GAOES-RV (Gunma Astronomical Observatory Echelle Spectrograph for Radial Velocimetry) is a high-dispersion echelle spectrograph for the 3.8 m Seimei Telescope at Okayama Observatory, Kyoto University. It covers the wavelength band from 516 to 593 nm and provides reciprocal resolution of 65,000. To maintain both the throughput and wavelength resolution of the observing system, starlight is collected in a 2.4 arc-second diameter field of view at the Nasmyth focus with a multimode optical fiber, and an image slicer is used at the other end of the fiber link. An iodine absorption cell is used for precise radial velocity measurements, and currently a precision of about 2 m/s can be achieved for bright solar-type stars. GAOES-RV has been in operation since July 2023, and is widely used for a variety of scientific observations, including the detection and characterization of exoplanets, stellar abundance analysis, and research on active stars.
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