Lambda Herculis

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Lambda Herculis
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 30m 44.3098s[1]
Declination +26° 06′ 38.324″[1]
Apparent magnitude (V) 4.41[2]
Characteristics
Spectral type K3.5III[3]
U−B color index +1.68[4]
B−V color index +1.44[4]
Distance
393 ± 4 ly
(121 ± 1 pc)
Absolute magnitude (MV)−0.86[6]
Details
Gyr
HR 6526, SAO 249461[10]
Database references
SIMBADdata

Lambda Herculis (λ Herculis. abbreviated Lambda Her, λ Her), formally named Maasym /ˈmeɪəsɪm/,[11] is a star in the constellation of Hercules. From parallax measurements taken during the Gaia mission, it is approximately 393 light-years from the Sun.

Nomenclature

λ Herculis (Latinised to Lambda Herculis) is the star's Bayer designation.

It bore the traditional name Maasym, from the Arabic مِعْصَم miʽṣam "wrist". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[12] to catalogue and standardize proper names for stars. The WGSN approved the name Maasym for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[11]

In

27 Capricorni ("m Capricorni" in R.H.Allen version[16]) in Twelve States
(asterism).

Description

Lambda Herculis has an

red giant branch and fusing hydrogen in a shell or on the horizontal branch (red clump) and fusing helium in its core. As a horizontal-branch star it would be about seven billion years old, but as a red-giant-branch star it would only be about four billion years old.[8]

In 1783, English-German astronomer William Herschel described the solar apex, the point in sky towards which the Solar System is moving; using data from double stars, he identified this position as close to Lambda Herculis. Today it is known the solar apex is not so close to this star, however it is only 10° away from the position currently accepted (in Hercules, southwest of Vega).[17][18][19]

References

  1. ^
    doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  2. Bibcode:2002yCat.2237....0D
    .
  3. ^
    doi:10.1086/191373
    .
  4. ^
    Bibcode:1966CoLPL...4...99J
    .
  5. S2CID 17804304
    .
  6. S2CID 119257644
    .
  7. ^
    ISSN 0004-6361
    .
  8. ^
    S2CID 59334290
    .
  9. S2CID 54046583
    .
  10. Centre de Données astronomiques de Strasbourg
    . Retrieved 2010-07-03.
  11. ^ a b "Naming Stars". IAU.org. Retrieved 16 December 2017.
  12. ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
  13. ISBN 978-986-7332-25-7
    .
  14. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2011-01-30 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  15. ^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived 2008-09-24 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  16. ^ Star Names - R.H.Allen p.142
  17. ISBN 0-8153-0322-X
    .
  18. S2CID 186213288
    .
  19. ^ Kaler, Jim. "Furud". Retrieved 2017-04-26.
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