In 2015 a radial velocity monitoring campaign was started in order to redetermine and/or constrain the orbital solutions of spectroscopic binary systems. The observations were carried out at the University Observatory Jena with the \'Echelle spectrograph FLECHAS. The results from the main part of our target sample are already published. For the final target of this campaign, $\theta$ Cep, we can now present an orbital solution based on a homogeneously covered radial velocity curve. The period of this single-lined spectroscopic binary turns out to be significantly larger and the orbit is much more eccentric compared to the given values in the 9th Catalogue of Spectroscopic Binary Orbits.

中文翻译：

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长周期双星系统 θ Cep 的光谱轨道确定

2015 年开始了径向速度监测活动，以重新确定和/或约束光谱双星系统的轨道解。观测是在耶拿大学天文台用 \'Echelle 光谱仪 FLECHAS 进行的。我们目标样本的主要部分的结果已经发布。对于本次活动的最终目标 $\theta$ Cep，我们现在可以基于均匀覆盖的径向速度曲线提出轨道解决方案。与第九个光谱双星轨道目录中的给定值相比，这个单线光谱双星的周期明显更大，轨道也更偏心。