GTC-CHORUS 是在中西合作框架下正在为西班牙GTC望远镜研制的一台高分辨率超稳定光谱仪。它有望具有0.1米/秒量级的高精度视向速度测量能力，将推动国际天文学界的热点问题——搜寻与研究系外行星。这台光谱仪包括近紫外和可见光波段的两个光谱系统，共同提供在近紫外波段内光谱分辨率R≥20,000，在可见光波段内光谱分辨率R≥100,000的观测能力。除了高精度视向速度测量之外，这样仪器设计方案还可扩展类似研究极贫金属星、测量星系中最老恒星年龄等不同科学方向。
GTC-CHORUS is a high-resolution, ultra-stable spectrograph being developed for the GTC telescope in Spain under the framework of China-Spain cooperation. It is expected to have high-precision radial velocity measurement capabilities at the level of 0.1 meters per second, which will make scientific advances in several frontiers of astronomical research - searching for and studying exoplanets. This spectrograph includes two spectral systems for the near-ultraviolet and visible light bands, jointly providing observational capabilities with a spectral resolution of R≥20,000 in the near-ultraviolet band and R≥100,000 in the visible band. In addition to high-precision radial velocity and exoplanet atmosphere measurements, the design of this instrument can also enable other scientific investigations, such as studies of extremely metal-poor stars and measuring the ages of the oldest stars in the Galaxy.