盖亚第二次数据释放
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盖亚卫星是在欧洲航天局伊巴谷卫星工作的基础上，希望解决现代天文学中最困难、最基本的一个问题：创建一个包括整个银河系和其它区域的大约10亿颗恒星的非常精确的三维地图。盖亚的大规模恒星普查为此提供了基本的观测数据，帮助天文学家理解银河系的起源、结构和演化历史等重要问题。盖亚卫星提供了一个在观测范围、准确性和完整性方面都前所未有的数据库。盖亚卫星于2013年底发射，本次数据释放是盖亚的第二次数据释放，是盖亚卫星于2014年7月25日至2016年5月23日期间（22个月）的观测数据，相对于第一次数据释放在完备度、性能、丰富度方面有明显的提升。本次数据释放包含天测、测光、视向速度、天体物理参数和变化信息，此外还包括一部分太阳系内小行星的多次天测和测光信息。更新信息详见https://www.cosmos.esa.int/web/gaia/dr2。
The Gaia satellite, building upon the work of the European Space Agency's Hipparcos satellite, aims to solve one of the most difficult and fundamental problems in modern astronomy: creating an extremely precise 3D map of approximately 1 billion stars across the entire Milky Way and other regions. Gaia's massive stellar census provides the foundational observational data for this initiative, allowing astronomers to investigate critical questions such as the origin, structure, and evolutionary history of the Milky Way. The Gaia satellite has produced an unprecedented database in terms of observational scope, accuracy, and completeness. Launched in late 2013, this data release is Gaia's second data release (DR2), which encompasses 22 months of observational data collected between July 25, 2014 and May 23, 2016. Compared to the first data release, it offers substantial enhancements in completeness, performance, and data richness. This release contains astrometric, photometric, radial velocity, astrophysical parameter, and variability information, as well as multiple astrometric and photometric observations for a subset of Solar System asteroids. For detailed update information, please refer to https://www.cosmos.esa.int/web/gaia/dr2.
