Eta Cygni

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Template:Short description

η Cygni
Template:Location mark
Location of η Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cygnus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.889[2]
Characteristics
Evolutionary stage red clump[3]
Spectral type K0 III[4]
U−B Template:Engvar +0.881[2]
B−V Template:Engvar +1.035[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[1] km/s
Proper motion (μ) RA: Script error: No such module "val". mas/yr[1]
Dec.: Script error: No such module "val". mas/yr[1]
Parallax (π)23.5482±0.1078 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.74[5]
Details
MassScript error: No such module "val".[6] Template:Solar mass
RadiusScript error: No such module "val".[6] Template:Solar radius
Luminosity60[6] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[6] cgs
TemperatureScript error: No such module "val".[7] K
Metallicity [Fe/H]−0.02[6] dex
Rotational velocity (v sin i)2.2 [8] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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Eta Cygni (η Cygni) is a star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent visual magnitude of 3.889.[2] The star lies along the main body of the constellation, about midway between Gamma Cygni and Albireo.[10] Based upon an annual parallax shift of 23.55 mas,[1] it is located 138.5 light years from the Sun.

This is an evolved red clump[3] giant star with a stellar classification of K0 III.[4] It is presently on the horizontal branch and is generating energy through the nuclear fusion of helium at its core. The star has about 0.9 times the mass of the Sun and has expanded to 10 It radiates 60 times the solar luminosity from its outer atmosphere at an effective temperature of 4,780 K.[6]

Eta Cygni has five visual companions,[11] of which only component B appears to be physically associated. This magnitude 12.0 star lies at an angular separation of 7.80 arc seconds along a position angle of 206°, as of 2007.[12]

References

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  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b c d e f Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

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External links

  • Script error: No such module "citation/CS1".

Template:Stars of Cygnus Template:Sky

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