Omega Cassiopeiae

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Template:Short description

ω Cassiopeiae
Template:Location mark
Location of ω Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +4.99[3]
Characteristics
Spectral type B5 III[4]
U−B Template:Engvar −0.41[5]
B−V Template:Engvar −0.09[5]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[6] km/s
Proper motion (μ) RA: 15.067[2] mas/yr
Dec.: −10.313[2] mas/yr
Parallax (π)4.4802±0.0912 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.09[7]
Orbit[8]
Period (P)69.92 d
Eccentricity (e)0.30
Periastron epoch (T)2420426.02 JD
Argument of periastron (ω)
(secondary)		50°
Semi-amplitude (K1)
(primary)		29.6 km/s
Details
ω Cas A
Mass3.5[9] Template:Solar mass
Radius2.7[9] Template:Solar radius
Luminosity178[9] Template:Solar luminosity
Surface gravity (log g)4.1[9] cgs
TemperatureScript error: No such module "val".[10] K
Rotational velocity (v sin i)45.7[11] km/s
Age232[7] Myr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[12]
Database references
SIMBADdata

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Omega Cassiopeiae (ω Cassiopeiae) is a binary star[3] system in the northern constellation of Cassiopeia. It has a combined apparent visual magnitude of +4.99,[3] which means it is a faint star but visible to the naked eye. Based upon an annual parallax shift of 4.65 mas as seen from Earth,[13] this system is located roughly 730 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.16 due to interstellar dust.[7]

This is a single-lined spectroscopic binary star system with an orbital period of 69.92 days and an eccentricity of 0.30. The visible component has the spectrum of an evolved, B-type giant star with a stellar classification of B5 III.[4] It is a helium-weak star, a type of chemically peculiar star that displays abnormally weak absorption lines of helium for a star of its temperature.[14] Omega Cassiopeiae has an estimated 3.5 times the mass of the Sun and is radiating 178 times the Sun's luminosity from its photosphere at an effective temperature of around Script error: No such module "val"..[10]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e Template:Cite Gaia EDR3
  3. ↑ a b c Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b c Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b c d Script error: No such module "citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Template:Cite simbad
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Cassiopeia

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