23 Cygni
23 Cygni is a single, 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. The distance to this star, as estimated from its annual parallax shift of 5.9 mas, is about 550 light years. It is moving closer to the Earth with a heliocentric radial velocity of −32 km/s, and is expected to come as near as 166 light-years in around 5.6 million years. At that distance, the current star would be of magnitude 2.24.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 53m 17.37873s |
| Declination | +57° 31′ 24.4810″ |
| Apparent magnitude (V) | 5.14 |
| Characteristics | |
| Spectral type | B5 V |
| U−B color index | +0.76 |
| B−V color index | −0.13 |
| Astrometry | |
| Radial velocity (Rv) | −31.6±1.6 km/s |
| Proper motion (μ) | RA: +5.768 mas/yr Dec.: +11.483 mas/yr |
| Parallax (π) | 5.9155 ± 0.1728 mas |
| Distance | 550 ± 20 ly (169 ± 5 pc) |
| Absolute magnitude (MV) | −1.30 |
| Details | |
| Mass | 4.7+0.64 −0.53 M☉ |
| Radius | 4.30±0.45 R☉ |
| Luminosity | 611.53 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 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 million years old with 4.7 times the mass of the Sun and 4.3 times the Sun's radius. The star has a high rate of spin, having a projected rotational velocity of 145 km/s. It is radiating 612 times the Sun's luminosity from its photosphere at an effective temperature of 14,893 K.