23 Cygni
Star in the constellation Cygnus
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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]
| 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 | |
| 23 Cyg, BD+57°2084, HD 188665, HIP 97870, HR 7608, SAO 32085, WDS J19533+5731[7] | |
| 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[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]