Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 53m 17.37873s [1] |
Declination | +57° 31′ 24.4810″ [1] |
Apparent magnitude (V) | 5.14 [2] |
Characteristics | |
Spectral type | B5 V [3] |
U−B color index | +0.76 [2] |
B−V color index | −0.13 [2] |
Astrometry | |
Radial velocity (Rv) | −31.6±1.6 [4] km/s |
Proper motion (μ) |
RA: +5.768
[1]
mas/
yr Dec.: +11.483 [1] mas/ yr |
Parallax (π) | 5.9155 ± 0.1728 mas [1] |
Distance | 550 ± 20
ly (169 ± 5 pc) |
Absolute magnitude (MV) | −1.30 [5] |
Details [2] | |
Mass | 4.7+0.64 −0.53 [6] M☉ |
Radius | 4.30±0.45 R☉ |
Luminosity | 611.53 [5] L☉ |
Surface gravity (log g) | 3.82±0.08 cgs |
Temperature | 14,893±214 K |
Metallicity [Fe/H] | −0.17±0.16 dex |
Rotational velocity (v sin i) | 145 km/s |
Age | 26+32 −19 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
23 Cygni is a single, [2] blue-white hued star in the northern constellation Cygnus. It is a faint star, visible to the naked eye, with an apparent visual magnitude of 5.14. [2] The distance to this star, as estimated from its annual parallax shift of 5.9 mas, [1] is about 550 light years. It is moving closer to the Earth with a heliocentric radial velocity of −32 km/s, [4] and is expected to come as near as 166 light-years in around 5.6 million years. [2] At that distance, the current star would be of magnitude 2.24. [8]
This is an ordinary B-type main-sequence star of spectral type B5V, a star that is generating energy through hydrogen fusion at its core. It is roughly 26 [2] million years old with 4.7 [6] times the mass of the Sun and 4.3 times the Sun's radius. [2] The star has a high rate of spin, having a projected rotational velocity of 145 km/s. [2] It is radiating 612 [5] times the Sun's luminosity from its photosphere at an effective temperature of 14,893 K. [2]