Over the past decade, time-domain astronomy in optical bands has developed rapidly with the operations of some wide-field survey facilities. However, most of these surveys are conducted with only a single band, and simultaneous color information is usually unavailable for the objects monitored during the survey. Here we present introductions to the system of Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), which consists of an array of four optical telescopes installed on a single equatorial mount. Such a system is designed to get multiband photometry simultaneously for stars and transients discovered during the survey. The optics of each telescope is a modified Hamilton-Newtonian system, covering the wavelengths from 400 nm to 900 nm, with a field of view (FoV) of about 4.5 deg and a plate scale of 1.86/pixel when combining with a 4K×4K QHY4040 CMOS detector. The TMTS system can have a FoV of about 9 deg when monitoring the sky with two bands (i.e., SDSS g and r filters) at the same time, and a maximum FoV of ∼18 deg when four telescopes monitor different sky areas in monochromatic filter mode. For an exposure time of 60s, the average 3-σ detection limit of the TMTS system can reach at ∼19.4 mag in Luminous filter and at ∼18.7 mag in SDSS r filter. The preliminary discovery obtained during the first few months’ survey is briefly discussed. As this telescope array is located at the Xinglong Observatory of NAOC, it can have an excellent synergy with the spectroscopic survey by the LAMOST (with a FoV of about 20 deg) at the same site, which will benefit the studies of stellar and binary physics besides the transient sciences.

中文翻译：

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清华大学-马化腾勘测望远镜：系统概述和性能

近十年来，随着一些广域测量设施的运行，光波段时域天文学发展迅速。然而，这些调查中的大多数只用单一波段进行，并且通常无法获得调查期间监测对象的同步颜色信息。在这里，我们介绍了清华大学-马化腾巡天望远镜（TMTS）系统，该系统由安装在单个赤道仪上的四个光学望远镜阵列组成。这样的系统旨在同时对调查期间发现的恒星和瞬变进行多波段光度测量。每个望远镜的光学系统都是经过修改的哈密顿-牛顿系统，覆盖了 400 纳米到 900 纳米的波长，视场 (FoV) 约为 4.5 度，平板比例为 1。与 4K×4K QHY4040 CMOS 检测器结合使用时为 86/像素。TMTS 系统在同时使用两个波段（即 SDSS g 和 r 滤光片）监测天空时可以有大约 9 度的视场，当四个望远镜在单色滤光片中监测不同的天空区域时，最大视场约为 18 度模式。对于 60 s 的曝光时间，TMTS 系统的平均 3-σ 检测极限在 Luminous 滤波器中可​​达到~19.4 mag，在 SDSS r 滤波器中可​​达到~18.7 mag。简要讨论了在最初几个月的调查中获得的初步发现。由于该望远镜阵列位于国家海洋委员会兴隆天文台，与LAMOST同站光谱巡天（视场角约20度）具有极好的协同作用，将有利于恒星和双星物理的研究除了瞬态科学。