Omega Cassiopeiae
Omega Cassiopeiae (ω Cassiopeiae) is a binary star system in the northern constellation of Cassiopeia. It has a combined apparent visual magnitude of +4.99, 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, this system is located roughly 700 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.16 due to interstellar dust.

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 B8 III. 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. Omega Cassiopeiae has an estimated 4.7 times the mass of the Sun and is radiating 488 times the Sun's luminosity from its photosphere at an effective temperature of around 12,737 K.
Q50053
binary star
Concept
Q8928
constellation
Concept
Q10464
Cassiopeia
CEL
Q124313
apparent visual magnitude
Concept
Q906561
parallax shift
Concept
Q12097402
mas
Concept
Q531
light year
Concept
Q525
Sun
CEL
Q943247
extinction
Concept
Q193384
interstellar dust
Concept
Q50053
spectroscopic binary
Concept
Q37640
orbital period
Concept
Q208474
eccentricity
Concept
Q752171
spectrum
Concept
Q6472
evolved
Concept
Q25377588
B-type
Concept
Q5875
giant star
Concept
Q25377588
stellar classification
Concept
Q65042498
helium-weak star
Concept
Q1142192
chemically peculiar star
Concept
Q212111
absorption lines
Concept
Q180892
mass of the Sun
Concept
Q843877
Sun's luminosity
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q3232723
Omega Cassiopeiae
CEL
Q3232723
Omega Cassiopeiae
CEL
++4.99^^http://www.w3.org/2001/XMLSchema#decimal
+4.99
NUMBER
+4.65^^http://www.w3.org/2001/XMLSchema#decimal
4.65
NUMBER
+0.16^^http://www.w3.org/2001/XMLSchema#decimal
0.16
NUMBER
+69.92^^http://www.w3.org/2001/XMLSchema#decimal
69.92
NUMBER
+0.30^^http://www.w3.org/2001/XMLSchema#decimal
0.30
NUMBER
+8^^http://www.w3.org/2001/XMLSchema#decimal
8
NUMBER
+4.7^^http://www.w3.org/2001/XMLSchema#decimal
4.7
NUMBER
constellation
mass
instance of
subclass of