DBp.1.23 — KMTNet: a network of 1.6-m wide field optical telescopes installed at three southern observatories

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Chung-Uk Lee1, Seung-Lee Kim1, Sang-Mok Cha1, Yongseok Lee1, Dong-Jin Kim1, Byeong-Gon Park1, Dong-Joo Lee1, Jae-Rim Koo1, Kyeongsoo Hong1, Jae Woo Lee1, Yoon-Hyun Ryu1, Beomdu Lim1, Jin-Sun Lim1, Seung-Won Gho1, Min-Jun Kim1

Institution(s): 1. Korea Astronomy and Space Science Institute

Korea Astronomy and Space Science Institute (KASI) have installed three identical 1.6-m telescopes, called Korea Microlensing Telescope Network (KMTNet), which cover 2 x 2 degree field of view with the plate scale of 0.4 arcsec/pixel at three observatories - CTIO, SSO and SAAO in southern hemisphere. The uniqueness of the system is the uninterupted 24-hour monitoring with a wide field optics in southern hemisphere. The telescope adopts prime focus using a parabolic mirror and four spherical flattening lenses. The structural design and driving systems are modified from the degin of 2MASS telescope. The one piece filter-shutter assembly has a sliding shutter and four 310-mm square filters. Each observation system produces a 680MB size image file at site and the images are transfered to KASI data center using the Global Ring Network for Advanced Application Development (GLORIAD) network with the band width of 50Mbps in average. The main science goal of the KMTNet is to discover Earth like extra solar planet using the microlensing technique during bulge season, and 50% of the total observation time is allocated for the science program solely. The other telescope times are allocated for pre-selected seven science programs during non-bulge season. From the test observation, we verify that the most important two requirements are satisfied: 10 arcsec in RMS for the pointing accuracy and 1 arcsec of delivered image quality in I-band. In this presentation, we introduce finally installed system at each observatory and its observational performance obtained from the test observation.