The heterogeneity of papers dealing with the discovery and characterization of exoplanets makes every attempt to maintain a uniform exoplanet catalog almost impossible. Four sources currently available online (NASA Exoplanet Archive, Exoplanet Orbit Database, Exoplanet Encyclopaedia, and Open Exoplanet Catalogue) are commonly used by the community, but they can hardly be compared, due to discrepancies in notations and selection criteria. Exo-MerCat is a Python code that collects and selects the most precise measurement for all interesting planetary and orbital parameters contained in the four databases, accounting for the presence of multiple aliases for the same target. It can download information about the host star as well by the use of Virtual Observatory ConeSearch connections to the major archives such as SIMBAD and those available in VizieR. A Graphical User Interface is provided to filter data based on the user’s constraints and generate automatic plots that are commonly used in the exoplanetary community. With Exo-MerCat, we retrieved a unique catalog that merges information from the four main databases, standardizing the output and handling notation differences issues. Exo-MerCat can correct as many issues that prevent a direct correspondence between multiple items in the four databases as possible, with the available data. The catalog is available as a VO resource for everyone to use and it is periodically updated, according to the update rates of the source catalogs.

有关系外行星发现和表征的论文的异质性使得几乎不可能进行维持统一系外行星目录的任何尝试。社区目前通常使用四种在线资源（NASA系外行星档案，系外行星轨道数据库，系外行星百科全书和开放系外行星目录），但是由于符号和选择标准的差异，很难对它们进行比较。Exo-MerCat是一个Python代码，可以为四个数据库中包含的所有有趣的行星和轨道参数收集并选择最精确的测量值，并考虑到同一目标存在多个别名。它也可以通过使用虚拟天文台ConeSearch连接到主要档案（例如SIMBAD和VizieR中可用的档案）来下载有关宿星的信息。提供了一个图形用户界面，用于根据用户的约束条件过滤数据并生成系外行星社区中常用的自动绘图。使用Exo-MerCat，我们检索了一个独特的目录，该目录合并了来自四个主要数据库的信息，从而标准化了输出并处理了符号差异问题。Exo-MerCat可以纠正尽可能多的问题，这些问题会阻止四个数据库中的多个项目与可用数据之间的直接对应。该目录可作为VO资源提供给所有人使用，并且会根据源目录的更新率进行定期更新。我们检索了一个独特的目录，该目录合并了来自四个主要数据库的信息，从而标准化了输出并处理了符号差异问题。Exo-MerCat可以纠正尽可能多的问题，这些问题会阻止四个数据库中的多个项目与可用数据之间的直接对应。该目录可作为VO资源提供给所有人使用，并且会根据源目录的更新率进行定期更新。我们检索了一个独特的目录，该目录合并了来自四个主要数据库的信息，从而标准化了输出并处理了符号差异问题。Exo-MerCat可以纠正尽可能多的问题，这些问题会阻止四个数据库中的多个项目与可用数据之间的直接对应。该目录可作为VO资源提供给所有人使用，并且会根据源目录的更新率进行定期更新。