Temperature control for the primary mirror and seeing statistics of the Subaru Telescope

Akihiko Miyashita; Ryusuke Ogasawara; Naruhisa Takato; George Kosugi; Tadafumi Takata; Fumihiro Uraguchi

doi:10.1117/12.458192

4 February 2003 Temperature control for the primary mirror and seeing statistics of Subaru Telescope

Akihiko Miyashita, Ryusuke Ogasawara, Naruhisa Takato, George Kosugi, Tadafumi Takata, Fumihiro Uraguchi

Proceedings Volume 4837, Large Ground-based Telescopes; (2003) https://doi.org/10.1117/12.458192
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

Based on the successful numerical weather forecasting performed by collaboration between MKWC and Subaru Telescope, we develop a temperature control system of the primary mirror of the Subaru Telescope. Temperature forecast is accurate 80% in 2 degrees. After to start the operation, the temperature of the primary mirror controlled below 1 degree centigrade compare by the ambient night air temperature in over 70% probability. The effect of the temperature control for the improvement of the seeing of Subaru telescope seems to be moderately effective.The median of the seeing size of Subaru Telescope on May 2000 to July 2002 is 0.69 arcsec FWHM. We need further investigation whether the improvement is the result of our successful temperature control system of the primary mirror, or the effect of the annual variation of seeing itself. Thus, we need a long period data for verification the effect of the temperature control.

Citation Download Citation

Akihiko Miyashita, Ryusuke Ogasawara, Naruhisa Takato, George Kosugi, Tadafumi Takata, and Fumihiro Uraguchi "Temperature control for the primary mirror and seeing statistics of Subaru Telescope", Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); https://doi.org/10.1117/12.458192

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