
  18. ^ 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.{{citation}}: CS1 maint: location missing publisher (link)
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