Best focus approach of HinOTORI telescope

Liu, Wei; Nagashima, Hiroki; Kawabata, Koji S.; Sasada, Mahito; Yao, Yulong; Shi, Sheng‐Cai

doi:10.1117/12.2561919

Cited by 1 publication

(3 citation statements)

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“…We tested the telescope in terms of the image quality using the Hartmann test. The Hartmann test is a convenient way to evaluate image quality of an optical system [26,28]. At the top of the telescope tube, in front of the secondary mirror, we placed a Hartmann plate that has 20 equally distributed small holes.…”

Section: Image Quality and Focus Adjustment 41 Hartmann Testmentioning

confidence: 99%

“…The minimum value of rms of the deviations is Hartmann Constant (HC) and position where the rms value is minimum is defined as the best focus position [27]. In 2018, from the Hartmann test, we calculated HC of 𝑢 , 𝑅 C , and 𝐼 C bands were 0.49 ± 0.06, 0.56 ± 0.07 and 0.60 ± 0.07 arcsec, respectively [28].…”

Section: Image Quality and Focus Adjustment 41 Hartmann Testmentioning

confidence: 99%

“…We measured the focus positions of three channels in order to check whether the focus drifts are acceptable. By moving secondary mirror position, focus adjustment can be achieved [28]. The secondary mirror position from its mechanical origin was changed from 3.78 mm to 4.35 mm with the interval of 0.03 mm.…”

Section: Focus Adjustment For Each Channelmentioning

confidence: 99%

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Characterisations of the HinOTORI telescope with a three-color imager at Ali Observatory in Western Tibet

et al. 2022

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HinOTORI is a new telescope supported by an international collaboration project between China and Japan. It is a 50 centimeter telescope equipped with simultaneous three-color imagers (u', R C, and I C bands). It is located at Ali Observatory at an altitude of 5100m. Thanks to the high altitude and extreme dryness, Ali site is one of the most suitable sites for optical astrometry. HinOTORI telescope aims at detecting optical transients such as the counterparts of gravitational wave (GW) sources, supernovae, gamma-ray bursts (GRB) and so on. This paper describes the site information, design of simultaneous three-color optical layout, system instruments and whole control system. We also report some telescope characterisations for three bands (u'/R C/I C) respectively, such as Hartmann constant (0.49”/0.56”/0.60”), best focus position (3.922/3.920/3.903 mm), PSF FWHM size (3.755/3.328/3.167pixels), total transmittance and limiting magnitude (15.69/17.57/17.05mag, 10 σ 30 seconds exposure time). With different airmass observation data, the atmospheric extinction coefficients of three bands (0.366/0.061/0.026) were also derived.

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Section: Image Quality and Focus Adjustment 41 Hartmann Testmentioning

confidence: 99%

Section: Image Quality and Focus Adjustment 41 Hartmann Testmentioning

confidence: 99%