Eta Serpentis

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Template:Short description

Eta Serpentis
Template:Location mark
Location of η Serpentis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.260[2]
Characteristics
Spectral type K0 III-IV[3]
U−B Template:Engvar +0.643[2]
B−V Template:Engvar +0.940[2]
Astrometry
Radial velocity (Rv)+8.4[4] km/s
Proper motion (μ) RA: −547.75[1] mas/yr
Dec.: −701.42[1] mas/yr
Parallax (π)53.93±0.18 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.87[5]
Details
MassScript error: No such module "val".[6] Template:Solar mass
RadiusScript error: No such module "val".[7] Template:Solar radius
LuminosityScript error: No such module "val".[7] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[7] K
Metallicity [Fe/H]Script error: No such module "val".[9] dex
Rotational velocity (v sin i)Script error: No such module "val".[9] km/s
Age2.69[10] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Eta Serpentis, Latinized from η Serpentis, is a star in the constellation Serpens. In particular, it lies in Serpens Cauda, the snake's tail. The star has an apparent visual magnitude of 3.260,[2] making it visible to the naked eye. Parallax measurements give a distance estimate of Script error: No such module "convert". from the Earth.[1]

This star is larger than the Sun, with 1.6 times the mass[6] and almost six times the radius.[7][12] The spectrum matches a stellar classification of K0 III-IV,[3] with the luminosity class of III-IV corresponding to an evolved star that lies between the subgiant and giant stages. The expanded outer envelope star is radiating about 18 times the luminosity of the Sun at an effective temperature of Script error: No such module "val"..[7] At this temperature, it has an orange hue typical of a K-type star.[13] Eta Serpentis displays solar-like oscillations with a period of 0.09 of a day.[14]

Eta Serpentis was previously classified as a carbon star, which would have made it the brightest carbon star in the sky, although this classification was since found to be erroneous.[15]

Eta Serpentis is currently 1.6 light-years away from Gliese 710.Script error: No such module "Unsubst".

Name

In Chinese astronomy, the star is known as Script error: No such module "Lang". (Script error: No such module "Lang".), meaning 'Left Wall of Heavenly Market Enclosure'; the name refers to an asterism that represents eleven old states in China. The leftmost borderline of the enclosure consists of η Serpentis, δ Herculis, λ Herculis, μ Herculis, o Herculis, 112 Herculis, η Ophiuchi, ζ Aquilae, θ1 Serpentis, ν Ophiuchi and ξ Serpentis.[16] Consequently, the Chinese name for η Serpentis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., the Eighth Star of Left Wall of Heavenly Market Enclosure, representing the region of Donghai (東海, lit. meaning 'eastern sea').[17][18]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1".
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b c d e Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "Citation/CS1".
  16. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  17. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日 Script error: No such module "webarchive".
  18. ↑ Template:In lang English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Script error: No such module "webarchive"., Hong Kong Space Museum. Accessed on line November 23, 2010.

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Template:Stars of Serpens

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