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オリオン座シータ星.
オリオン座シータ星 シータ1とシータ2がある。
トラペジウム 5等級 4重星
スペクトル型…O型 表面温度 約42300度。名称 トラペジウムは「台形」を意味する。天体望遠鏡で見ると構成される明るい星は台形に見える。
オリオン大星雲(M42)で生成されたとても若い星団である。
バイエル符号 Orionisθ(シータOrionis)は、いくつかの近くに位置する天体によって共有されるRA 05 H 35 m個 12月 -05°24 '。
- θ 1 Orionis(41 Orionis)、トラペジウムクラスター、散開星団、オリオンOB1D
- θ 1 Orionis A(41 Orionis A、HD 37020、V1016 Orionis)、三連星系
- θ 1 Orionis B(41 Orionis B、HD 37021)、五連星系
- θ 1 Orionis B WEST(COUP 766、MAX 97)、X線源
- θ 1 Orionis B EAST(COUP 778、MAX 101)、X線源
- θ 1 Orionis C(41 Orionis C、HD 37022)、二連星系
- θ 1 Orionis D(41 Orionis D、HD 37023)、B0.5Vp変光星
- θ 1 Orionis E(COUP 732)、分光連星系
- θ 1 Orionis F、B8変光星
- θ 1 Orionis G(COUP 826、MAX 116)、若い星状天体
- θ 1 Orionis H(COUP 746、MAX 87)、若い星状天体
- θ 2 Orionis(43 Orionis)
- θ 2 Orionis A(43 Orionis、HD 37041)、分光三連星
- θ 2 Orionis B(HD 37042)、B1V変光星
- θ 2 Orionis C(HD 37062)、連星系
これらを構成する星団は、オリオン星雲内および近隣数分の領域にわたって広がっている。
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