Design, Testing, and Commissioning of the Sun Yat-sen University (SYSU) 80 cm Infrared Telescope
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arXiv
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| Natura: | Preprint |
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2026
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| _version_ | 1866914527677775872 |
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| author | Dong, Zhong-Nan Ma, Bin Chen, Chun Huang, Wei-Sen Li, Jin-Ji Lin, Jia-Qi Shi, Yun Zhang, Hao-Ran Cao, Duo-Le Chen, Bao-Gang Deng, Tai-Ran Gao, Rui-Chen Hu, Yi Li, Hong-Zhuang Li, Xia Lin, Pu Liu, Yang Ma, Bo Shen, Rong-Feng Song, Li-Duo Xu, Fang-Yu Yang, Hao-Nan Yu, Yan Yuan, Jun Zeng, Xiang-Tao Zheng, Hao-Yuan |
| author_facet | Dong, Zhong-Nan Ma, Bin Chen, Chun Huang, Wei-Sen Li, Jin-Ji Lin, Jia-Qi Shi, Yun Zhang, Hao-Ran Cao, Duo-Le Chen, Bao-Gang Deng, Tai-Ran Gao, Rui-Chen Hu, Yi Li, Hong-Zhuang Li, Xia Lin, Pu Liu, Yang Ma, Bo Shen, Rong-Feng Song, Li-Duo Xu, Fang-Yu Yang, Hao-Nan Yu, Yan Yuan, Jun Zeng, Xiang-Tao Zheng, Hao-Yuan |
| contents | The Sun Yat-sen University (SYSU) 80 cm telescope is a new generation near-infrared (NIR) facility in China dedicated to time-domain astronomy, while also serving as a testbed for emerging NIR cameras. Commissioned in October 2024 at the 4100 m Lenghu site on the Tibetan Plateau in China, the telescope adopts a reflective Cassegrain design with two Nasmyth foci for J and K bands. The J band imaging system, initially equipped with a 640 x 512 off-the-shelf InGaAs camera (INS Mars640) and upgraded in June 2025 to a 1280 x 1024 science-grade, deeply cooled camera (YNAOIR), achieves background-limited performance with a dark current of ~ 14 e-/s/pix and a readout noise of ~ 11 e-. The system reaches a limiting magnitude of J ~ 17 mag (Vega system) in single 20 s exposures and depths of J ~ 19.4 mag with stacked 30 minute exposures. For a variable with J ~ 14 mag during on-sky tests, the system delivers millimagnitude-level photometric precision. Since commissioning, the telescope observed transients such as gamma-ray bursts (GRBs), supernovae and comets, variables including active galactic nuclei (AGNs), high-redshift quasars (z > 6), and brown dwarfs, as well as deep-field imaging reaching J ~ 20.5 mag. This validates the feasibility of using InGaAs cameras for astronomical observations, encouraging other institutions to develop dedicated infrared telescopes or integrate infrared cameras into existing optical telescopes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_02339 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Design, Testing, and Commissioning of the Sun Yat-sen University (SYSU) 80 cm Infrared Telescope Dong, Zhong-Nan Ma, Bin Chen, Chun Huang, Wei-Sen Li, Jin-Ji Lin, Jia-Qi Shi, Yun Zhang, Hao-Ran Cao, Duo-Le Chen, Bao-Gang Deng, Tai-Ran Gao, Rui-Chen Hu, Yi Li, Hong-Zhuang Li, Xia Lin, Pu Liu, Yang Ma, Bo Shen, Rong-Feng Song, Li-Duo Xu, Fang-Yu Yang, Hao-Nan Yu, Yan Yuan, Jun Zeng, Xiang-Tao Zheng, Hao-Yuan Instrumentation and Methods for Astrophysics The Sun Yat-sen University (SYSU) 80 cm telescope is a new generation near-infrared (NIR) facility in China dedicated to time-domain astronomy, while also serving as a testbed for emerging NIR cameras. Commissioned in October 2024 at the 4100 m Lenghu site on the Tibetan Plateau in China, the telescope adopts a reflective Cassegrain design with two Nasmyth foci for J and K bands. The J band imaging system, initially equipped with a 640 x 512 off-the-shelf InGaAs camera (INS Mars640) and upgraded in June 2025 to a 1280 x 1024 science-grade, deeply cooled camera (YNAOIR), achieves background-limited performance with a dark current of ~ 14 e-/s/pix and a readout noise of ~ 11 e-. The system reaches a limiting magnitude of J ~ 17 mag (Vega system) in single 20 s exposures and depths of J ~ 19.4 mag with stacked 30 minute exposures. For a variable with J ~ 14 mag during on-sky tests, the system delivers millimagnitude-level photometric precision. Since commissioning, the telescope observed transients such as gamma-ray bursts (GRBs), supernovae and comets, variables including active galactic nuclei (AGNs), high-redshift quasars (z > 6), and brown dwarfs, as well as deep-field imaging reaching J ~ 20.5 mag. This validates the feasibility of using InGaAs cameras for astronomical observations, encouraging other institutions to develop dedicated infrared telescopes or integrate infrared cameras into existing optical telescopes. |
| title | Design, Testing, and Commissioning of the Sun Yat-sen University (SYSU) 80 cm Infrared Telescope |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2605.02339 |