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arxiv: 2605.02339 · v1 · submitted 2026-05-04 · 🌌 astro-ph.IM

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Design, Testing, and Commissioning of the Sun Yat-sen University (SYSU) 80 cm Infrared Telescope

Zhong-Nan Dong , Bin Ma , Chun Chen , Wei-Sen Huang , Jin-Ji Li , Jia-Qi Lin , Yun Shi , Hao-Ran Zhang
show 18 more authors
Duo-Le Cao Bao-Gang Chen Tai-Ran Deng Rui-Chen Gao Yi Hu Hong-Zhuang Li Xia Li Pu Lin Yang Liu Bo Ma Rong-Feng Shen Li-Duo Song Fang-Yu Xu Hao-Nan Yang Yan Yu Jun Yuan Xiang-Tao Zeng Hao-Yuan Zheng
Authors on Pith no claims yet

Pith reviewed 2026-05-08 18:28 UTC · model grok-4.3

classification 🌌 astro-ph.IM
keywords infrared telescopeInGaAs cameratelescope commissioningnear-infrared imagingtime-domain astronomyphotometric precisionLimiting magnitude
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The pith

The SYSU 80 cm telescope achieves background-limited J-band imaging with a limiting magnitude of 17 in single 20 s exposures.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reports the design, testing, and commissioning of a new 80 cm near-infrared telescope at the 4100 m Lenghu site. It uses a reflective Cassegrain layout with Nasmyth foci for J and K bands, initially fitted with an off-the-shelf InGaAs camera and later upgraded to a science-grade cooled detector. The J-band system shows a dark current of roughly 14 electrons per second per pixel and readout noise near 11 electrons, reaching J approximately 17 in 20-second exposures and J approximately 19.4 in 30-minute stacks while delivering millimagnitude photometric precision on J approximately 14 variables. These results allow observations of gamma-ray bursts, supernovae, active galactic nuclei, high-redshift quasars, brown dwarfs, and deep fields to J approximately 20.5. The work demonstrates that InGaAs detectors can support astronomical time-domain work and supports the idea of adding similar infrared capability to other telescopes.

Core claim

The commissioned SYSU 80 cm telescope, equipped with InGaAs cameras on its J-band Nasmyth focus, delivers background-limited performance with a dark current of approximately 14 e-/s/pix and readout noise of approximately 11 e-, attaining a limiting magnitude of J approximately 17 in single 20 s exposures and J approximately 19.4 with 30-minute stacks, together with millimagnitude-level photometric precision for a J approximately 14 variable.

What carries the argument

The reflective Cassegrain design with two Nasmyth foci, paired with InGaAs detectors (initially 640 by 512 and later 1280 by 1024) that achieve background-limited operation at the Lenghu site.

If this is right

  • The telescope has already observed gamma-ray bursts, supernovae, comets, active galactic nuclei, high-redshift quasars, brown dwarfs, and deep fields reaching J approximately 20.5.
  • Millimagnitude precision on J approximately 14 objects supports time-domain studies of variables.
  • The results validate off-the-shelf and science-grade InGaAs cameras for astronomical use.
  • The facility functions as a testbed that can encourage other sites to add dedicated infrared imaging.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • InGaAs cameras could be added to existing optical telescopes to gain near-infrared time-domain capability without building entirely new facilities.
  • The 4100 m site performance may extend to other high-altitude locations for similar NIR observations of transients.
  • Further upgrades to the K-band channel could broaden the wavelength coverage for the same optical design.

Load-bearing premise

The reported dark current, readout noise, limiting magnitudes, and photometric precision were measured under representative on-sky conditions without significant unaccounted systematics or post-processing effects.

What would settle it

Independent on-sky tests that find the dark current substantially above 14 e-/s/pix or the single-exposure limiting magnitude worse than J approximately 17 would show the claimed background-limited performance does not hold.

Figures

Figures reproduced from arXiv: 2605.02339 by Bao-Gang Chen, Bin Ma, Bo Ma, Chun Chen, Duo-Le Cao, Fang-Yu Xu, Hao-Nan Yang, Hao-Ran Zhang, Hao-Yuan Zheng, Hong-Zhuang Li, Jia-Qi Lin, Jin-Ji Li, Jun Yuan, Li-Duo Song, Pu Lin, Rong-Feng Shen, Rui-Chen Gao, Tai-Ran Deng, Wei-Sen Huang, Xia Li, Xiang-Tao Zeng, Yang Liu, Yan Yu, Yi Hu, Yun Shi, Zhong-Nan Dong.

