16 Cephei

16 Cephei
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 59m 14.96580s[1]
Declination +73° 10′ 47.6148″[1]
Apparent magnitude (V) 5.036[2]
Characteristics
Spectral type F5V[3]
B−V color index 0.41[4]
Astrometry
Radial velocity (Rv)−20.6±0.4[5] km/s
Proper motion (μ) RA: −67.590[1] mas/yr
Dec.: −159.571[1] mas/yr
Parallax (π)27.4199 ± 0.1239 mas[1]
Distance118.9 ± 0.5 ly
(36.5 ± 0.2 pc)
Absolute magnitude (MV)2.17[6]
Details
Mass1.38[7] M☉
Radius2.77[1] R☉
Luminosity11[1] L☉
Surface gravity (log g)3.87[4] cgs
Temperature6,238[4] K
Metallicity−0.36[6]
Rotational velocity (v sin i)26.4[4] km/s
Age2[8] Gyr
Other designations
16 Cep, BD+72° 1009, GC 30800, HD 209369, HIP 108535, HR 8400, SAO 10216[9]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h i j Cite error: The named reference dr216cep was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Høg2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference rob51 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference griffin2003 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference ligi was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference casagrande was invoked but never defined (see the help page).
  9. ^ "16 Cep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference wds was invoked but never defined (see the help page).