26 Cygni

26 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 01m 21.56485s[1]
Declination +50° 06′ 16.8912″[1]
Apparent magnitude (V) 5.12[2]
Characteristics
Evolutionary stage giant
Spectral type G8 III[3]
B−V color index 1.122[4]
Astrometry
Radial velocity (Rv)−0.25±0.16[1] km/s
Proper motion (μ) RA: +15.520[1] mas/yr
Dec.: +5.805[1] mas/yr
Parallax (π)7.2271 ± 0.0853 mas[1]
Distance451 ± 5 ly
(138 ± 2 pc)
Absolute magnitude (MV)−0.56[5]
Details
Mass2.44[6] M☉
Radius22.27[6] R☉
Luminosity204.8[6] L☉
Surface gravity (log g)2.50[4] cgs
Temperature4,700[4] K
Metallicity [Fe/H]−0.09±0.04[5] dex
Rotational velocity (v sin i)3.63[4] km/s
Other designations
e Cyg, 26 Cyg, BD+49°3158, HD 190147, HIP 98571, HR 7660, SAO 49098, ADS 13278, WDS J20014+5006, 2MASS J20012157+5006167[7]
Database references
SIMBADdata

26 Cygni is a single[8] star in the northern constellation of Cygnus. It has the Bayer designation e Cygni, while 26 Cygni is the Flamsteed designation. This star is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 5.12.[2] It is located around 451 light-years (138 pc) distant from the Sun,[1] based on parallax measurements. The radial velocity is close to negligible, being measured at −0.3 km/s.[1]

This object is an evolved giant star with a stellar classification of G8 III;[3] a star that has used up its core hydrogen and left the main sequence. It is most likely (88% chance) on the horizontal branch, in which case stellar modelling yields an estimated 2.44 times the mass of the Sun and 22 times the Sun's radius.[6] It is radiating 205[6] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,700 K.[4]

There is a magnitude 8.94 visual companion at an angular separation of 41.6″ along a position angle of 150°, as of 2014.[9]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference fernie1983 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference abt2008 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference hekker2007 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Stock2018 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).