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Observational Conditions in Maidanak and Nyukasa: A Comparative Study by Toshifumi Yanagisawa and Hirohisa Kurosaki, JAX

This study compares the observational conditions at Maidanak and Nyukasa, Japan, focusing on instrumental seeing and sky background. Results show similar seeing but different sky backgrounds. Observations made in 2009 at Maidanak and 2010 at Nyukasa were conducted using various instruments and parameters. The study discusses the differences in telescope conditions between the two locations and outlines plans for future measurements to enhance comparability.

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Observational Conditions in Maidanak and Nyukasa: A Comparative Study by Toshifumi Yanagisawa and Hirohisa Kurosaki, JAX

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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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