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Proceedings Paper

Subaru Telescope: current performances and future upgrade plans
Author(s): Tomonori Usuda; Naruhisa Takato; Jun'ichi Morino; George Kosugi; Akihiko Miyashita; Junichi Noumaru; Tomio Kanzawa; Saeko S. Hayashi; Michael Letawsky; Takuya Yamashita; Noboru Itoh; Wataru Tanaka
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Paper Abstract

Subaru Telescope has currently achieved the following performances. 1. Image Quality. (1) Subaru Telescope delivers a median image size, evaluated by equipped Auto Guider (AG) cameras, of 0.6-0.7 arcsec FWHM in the R and I-band at all the four foci: Prime (P), Cassegrain (Cs), and tow Nasmyth (Ns). (2) The best image sizes obtained so far are 0.2 arcsecs FWHM without AO in near-infrared (IR), less than 0.1 arcsec FWHM with AO, and 0.3 arcsec FWHM in optical and mid-IR wavelengths. (3) Stable Shack-Hartmann measurement enables one to keep the errors of Zernike coefficients to less than 0.2μm which corresponds to ~0.1 arcsec image size. 2. Tracking and Pointing. (1) Blind pointing accuracy is better than 1 arcsec RMS over most of the sky. (2) Tracking accuracy is better than 0.2 arcsec RMS in 10 minutes. (3) Guiding accuracy is between 0.8 and 0.18 arcsec RMS with 12-18th magnitude guide stars. 3. IR secondary mirror (M2). (1) Chopping performances: typical figures are at 3 Hz, 80% duty cycle with 30-60 arcsec chopping throw. (2) Tip-Tilt performances: Position stability is about 0.030 arcsec RMS for the effective closed-loop bandwidth less than 5 Hz. 4. Others. (1) The reflectivity of the primary mirror has been maintained at higher than 85 and 95% at 670 and 1300 nm wavelengths by regular cleaning with CO2 ice every two to three weeks. (2) The reflectivity of the blue-side image rotator (ImR) at Nasmyth-optical focus was improved after re-coating of mirrors.

Paper Details

Date Published: 4 February 2003
PDF: 12 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.458228
Show Author Affiliations
Tomonori Usuda, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Naruhisa Takato, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Jun'ichi Morino, Subaru Telescope/National Astronomical Observatory of Japan (United States)
George Kosugi, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Akihiko Miyashita, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Junichi Noumaru, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Tomio Kanzawa, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Saeko S. Hayashi, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Michael Letawsky, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Takuya Yamashita, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Noboru Itoh, Mitsubishi Electric Co. (Japan)
Wataru Tanaka, Mitsubishi Electric Co. (Japan)


Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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