15 Cygni

15 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 44m 16.60522s[1]
Declination +37° 21′ 15.6771″[1]
Apparent magnitude (V) 4.90[2]
Characteristics
Spectral type G8 III[2]
B−V color index 0.931[3]
Astrometry
Radial velocity (Rv)−23.62±0.21[4] km/s
Proper motion (μ) RA: +72.660[1] mas/yr
Dec.: +35.708[1] mas/yr
Parallax (π)11.0063 ± 0.1188 mas[1]
Distance296 ± 3 ly
(90.9 ± 1.0 pc)
Absolute magnitude (MV)0.19[5]
Details
Mass2.30[3] M☉
Radius12[4] R☉
Luminosity93.3[3] L☉
Surface gravity (log g)2.8[4] cgs
Temperature4,920±61[3] K
Metallicity [Fe/H]−0.14[4] dex
Rotational velocity (v sin i)2.8[4] km/s
Age1.50[3] Gyr
Other designations
15 Cyg, BD+37°3586, FK5 740, HD 186675, HIP 97118, HR 7517, SAO 68778[6]
Database references
SIMBADdata

15 Cygni is a single[7] star in the northern constellation Cygnus. With an apparent visual magnitude of 4.90,[2] it is a faint star but visible to the naked eye. The distance to 15 Cygni can be estimated from its annual parallax shift of 11.0 mas,[1] which yields a separation of some 296 light years. It is moving closer to the Sun with a heliocentric radial velocity of −23.6 km/s.[4]

This is an aging giant star with a stellar classification of G8 III,[2] having consumed the hydrogen at its core and evolved off the main sequence. It is a red clump giant,[8] which means it is generating energy via helium fusion at its core. The star is 1.50 billion years old with 2.3 times the mass of the Sun,[3] and has expanded to 12 times the Sun's radius.[4] It is radiating 93 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,920 K.[3]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Takeda2005 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).