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16 Cephei
Observation data; Epoch J2000 Equinox J2000
Constellation	Cepheus
Right ascension	21h 59m 14.96580s
Declination	+73° 10′ 47.6148″
Apparent magnitude (V)	5.036
Characteristics
Spectral type	F5V
B−V color index	0.41
Astrometry
Radial velocity (Rv)	−20.6±0.4 km/s
Proper motion (μ)	RA: −67.590 mas/yr ; Dec.: −159.571 mas/yr
Parallax (π)	27.4199 ± 0.1239 mas
Distance	118.9 ± 0.5 ly ; (36.5 ± 0.2 pc)
Absolute magnitude (MV)	2.17
Details
Mass	1.38 M☉
Radius	2.77 R☉
Luminosity	11 L☉
Surface gravity (log g)	3.87 cgs
Temperature	6,238 K
Metallicity	−0.36
Rotational velocity (v sin i)	26.4 km/s
Age	2 Gyr
Other designations
	16 Cep, BD+72° 1009, GC 30800, HD 209369, HIP 108535, HR 8400, SAO 10216
Database references
SIMBAD	data

16 Cephei is a single^[10] star located about 119 light years away from the Sun in the constellation of Cepheus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 5.036.^[2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.174 arc seconds per annum.^[11] It is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.^[5]

This is an ordinary F-type main-sequence star, somewhat hotter than the sun, with a stellar classification of F5 V.^[3] It is around two^[8] billion years old with a projected rotational velocity of 26.4 km/s.^[4] The star has 1.38^[7] times the mass of the Sun and 2.77^[1] times the Sun's radius. It is radiating 11^[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,238 K.^[4] The star is a source of X-ray emission.^[12]

There are several 11th and 12th magnitude stars within a few arc-minutes of 16 Cephei, all of them distant background objects.^[1] Only one of these is listed in the Washington Double Star Catalog and Catalog of Components of Double and Multiple Stars as a companion.^[13]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j 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.
^ ^a ^b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
^ ^a ^b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode:1962RGOB...51...79E.
^ ^a ^b ^c ^d ^e ^f Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377^{[permanent dead link‍]}
^ ^a ^b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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.
^ ^a ^b Griffin, R. F.; Suchkov, A. A. (2003). "The Nature of Overluminous F Stars Observed in a Radial-Velocity Survey". The Astrophysical Journal Supplement Series. 147 (1): 103–44. Bibcode:2003ApJS..147..103G. doi:10.1086/367855.
^ ^a ^b Ligi, R.; Creevey, O.; Mourard, D.; Crida, A.; Lagrange, A. -M.; Nardetto, N.; Perraut, K.; Schultheis, M.; Tallon-Bosc, I.; Ten Brummelaar, T. (2016). "Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters". Astronomy and Astrophysics. 586: A94. arXiv:1511.03197. Bibcode:2016A&A...586A..94L. doi:10.1051/0004-6361/201527054. S2CID 15941645.
^ ^a ^b Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.
^ "16 Cep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.