Omega Eridani
Template:Short description Template:Starbox begin Template:Starbox observe Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end Omega Eridani (ω Eri) is a single[1] star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude is 4.37.[2] The distance to this star, as determined by the parallax method, is around 235 light years.
It is an A-type subgiant star with a stellar classification of A9 IVn,[3] where the 'n' suffix indicates a broad ("nebulous") absorption due to rotation. The projected rotational velocity is 186[4] km/s.[4] This gives the star an oblate shape with an equator that is 13% wider than the polar radius. The angular size of Omega Eridani is 0.87 mas.[5] At an estimated distance of the star, this yields a physical size of around 6.7 times the radius of the Sun.[6]
Omega Eridani was long thought to be a is a single-lined spectroscopic binary system, with an orbital period of 3,057 days (8.4 years) and an eccentricity of 0.46.[7] However, newer and higher-quality radial velocity observations find no evidence for a companion, casting serious doubt on the status of Omega Eridani as a binary star.[1]
References
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