Epsilon Aquarii

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Epsilon Aquarii
Location of ε Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 47m 40.55260s[1]
Declination −09° 29′ 44.7877″[1]
Apparent magnitude (V) 3.77[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type A1 V[2]
U−B color index +0.029[4]
B−V color index –0.001[4]
Variable type Constant[5]
Distance
208 ± 3 ly
(63.7 ± 0.9 pc)
Absolute magnitude (MV)−0.46[7]
Details
Myr
HR 7950, SAO 144810[10]
Database references
SIMBADdata

Epsilon Aquarii, Latinized from ε Aquarii, is a single[11] star in the equatorial zodiac constellation of Aquarius, located near the western constellation border with Capricornus. It has the proper name Albali /ælˈbeɪli/, now formally recognized by the IAU.[12][13] This is a white-hued star that is visible to the naked eye with an apparent visual magnitude of 3.77.[2] Based upon parallax measurements taken during the Hipparcos mission, it is located at a distance of approximately 208 light-years (64 pc) from the Sun[1] with an absolute magnitude of −0.46.[7] The star is drifting closer with a radial velocity of −15 km/s.[6]

This object is an

luminosity of the Sun from its photosphere at an effective temperature of 9,622 K.[9]

Nomenclature

ε Aquarii (Latinised to Epsilon Aquarii) is the star's Bayer designation.

It bore the traditional name, Albali, from the

Albulaan.) Along with Mu Aquarii (Albulaan) and Nu Aquarii (also Albulaan), they were al Bulaʽ (البلع), meaning "the Swallower".[14][15] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[16] to catalogue and standardize proper names for stars. The WGSN approved the name Albali for this star on 12 September 2016, and it is now so included in the List of IAU-approved Star Names.[13]

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, it was designated Nir Saad Bula (نير سعد ألبلع nayyir sa'd al bulaʽ), which was translated into Latin as Lucida Fortunæ Dissipantis, meaning "the brightest of luck of the swallower".[17]

In

Chinese name for Epsilon Aquarii itself is 女宿一 (Nǚ Sù yī, English: the First Star of Girl).[19]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    doi:10.1086/129336
    .
  3. ^
    S2CID 55586789
    .
  4. ^
    Bibcode:1984SAAOC...8...59C
    .
  5. ^
    doi:10.1051/0004-6361:20030620
    .
  6. ^
    S2CID 119231169
    .
  7. ^
    S2CID 53666672
    .
  8. ^
    S2CID 425754
    .
  9. ^
    S2CID 33401607
    .
  10. ^ "* eps Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-29.
  11. S2CID 14878976
    .
  12. ISBN 978-1-931559-44-7
    .
  13. ^ a b Naming Stars, IAU.org, retrieved 16 December 2017.
  14. Bibcode:1944PA.....52....8D
    .
  15. ISBN 0-486-21079-0
    , retrieved 2010-12-12.
  16. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  17. doi:10.1093/mnras/55.8.429
    .
  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 October 25, 2008, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.

External links

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