• Title/Summary/Keyword: infrared: telescope

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FUTURE SPACE INFRARED TELESCOPE MISSION, SPICA

  • MATSUMOTO TOSHIO
    • Journal of The Korean Astronomical Society
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    • v.38 no.2
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    • pp.89-91
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    • 2005
  • SPICA (Space Infrared Telescope for Cosmology and Astrophysics) is an infrared astronomical satellite with a 3.5 m cooled telescope which is very powerful in mid- and far- infrared observations and makes complementary role to JWST and Herschel. SPICA will be launched at ambient temperature without any cryogen into the Sun-Earth L2 orbit and cooled down in space to 4.5 K with use of efficient radiative cooling and mechanical coolers. The present status of SPICA and the developments of the satellite system are reported.

CURRENT STATUS OF THE INSTRUMENTS, INSTRUMENTATION AND OPEN USE OF OKAYAMA ASTROPHYSICAL OBSERVATORY

  • YOSHIDA MICHITOSHI
    • Journal of The Korean Astronomical Society
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    • v.38 no.2
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    • pp.117-120
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    • 2005
  • Current instrumentation activities and the open user status of Okayama Astrophysical Observatory (OAO) are reviewed. There are two telescopes in operation and one telescope under reforming at OAO. The 188cm telescope is provided for open use for more than 200 nights in a year. The typical over-subscription rate of observation proposals for the 188cm telescope is ${\~}$ 1.5 - 2. The 50cm telescope is dedicated to $\gamma$-ray burst optical follow-up observation and is operated in collaboration with Tokyo Institute of Technology. The 91cm telescope will become a new very wide field near-infrared camera in two years. The high-dispersion echelle spectrograph (HIDES) is the current primary instrument for the open use of the 188cm telescope. Two new instruments, an infrared multi-purpose camera (ISLE) and an optical low-dispersion spectrograph (KOOLS), are now under development. They will be open as common use instruments in 2006.

PROTO-MODEL OF AN INFRARED WIDE-FIELD OFF-AXIS TELESCOPE

  • Kim, Sang-Hyuk;Pak, Soo-Jong;Chang, Seung-Hyuk;Kim, Geon-Hee;Yang, Sun-Choel;Kim, Myung-Sang;Lee, Sung-Ho;Lee, Han-Shin
    • Journal of The Korean Astronomical Society
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    • v.43 no.5
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    • pp.169-181
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    • 2010
  • We develop a proto-model of an off-axis reflective telescope for infrared wide-field observations based on the design of Schwarzschild-Chang type telescope. With only two mirrors, this design achieves an entrance pupil diameter of 50 mm and an effective focal length of 100 mm. We can apply this design to a mid-infrared telescope with a field of view of $8^{\circ}{\times}8^{\circ}$. In spite of the substantial advantages of off-axis telescopes in the infrared compared to refractive or on-axis reflective telescopes, it is known to be difficult to align the mirrors in off-axis systems because of their asymmetric structures. Off-axis mirrors of our telescope are manufactured at the Korea Basic Science Institute (KBSI). We analyze the fabricated mirror surfaces by fitting polynomial functions to the measured data. We accomplish alignment of this two-mirror off-axis system using a ray tracing method. A simple imaging test is performed to compare a pinhole image with a simulated prediction.

SNU Research Activities with United Kingdom Infrared Telescope

  • Im, Myeong-Sin
    • The Bulletin of The Korean Astronomical Society
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    • v.35 no.1
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    • pp.64.2-64.2
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    • 2010
  • From 2009, CEOU of Seoul National University has been utilizing the United Kingdom Infrared Telescope (UKIRT) at Mauna Kea, Hawaii, as one of its research facilities. UKIRT is a telescope with 3.8m primary mirror, and it is currently the largest telescope specialized for infrared observations. We will summarize our research activities using UKIRT, which include Infrared Medium-deep Survey (IMS) of proto-clusters and high redshift quasars, NIR imaging programs of Gamma Ray Bursts (GRBs), Gamma Ray sources, and SNUQSO quasars. Our research programs include international collaboration with the UK GRB team, the NASA/Swift team, Pomona College, and National Central University of Taiwan. We will also touch on our future plan of using UKIRT.

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Performance Analysis for Mirrors of 30 cm Cryogenic Space Infrared Telescope

  • Park, Kwi-Jong;Moon, Bong-Kon;Lee, Dae-Hee;Jeong, Woong-Seob;Nam, Uk-Won;Park, Young-Sik;Pyo, Jeong-Hyun;Han, Won-Yong
    • Journal of Astronomy and Space Sciences
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    • v.29 no.3
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    • pp.321-328
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    • 2012
  • We have designed a 30 cm cryogenic space infrared telescope for astronomical observation. The telescope is designed to observe in the wavelength range of 0.5~2.1 ${\mu}m$, when it is cooled down to 77 K. The result of the preliminary design of the support structure and support method of the mirror of a 30 cm cryogenic space infrared telescope is shown in this paper. As a Cassegrain prescription, the optical system of a 30 cm cryogenic space infrared telescope has a focal ratio of f/3.1 with a 300 mm primary mirror (M-1) and 113 mm secondary mirror (M-2). The material of the whole structure including mirrors is aluminum alloy (Al6061-T6). Flexures that can withstand random vibration were designed, and it was validated through opto-mechanical analysis that both primary and secondary mirrors, which are assembled in the support structure, meet the requirement of root mean square wavefront error < ${\lambda}/8$ for all gravity direction. Additionally, when the M-1 and flexures are assembled by bolts, the effect of thermal stress occurring from a stainless steel bolt when cooled and bolt torque on the M-1 was analyzed.

REQUIREMENTS AND FEASIBILITY STUDY OF FPC-G FINE GUIDING IN SPACE INFRARED TELESCOPE, SPICA (대형 적외선 우주망원경 SPICA/FPC-G의 정밀 별추적 요구사항과 타당성 연구)

  • Jeong, Woong-Seob;Lee, Dae-Hee;Pyo, Jeonghyun;Moon, Bongkon;Park, Sung-Joon;Ree, Chang Hee;Park, Youngsik;Han, Wonyong;Nam, Ukwon;Matsumoto, Toshio
    • Publications of The Korean Astronomical Society
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    • v.27 no.5
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    • pp.391-397
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    • 2012
  • The SPICA (SPace Infrared Telescope for Cosmology & Astrophysics) project is a next-generation infrared space telescope optimized for mid- and far-infrared observation with a cryogenically cooled 3m-class telescope. It will achieve the high resolution as well as the unprecedented sensitivity from mid to far-infrared range. The FPC (Focal Plane Camera) proposed by KASI as an international collaboration is a near-infrared instrument. The FPC-S and FPC-G are responsible for the scientific observation in the near-infrared and the fine guiding, respectively. The FPC-G will significantly reduce pointing error down to below 0.075 arcsec through the observation of guiding stars in the focal plane. We analyzed the pointing requirement from the focal plane instruments as well as the error factors affecting the pointing stability. We also obtained the expected performance in operation modes. We concluded that the FPC-G can achieve the pointing stability below 0.075 arcsec which is the requirement from the focal plane instruments.

JAPAN 8M TELESCOPE: SUBARU PROJECT

  • IYE MASANORI
    • Journal of The Korean Astronomical Society
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    • v.29 no.spc1
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    • pp.371-374
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    • 1996
  • An updated project status review of the Japan 8m telescope, Subaru, scheduled for its first light in the second quater of 1998 atop Mauna Kea is given.

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