kSIRIUS: a simultaneous JHKs camera for the Kagoshima University 1m telescope using newly developed Japanese InGaAs array detectors

Takahiro Nagayama; Hidehiko Nakaya

doi:10.1117/12.3016593

18 July 2024 kSIRIUS: a simultaneous JHKs camera for the Kagoshima University 1m telescope using newly developed Japanese InGaAs array detectors

Takahiro Nagayama, Hidehiko Nakaya

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130963I (2024) https://doi.org/10.1117/12.3016593
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

We have developed a simultaneous near-infrared camera, kSIRIUS, for the Kagoshima University 1m telescope. This camera has three focal planes created by two dichroic beam splitters for the J (λ = 1.21μm), H (λ= 1.65μm), and Ks (λ = 2.15μm) bands. kSIRIUS is designed to have three ∼ 10′ × 10′ fields of view with a seeing-limited resolution (∼ 1.5′′ at Kagoshima University Iriki Observatory) all over the fields. However, we have not yet obtained large format array detectors, so three small InGaAs array detectors are placed at the three focal planes. These detectors, which have 320×256 pixels, are newly manufactured for astronomy at Hamamatsu Photonics K. K., Japan, in collaboration with us, and cover three 3.7′ × 2.9′ fields of view with a pixel scale of 0.69′′. These three detectors enable a simultaneous imaging observation of the J, H, and Ks bands. We performed a test observation of kSIRIUS on the 1m telescope in January 2023. The stellar image quality is reasonably good compared to the typical site seeing. We have also determined the limiting magnitudes as J: 16.3, H: 15.3, and Ks: 14.5 (270 sec integration, S/N = 10, Vega magnitude), which are consistent with the expected values. We also have an optical g′ and i′ band camera covering 10′×10′ fields of view, working together with kSIRIUS. This setup allows us to acquire five (g′i′JHKs) images simultaneously, and will be particularly useful for studying any kind of time variable targets.

Citation Download Citation

Takahiro Nagayama and Hidehiko Nakaya "kSIRIUS: a simultaneous JHKs camera for the Kagoshima University 1m telescope using newly developed Japanese InGaAs array detectors", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130963I (18 July 2024); https://doi.org/10.1117/12.3016593

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