23 June 2006 The DIMM station at Subaru Telescope
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Abstract
To get the strategy to confirm image qualities of Subaru Telescope, we have obtained the statistics of seeing measured with auto guider images obtained during scientific observations. In addition to this, we started a regular operation of a stationary DIMM at the Subaru Telescope site. From the data of natural seeing measured with the DIMM, we expect to reveal contributions of telescope vibration, inadequate enclosure ventilation, or optical aberrations including deformation of primary mirror by wind load. The stationary DIMM station consists of one 30 cm diameter DIMM, its enclosure, the local control unit and Linux based control PC. We put our DIMM station at the catwalk of the Subaru enclosure at the level of 12-m from the ground, because the high location from the ground can minimize the influence of ground layer. We describe details of our DIMM station and show seeing data obtained since June 2005 and comparison with the seeing obtained with Subaru auto guider images in order to check whether the enclosure of Subaru Telescope may affect the DIMM to measure the seeing.
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Fumihiro Uraguchi, Naruhisa Takato, Akihiko Miyashita, Tomonori Usuda, "The DIMM station at Subaru Telescope", Proc. SPIE 6267, Ground-based and Airborne Telescopes, 62670N (23 June 2006); doi: 10.1117/12.671798; https://doi.org/10.1117/12.671798
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