23 Cygni

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]

23 Cygni
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[1] mas
Distance550 ± 20 ly
(169 ± 5 pc)
Absolute magnitude (MV)−1.30[5]
Details[2]
Mass4.7+0.64
−0.53[6] M☉
Radius4.30±0.45 R☉
Luminosity611.53[5] L☉
Surface gravity (log g)3.82±0.08 cgs
Temperature14,893±214 K
Metallicity [Fe/H]−0.17±0.16 dex
Rotational velocity (v sin i)145 km/s
Age26+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
SIMBADdata

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]

References
  1. 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.
  2. 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.
  3. 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: 691–702, Bibcode:1977MNRAS.180..691H, doi:10.1093/mnras/180.4.691.
  4. Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  5. 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.
  6. 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, 40.
  7. "23 Cyg". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-09.
  8. 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
    Ref.: Dopita, Michael A.; Sutherland, Ralph S. (2004), Astrophysics of the Diffuse Universe, Astronomy and Astrophysics Library, Springer Science & Business Media, p. 296, ISBN 3540433627
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