Figure 1
Figure 1. Figure 1: (a) The Sun Yat-sen University 80 cm infrared telescope at Lenghu on the Tibetan Plateau. (b) Optical path of the J band system. (c) Pointing error maps across different azimuth and elevation angles. The left panel shows the uncorrected results (RMS ∼ 22.4′′), and the right panel shows the results after pointing model correction (RMS ∼ 5.7′′). (d) and (e) represent the telescope’s open-loop tracking accura… view at source ↗
Figure 2
Figure 2. Figure 2: Laboratory performance characterization for the INS Mars640 (top row) and YNAOIR (bottom row) cameras, featuring frame noise distributions (left column) and non-linearity tests (right column). For the INS Mars640: the 20 s dark current frame (middle gain) shows background noise roughly twice higher in outer ∼40-pixel border and up to ∼5× higher in the upper-left corner. Its non-linearity remains below 1% b… view at source ↗
Figure 3
Figure 3. Figure 3: (a) Distortion pattern across the focal plane. The pixel scale is 0.485′′ pixel−1 , and the distortion amplitude remains below 0.05%. (b) Astrometric accuracy for 1084 stars in NGC 6819, showing astrometry RMS accuracy of 0.06′′ in both RA and DEC relative to Gaia EDR3. (c) Lucky-imaging PSF. A Moffat profile, with its shape parameter β converging at ∼ 1.5, yields a FWHM of 0.5 ′′, providing a more robust … view at source ↗
Figure 4
Figure 4. Figure 4: Photometric precision analysis. (a) Noise characterization of 20 s on-sky exposures obtained with the INS Mars640 camera. The noise is dominated by dark current. (b) Noise characterization of 20 s on-sky exposures obtained with the YNAOIR camera. The noise is dominated by sky background. (c) Light curves of CSS J040017.9+382426 obtained with the SYSU 80 cm infrared telescope using the INS Mars640 camera on… view at source ↗
Figure 5
Figure 5. Figure 5: (a) Light curves of GRB infrared afterglows detected by the SYSU 80 cm infrared telescope. (b) Light curve of SIMP J013656.5+093347 obtained on November 18, 2024, spanning approximately 3.1 hours. GRB 250404A, GRB 251002A, and GRB 251013C (Z.-N. Dong et al. 2024; C. Chen et al. 2025; D.-L. Cao et al. 2025; H.-R. Zhang et al. 2025), as presented in view at source ↗
Figure 6
Figure 6. Figure 6: SYSU 80cm J band images (a) Image subtraction demonstration for SN 2024xal. Left: Science (sample) image obtained on 2024 October 27 with the SYSU 80 cm telescope. Middle: Reference (template) image taken on 2024 December 21, in which SN 2024xal is not detected to a 5σ limiting magnitude of 18.5 mag. Right: Subtracted image (science − template) clearly revealing the supernova. (b) Stacked image of 3I/ATLAS… view at source ↗
read the original abstract

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.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript describes the design, testing, and commissioning of the SYSU 80 cm infrared telescope at the 4100 m Lenghu site. It details a reflective Cassegrain system with two Nasmyth foci for J and K bands, initially using an off-the-shelf 640x512 InGaAs camera (INS Mars640) and upgraded to a 1280x1024 science-grade cooled camera (YNAOIR). The paper reports lab and on-sky results showing background-limited performance with dark current ~14 e-/s/pix and readout noise ~11 e-, limiting magnitudes of J~17 (Vega) in single 20 s exposures and J~19.4 with 30 min stacks, millimagnitude photometric precision for J~14 mag variables, and successful observations of GRBs, supernovae, comets, AGNs, z>6 quasars, brown dwarfs, and deep fields to J~20.5 mag. It concludes that InGaAs cameras are viable for astronomical NIR observations.

Significance. If the reported metrics hold, the work is significant as a documented case study of a new dedicated NIR facility for time-domain astronomy at a high-altitude site, serving also as a testbed for emerging cameras. The explicit lab measurements for detector properties, on-sky tests with described observing conditions and data reduction steps, and example light curves provide direct empirical support for the performance claims and address concerns about unaccounted systematics. This strengthens the validation of InGaAs technology and offers a practical reference for other institutions developing similar systems.

minor comments (2)
  1. The abstract and main text would benefit from a brief clarification of the timeline between commissioning (October 2024) and camera upgrade (June 2025) to indicate which performance figures correspond to which configuration.
  2. Consider adding a table summarizing the key on-sky test parameters (e.g., exposure times, number of frames, typical seeing or airmass) alongside the reported limiting magnitudes and precision values for easier reference.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive and encouraging review of our manuscript describing the design, testing, and commissioning of the SYSU 80 cm Infrared Telescope. We appreciate the recognition of the work's significance as a case study for a dedicated NIR facility and the validation of InGaAs technology, as well as the recommendation to accept.

Circularity Check

0 steps flagged

No significant circularity; empirical measurements only

full rationale

The manuscript reports direct empirical results from telescope design, lab testing of the InGaAs detectors (dark current ~14 e-/s/pix, readout noise ~11 e-), and on-sky commissioning observations at Lenghu. Limiting magnitudes (J~17 in 20s, J~19.4 in 30min stacks) and millimagnitude photometric precision are tied to explicit measurements under stated conditions with no intervening derivations, parameter fits, or predictions that reduce to the inputs by construction. No self-citations, ansatzes, or uniqueness theorems are invoked to support the performance claims. The derivation chain is therefore self-contained as straightforward reporting of observed quantities.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claims rest on empirical on-site measurements and standard telescope engineering practices rather than new theoretical constructs or fitted parameters.

axioms (1)
  • domain assumption Standard assumptions of reflective telescope optics, detector characterization, and astronomical photometry hold under the reported site conditions.
    The performance numbers presuppose that conventional models of background-limited imaging and photometric error apply without unstated site-specific or instrument-specific deviations.

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