Mu Herculis

Coordinates: Sky map 17h 46m 27.52667s, +27° 43′ 14.4379″
Source: Wikipedia, the free encyclopedia.
Mu Herculis

Historical view of the Hercules constellation showing Mu Herculis (μ Her) as one of stars in the hero's elbow.
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
μ Her Aab (μ1 Her)
Right ascension 17h 46m 27.52667s[1]
Declination +27° 43′ 14.4379″[1]
Apparent magnitude (V) 3.417 ± 0.014[1]
μ Her BC (μ2 Her)
Right ascension 17h 46m 25.079s[2]
Declination +27° 43′ 01.45″[2]
Apparent magnitude (V) 10.2 / 10.7[3]
Characteristics
μ Her Aab
Spectral type G5IV[4] / M4V[5]
U−B color index +0.40[6]
B−V color index +0.76[6]
μ Her BC
Spectral type M3.5V[7]
U−B color index +1.00[6]
B−V color index +1.50[6]
Distance
27.21 ± 0.05 ly
(8.34 ± 0.01 pc)
Absolute magnitude (MV)+10.26[11]
Position (relative to μ Her Aab)[12]
Componentμ Her BC
″
Semi-amplitude
(K1)
(primary)		1.12 ± 0.10 km/s
Argument of periastron
(ω)
(secondary)		172.85 ± 0.64°
Details
μ Her Aa
Gyr
μ Her Ab
Mass0.32[5] M☉
μ Her B
dex
μ Her C
Mass0.39[13] M☉
HIP 86974.[15]
Database references
SIMBADμ Her Aab
μ Her BC

Mu Herculis (μ Herculis) is a nearby quadruple

spectrum of this star has served as one of the stable anchor points by which other stars are classified.[16] Its mass is about 1.1 times that of the Sun,[8]
and it is beginning to expand to become a giant.

Etymology

In the catalogue of stars in the Calendarium of Al Achsasi Al Mouakket, this star was designated Marfak Al Jathih Al Aisr, which was translated into Latin as Cubitum Sinistrum Ingeniculi, meaning the left elbow of kneeling man.[17]

In

Chinese name for μ Herculis itself is 天市左垣三 (Tiān Shì Zuǒ Yuán sān, English: the Third Star of Left Wall of Heavenly Market Enclosure), represent Jiuhe (九河, lit. meaning nine rivers), possibly for Jiujiang, the prefecture-level city in Jiangxi, China, which is the same literally meaning with Jiuhe.[19][20] From this Chinese title, the name Kew Ho appeared.[21]

Star system

Mu Herculis is a quadruple star system. The brightest star is a well-studied

spectral type of M4V and a mass of 0.32 M☉.[5]
This pair is also known as Mu1 Herculis.

The secondary component, also known as Mu2 Herculis,[12] consists of a pair of stars that orbit about each other with a period of about 43 years.[22] Mu Herculis A and the binary pair B-C are separated by some 35 arcseconds.[15] The stars B and C, which orbit each other, are separated from each other by 1.385 arcseconds, and have a slightly eccentric orbit, at 0.1796.[3]

See also

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:2003yCat.2246....0C
    .
  3. ^ a b c "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 23 March 2017.
  4. S2CID 119121800
  5. ^
    S2CID 43403927
    .
  6. ^
    Bibcode:1986EgUBV........0M
    .
  7. S2CID 53135130.[permanent dead link
    ]
  8. ^
    S2CID 119480210
    .
  9. ^
    S2CID 17350617
    .
  10. doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR
    .
  11. S2CID 9719725
    .
  12. ^ a b "* mu.02 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2017.
  13. ^ a b "Multiple Star Catalog". Archived from the original on 2018-12-03. Retrieved 2018-12-02.
  14. ^
    doi:10.1093/mnras/stu1313
    .
  15. ^ a b "* mu. Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2017.
  16. Bibcode:1993AAS...183.1710G, archived from the original
    on 2019-06-25, retrieved 2012-02-04
  17. doi:10.1093/mnras/55.8.429
  18. ISBN 978-986-7332-25-7
    .
  19. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日
  20. ^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived 2010-08-10 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  21. ^ Star Name - R.H. Allen p. 238
  22. doi:10.1086/321075

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Mu_Herculis&oldid=1186943790"