| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19 53 17.37873 |
| 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 | −0.17±0.16 dex |
| Rotational velocity (v sin i) | 145 km/s |
| Age | 26+32 −19 Myr |
| Other designations | |
| 23 Cyg, BD+57°2084, HD 188665, HIP 97870, HR 7608, SAO 32085, WDS J19533+5731 | |
| Database references | |
| SIMBAD | data |
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.
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.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018.
- Hill, P. W.; Lynas-Gray, A. E. (September 1977), "UBV photometry and MK spectral classification of northern early-type stars at intermediate galactic latitudes.", Monthly Notices of the Royal Astronomical Society, 180 (4): 691–702, Bibcode:1977MNRAS.180..691H, doi:10.1093/mnras/180.4.691.
- ^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 13, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065, 40.
- "23 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-09.
- At a distance (D) of 50.99 and an absolute magnitude (M) of −1.30, ignoring extinction (A), the apparent magnitude (m) would be:
- m = M + A + 5·log D + 5 ≈ −1.30 + 5·log 50.99 − 5 = 2.24