Zeta Cephei

Zeta Cephei
Location of ζ Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 22h 10m 51.277s[1]
Declination +58° 12′ 04.543″[1]
Apparent magnitude (V) 3.35[2]
Characteristics
Evolutionary stage Red supergiant
Spectral type K1.5 Ib[3]
B−V color index +1.55[2]
Variable type Eclipsing binary?[4]
Astrometry
Proper motion (μ) RA: 13.359±0.148 mas/yr[1]
Dec.: 5.275±0.183 mas/yr[1]
Parallax (π)3.2972 ± 0.1456 mas[1]
Distance992.7+51.2
−46 ly
(304.5+15.7
−14.1 pc)[5]
Absolute magnitude (MV)−4.7[6]
Details
Mass10.1±0.1[7] M☉
Radius172.7+7.5
−8.3[8] R☉
Luminosity10,024±1,052[8] L☉
Surface gravity (log g)0.75[9] cgs
Temperature4,393±58[8] K
Metallicity [Fe/H]+0.04[8] dex
Rotational velocity (v sin i)10.64[10] km/s
Other designations
21 Cephei, HR 8465, BD+57°2475, HD 210745, GCTP 5139.00, SAO 34137, FK5 836, HIP 109492, Gaia DR2 2199493438511811712, Gaia DR3 2199493438511811712
Database references
SIMBADdata

Zeta Cephei (ζ Cep, ζ Cephei) is a red supergiant star, located about 1000 light-years away in the constellation of Cepheus. Zeta Cephei marks the left shoulder of Cepheus, the King of Ethiopia. It is one of the fundamental stars of the MK spectral sequence, defined as type K1.5 Ib.

  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference mk was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference b-j was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference luck1982 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Machado2022 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference :4 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa352_495 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference hekker was invoked but never defined (see the help page).