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Comparison of Obsevational Conditions at Maidanak and Nyukasa

Comparison of Obsevational Conditions at Maidanak and Nyukasa. Toshifumi Yanagisawa （柳沢俊史） Hirohisa Kurosaki （黒崎裕久） JAXA, Japan presented by Takashi Ito ( 伊藤孝士 ), NAOJ. Summary. Seeing (instrumental) at Maidanak. ~. (almost the same). Seeing (instrumental) at Nyukasa, Japan.

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Comparison of Obsevational Conditions at Maidanak and Nyukasa

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  1. Comparison of Obsevational Conditions at Maidanak and Nyukasa Toshifumi Yanagisawa （柳沢俊史） Hirohisa Kurosaki （黒崎裕久） JAXA, Japan presented by Takashi Ito (伊藤孝士), NAOJ

  2. Summary Seeing (instrumental) at Maidanak ~ (almost the same) Seeing (instrumental) at Nyukasa, Japan

  3. Authors 2009 November at Maidanak Yanagisawa Kurosaki

  4. Abstract • In order to check the observational condition at Maidanak, we measured and compared the instrumental seeing and the sky background at Maidanak and Nyukasa, Japan, using the same instrument. • Our results are as follows: • Seeings at Maidanak and at Nyukasa turned out almost the same. • The sky background at Maidank is about half compared with that at Nyukasa.

  5. Observation at Maidanak Date: 2009 November 17 Telescope: Celestron C8 (D:200mm, F2032mm) Camera: N.I.L. 1K1K Equatorial mount: Vixen GPD Exposure time: 10sec Celestron C8 N.I.L. 1K1K Vixen GPD

  6. Observation at Nyukasa Date: 2010 May 17 Telescope1: Celestron C8 (D:200mm, F2032mm) Camera1: N.I.L. 1K1K Equatorial mount: Showa 25EL Exposure time: 10sec (for reference) Telescope2: Takahashi BRC250 (D: 250mm, F1268mm) Camera2: N.I.L. 4K2.7K Equatorial mount: Showa 25EL Exposure time: 10sec Celestron C8 Takahashi BRC250 N.I.L. 1K1K N.I.L. 4K2.7K Showa 25EL

  7. Nyukasa-yama observatory, JAXA, Japan Nyukasa-yama "入笠山" a mountain where you always need an umbrella because of frequent rain Routine observations by JAXA about ... • space debris • near-Earth objects • main belt asteroids • others

  8. Comparison of instrumental seeing • Pick up seven objects near the center of frames • Measure their FWHM through IRAF • Record the central (fourth) values • Average the values over the frames of the day Sky background 100 ADU 210 ADU

  9. Discussion Seeing at Maidanak is not supposed to be better than Nyukasa ? • Telescope conditions were slightly different • At Nyukasa, the telescope was set in a dome • At Maidanak, the telescope was set out of the dome • Their Equatorial mounts were different (see the photos) ... We will set up exactly the same condition at Nyukasa, and again measure the seeing soon

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