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28 September 2004 Simultaneous seeing measurements at Atacama
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Abstract
Institute of Astronomy, University of Tokyo is now planning to build a 6.5-m optical-infrared telescope in Atacama, Chile. This project is called "Univ. Tokyo Atacama Observatory (TAO)", and the site evaluation is now under way. As a part of this evaluation process, we started an investigation to compare the astronomical seeing at Atacama with that at Mauna Kea. Here, we report preliminary results of seeing measurements at several sites in Atacama, carried out on October 2003. In order to separate the temporal and site-to-site variation of the seeing, we used two sets of Differential Image Motion Monitors (DIMMs), each of which has two pairs of 7.4 cm sub-apertures with 20.5 cm separation. Three sites were investigated; the point near the TAO weather station (4,950m), the summit of Cello Chico (5,150m) and the point at 5,430m altitude on Cello Toco. Simultaneous measurements were carried out for three half nights out of four half nights measurements. Although the amount of our data is very limited, the results suggest following: 1) Seeing becomes better and more stable as time passing to midnight (eg. From 0."7 to 0."4 at V-band). 2) Higher altitude sites show better seeing than lower altitude sites.
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Fumihiro Uraguchi, Kentaro Motohara, Mamoru Doi, Naruhisa Takato, Akihiko Miyashita, Toshihiko Tanabe, Shinki Oyabu, and Takao Soyano "Simultaneous seeing measurements at Atacama", Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); https://doi.org/10.1117/12.552495
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