We present Mookodi (meaning “rainbow” in Sesotho), a multipurpose instrument with a low-resolution spectrograph mode and a multi-filter imaging mode for quick-reaction astronomical observations. The instrument, mounted on the 1-m Lesedi telescope at the South African Astronomical Observatory in Sutherland (South Africa), is based on the low-resolution spectrograph for the rapid acquisition of transients (SPRAT) instrument in operation on the 2-m Liverpool Telescope in La Palma (Canary Islands, Spain). Similar to SPRAT, Mookodi has a resolution R≈350 and an operating wavelength range in the visible (∼4000 to 8000 Å). The linear optical design, as in SPRAT, is made possible through the combination of a volume phase holographic transmission grating as the dispersive element and a prism pair (grism), which makes it possible to rapidly and seamlessly switch to an imaging mode by pneumatically removing the slit and grism from the beam and using the same detector as in spectrographic mode to image the sky. This imaging mode is used for auto-target acquisition, but the inclusion of filter slides in Mookodi’s design also provides the capability to perform imaging with a field-of-view ≈10′×10′ (∼0.6″/px) in the complete Sloan Digital Sky Survey filter set.

中文翻译：

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Mookodi：多用途低分辨率摄谱仪和多滤光片光度成像仪，用于快速跟踪天文瞬态事件

我们推出了 Mookodi（塞索托语中“彩虹”的意思），这是一种多功能仪器，具有低分辨率摄谱仪模式和多滤波器成像模式，用于快速反应天文观测。该仪器安装在萨瑟兰（南非）南非天文台的 1 米 Lesedi 望远镜上，以 2 米利物浦天文台上运行的低分辨率瞬态快速采集光谱仪 (SPRAT) 为基础拉帕尔马岛（西班牙加那利群岛）的望远镜。与 SPRAT 类似，Mookodi 的分辨率为 R≈350，工作波长范围为可见光（∼4000 至 8000 Å）。与 SPRAT 一样，线性光学设计是通过将体积相位全息传输光栅作为色散元件和棱镜对（棱镜）相结合而实现的，这使得通过气动移除可以快速、无缝地切换到成像模式。光束的狭缝和棱镜，并使用与光谱模式相同的探测器对天空进行成像。这种成像模式用于自动目标采集，但 Mookodi 设计中包含的滤镜幻灯片还提供了在完整的视野中执行成像的能力 ≈10′×10′ (∼0.6″/px)斯隆数字巡天滤镜组。