Differential astrometry measurements from the Palomar High-precisionAstrometric Search for Exoplanet Systems have been combined with lowerprecision single-aperture measurements covering a much longer timespan (fromeyepiece measurements, speckle interferometry, and adaptive optics) todetermine improved visual orbits for 20 binary stars. In some cases, radialvelocity observations exist to constrain the full three-dimensional orbit anddetermine component masses. The visual orbit of one of these binaries---alphaCom (HD 114378)---shows that the system is likely to have eclipses, despite itsvery long period of 26 years. The next eclipse is predicted to be within a weekof 2015 January 24.
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机译：Palomar High-precisionAstrometric Search for Exoplanet Systems的差分天文测量技术已与覆盖更长的时间跨度的较低精度的单孔径测量技术（从目镜测量，散斑干涉测量法和自适应光学系统）结合在一起，从而确定了20个双星的视觉轨道。在某些情况下，存在径向速度观测值以约束整个三维轨道并确定分量质量。这些二进制文件之一-alphaCom（HD 114378）的视觉轨道表明，尽管该系统很长的26年时间，它仍可能会出现日食。预计下一次日食发生在2015年1月24日之前的一周。
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