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Theta2 Orionis
Theta2 Orionis (θ2 Ori) is a multiple star system in the constellation Orion (constellation), Orion. It is a few arc minutes from its more famous neighbour the Trapezium Cluster, also known as θ1 Orionis. Components θ2 Orionis consists of three stars in a line, each about an arc-minute from the next. In addition to the well-known three stars, the Washington Double Star Catalog confusingly lists a component D which is actually Theta1 Orionis C, θ1 Orionis C. There is one other star brighter than 10th magnitude in the region. V1073 Orionis is a B9.5 Orion variable that forms an equilateral triangle with θ2 Ori B and C. Bizarrely, θ2 Orionis C has a second entry in the Washington Double Star Catalog under the name S490. The companion is 10th magnitude and actually lies between θ2 Ori B and V1073 Ori. θ1 Orionis, the well known Trapezium cluster, is only 2 arc minutes away from θ2 Orionis A. Despite the names, θ2 Orionis A is marginally brighter than t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta2Orionis
Theta (, ) uppercase Θ or ; lowercase θ or ; ''thē̂ta'' ; Modern Greek, Modern: ''thī́ta'' ) is the eighth letter of the Greek alphabet, derived from the Phoenician alphabet, Phoenician letter Teth 𐤈. In the system of Greek numerals, it has a value of 9. Greek In Ancient Greek, θ represented the aspiration (phonetics), aspirated voiceless dental plosive , but in Modern Greek it represents the voiceless dental fricative . Forms In its Archaic Greek alphabets, archaic form, θ was written as a cross within a circle (as in the Etruscan or ), and later, as a line or point in circle ( or ). The cursive form was retained by Unicode as , separate from . (There is also .) For the purpose of writing Greek text, the two can be font variants of a single character, but are also used as distinct symbols in technical and mathematical contexts. Extensive lists of examples follow below at Mathematics and Science. is also common in biblical and theological usage e.g. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
