• 제목/요약/키워드: Astronomical research

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Transparency Measurement of the Night Sky in Mongolia

  • 백기선;정병준;김상혁;박수종;임명신
    • 천문학회보
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    • 제37권1호
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    • pp.70.2-70.2
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    • 2012

  • The night sky in Mongolia is known to be one of the darkest and clearest in Asia. The seasonal dust winds from the Gobi desert, however, might degrade the transparency of the night sky and affect the photometrical quality for astronomical research. In this poster, we present the preliminary results of the first transparency measurement of the night sky in Monglia. The observations are done at Zuunmod located at 25 km south from Ulaanbaatar in 2011 October 26-31. We used a CCD camera (QSI 583s) attached to an 80 mm aperture refractor telescope (William Optics Zentih Star 80 II ED APO). A new supernova, SN2011fe, and a young stellar object, HBC 722, were monitored in order to measure the extinction coefficients. These values in Mongolia are compared with those in other astronomical observatory.

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Performance evaluation of the 76 cm telescope at Kyung Hee Astronomical Observatory (KHAO)

  • Ji, Tae-Geun;Han, Jimin;Ahn, Hojae;Lee, Sumin;Kim, Dohoon;Kim, Kyung Tae;Im, Myungshin;Pak, Soojong
    • 천문학회보
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    • 제46권1호
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    • pp.49.3-49.3
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    • 2021

  • The 76 cm telescope in Kyung Hee Astronomical Observatory is participating in the small telescope network of the SomangNet project, which started in 2020. Since the installation of the telescope in 1992, the system configuration has been changed several times. The optical system of this telescope has a Ritchey-Chrétien configuration with 76 cm in diameter and the focal ratio is f/7. The mount is a single fork equatorial type and its control system is operated by TheSkyX software. We use a science camera with a 4k × 4k CCD and standard Johnson-Cousins UBVRI filters, which cover a field of view of 23.7 × 23.7 arcmin. We are also developing the Kyung Hee Automatic Observing Software for the 76 cm telescope (KAOS76) for efficient operations. In this work, we present the standard star calibration results, the current status of the system, and the expected science capabilities.

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A Study Based on Na $D_2$ Profiles in Sunspots

  • Yun, Hong-Sik
    • 천문학회지
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    • 제3권1호
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    • pp.1-5
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    • 1970

  • The earlier findings on the radiative heating through the umbral walls in large sunspots are further investigated. No significant evidence for the umbra! heating has been found in small-sized sunspot umbrae.

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