Gamma Serpentis

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Gamma Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension 15h 56m 27.183s[1]
Declination +15° 39′ 41.82″[1]
Apparent magnitude (V) 3.85[2]
Spectral type F6 V[2]
U−B color index -0.03
B−V color index +0.48[2]
Variable type Suspected
Radial velocity (Rv) 7 km/s
Proper motion (μ) RA: 310.93 ± 0.20[1] mas/yr
Dec.: -1282.19 ± 0.18[1] mas/yr
Parallax (π) 88.86 ± 0.18[1] mas
Distance 36.70 ± 0.07 ly
(11.25 ± 0.02 pc)
Mass 1.30 ± 0.15[3] M
Radius 1.55 ± 0.05[3] R
Luminosity 3.02 ± 0.09[3] L
Surface gravity (log g) 4.23[2] cgs
Temperature 6,350 ± 310[2] K
Metallicity [Fe/H] −0.19[3] dex
Rotational velocity (v sin i) 10.2[3] km/s
Age Gyr
Other designations
Ainalhai, 41 Serpentis, HR 5933, BD +16°2849, HD 142860, LHS 408, GCTP 3604.00, SAO 101826, CCDM 15564+1540, FK5 591, HIP 78072.[4]

Gamma Serpentis (γ Serpentis, γ Ser) is a star in the constellation Serpens, in its head (Serpens Caput). It was a member of indigenous Arabic asterism al-Nasaq al-Sha'āmī, "the Northern Line" of al-Nasaqān "the Two Lines",[5] along with β Her (Kornephoros), γ Her (Hejian, Ho Keen) and β Ser (Chow).[6]

According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, al-Nasaq al-Sha'āmī or Nasak Shamiya were the title for three stars :β Ser as Nasak Shamiya I, γ Ser as Nasak Shamiya II, γ Her as Nasak Shamiya III (exclude β Her).[7] The star was later given the proper name Ainalhai, from the Arabic عين الحية ‘Ayn al-Ḥayyah "the Serpent's Eye".

In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of γ Serpentis, β Herculis, γ Herculis, κ Herculis, β Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.[8] Consequently, γ Serpentis itself is known as 天市右垣四 (Tiān Shì Yòu Yuán sì, English: the Fourth Star of Right Wall of Heavenly Market Enclosure), represent the state Zheng (鄭) (or Ching),[9][10][11] together with 20 Capricorni in Twelve States (asterism).


Gamma Serpentis is a yellow-white F-type main sequence dwarf with an apparent magnitude of +3.85. Occasionally Gamma Serpentis is listed as having two 10th magnitude companions, but it appears that these stars are just optical neighbours. The Gamma Serpentis system is approximately 36.7 light years from Earth.[1]


  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M 
  3. ^ a b c d e Bruntt, H. et al. (July 2010), "Accurate fundamental parameters for 23 bright solar-type stars", Monthly Notices of the Royal Astronomical Society 405 (3): 1907–1923, arXiv:1002.4268, Bibcode:2010MNRAS.405.1907B, doi:10.1111/j.1365-2966.2010.16575.x 
  4. ^ "HD 142860 -- Variable Star", SIMBAD Astronomical Database, retrieved 2007-01-23 
  5. ^ Kunitzsch, P., Smart, T., (2006), A Dictionary of Modern Star names: A Short Guide to 254 Star names and Their Derivations (Second Revised ed.), Cambridge, MA: Sky Publishing, p. 31, ISBN 1-931559-44-9 
  6. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p. 243, ISBN 0-486-21079-0, retrieved 2010-12-12 
  7. ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
  8. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  9. ^ Star Names - R.H.Allen p.376
  10. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 24 日
  11. ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.

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