19 Cephei

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Template:Short description

19 Cep
Template:Location mark
Location of 19 Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 5.08[2]
Characteristics
Spectral type O9Ib[3]
U−B Template:Engvar −0.91[2]
B−V Template:Engvar +0.06[2]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[4] km/s
Proper motion (μ) RA: −1.16[1] mas/yr
Dec.: −2.96[1] mas/yr
Parallax (π)1.58±0.19 mas[1]
Distance3,910 ly
(1,200[5] pc)
Absolute magnitude (MV)−5.45[6]
Details
Mass47[7] Template:Solar mass
Radius17.0[3] Template:Solar radius
Luminosity224,000[3] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[8] dex
Rotational velocity (v sin i)48[3] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
19 Cep, BD+61°2246, HD 209975, HIP 109017, HR 8428, SAO 19849.
Database references
SIMBADdata

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19 Cephei is a supergiant star in the northern circumpolar constellation of Cepheus. It has a spectral class of O9 and is a member of Cep OB2, an OB association of massive stars located about Script error: No such module "convert". from the Sun.

The spectrum of 19 Cephei shows line profile variability on an hourly and daily timescale. This is thought to be due to the changes in the stellar wind.[3]

Double star catalogues list several companions for 19 Cephei. The Washington Double Star Catalog describes four companions: 11th magnitude stars 20" and 56" away, and two 15th magnitude stars 4-5" away.[9] The Catalog of Components of Double and Multiple Stars gives only the two 11th magnitude stars.[10]

A scattered cluster of faint stars has been detected associated with 19 Cephei. The brightest likely members apart from 19 Cep itself are 10th magnitude stars.[11]

References

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  1. ↑ a b c d e Script error: No such module "citation/CS1".Vizier catalog entry
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  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".

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External links

Template:Stars of Cepheus

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