Kappa Cygni

κ Cygni
Location of κ Cygni (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 17m 06.16865s[1]
Declination +53° 22′ 06.4534″[1]
Apparent magnitude (V) 3.814[2]
Characteristics
Spectral type G9 III[3]
U−B color index +0.767[2]
B−V color index +0.965[2]
Astrometry
Radial velocity (Rv)−29.36±0.09[4] km/s
Proper motion (μ) RA: +60.07[1] mas/yr
Dec.: +122.83[1] mas/yr
Parallax (π)26.27 ± 0.10 mas[1]
Distance124.2 ± 0.5 ly
(38.1 ± 0.1 pc)
Absolute magnitude (MV)+0.84[4]
Details[4]
Mass2.35±0.12 M☉
Radius8.77±0.05[5] R☉
Luminosity46.8+5.7
−5.1 L☉
Surface gravity (log g)3.02±0.04 cgs
Temperature5,021±12 K
Metallicity [Fe/H]0.1 ± 0.02 dex
Rotational velocity (v sin i)1.08±0.28 km/s
Age813+164
−137 Myr
Other designations
κ Cyg, 1 Cygni, BD+53° 2216, FK5 726, HD 181276, HIP 94779, HR 7328, SAO 31537, Angie C.G (Star registration)
Database references
SIMBADdata

Kappa Cygni, Latinized from κ Cygni, is a star in the northern constellation of Cygnus. It has an apparent visual magnitude of 3.8,[2] which is bright enough to be seen with the naked eye. In the constellation, it forms the tip of Cygnus's left wing.[6] The radiant of the minor Kappa Cygnids meteor shower is located about 5° north of this star.[7]

Examination of this star's spectrum show it to match a stellar classification of G9 III,[3] with the 'III' luminosity class revealing that it has consumed the hydrogen fuel at its core and expanded into the giant star stage of its stellar evolution. It is known to vary in luminosity, but only by about 0.01 to 0.02 magnitudes.[8] Despite being younger than the Sun with an age of 800 million years,[4] it has reached its current evolutionary stage because more massive stars evolve faster. Kappa Cygni has expanded to 8.77 times the Sun's radius[5] and is glowing with 47 times the Sun's luminosity. The outer envelope has an effective temperature of 5,022 K,[4] giving it the yellow-orange hue of a star near the transition from a G- to a K-type classification.[9]

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  2. ^ a b c d Cite error: The named reference mnras172_667 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference araa11_29 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Deka-Szymankiewicz was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Baines2018 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference consolmagno_Davis2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference stegmuller1979 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference ba10_593 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).