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] |
Distance | 296 ± 3
ly (90.9 ± 1.0 pc) |
Absolute magnitude (MV) | 0.19 [5] |
Details | |
Mass | 2.30 [3] M☉ |
Radius | 12 [4] R☉ |
Luminosity | 93.3 [3] L☉ |
Surface gravity (log g) | 2.8 [4] cgs |
Temperature | 4,920±61 [3] K |
Metallicity [Fe/H] | −0.14 [4] dex |
Rotational velocity (v sin i) | 2.8 [4] km/s |
Age | 1.50 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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]