comparison of obsevational conditions at maidanak and nyukasa toshifumi yanagisawa...
TRANSCRIPT
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
SummarySummary
Seeing (instrumental) at Maidanak
Seeing (instrumental) at Nyukasa,Japan
~ (almost the same)
AuthorsAuthors
YanagisawaYanagisawa
Kurosaki
2009 Novemberat Maidanak
AbstractAbstract
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:1. Seeings at Maidanak and at Nyukasa
turned out almost the same.2. The sky background at Maidank is about
half compared with that at Nyukasa.
Observation at MaidanakObservation at Maidanak
Date: 2009 November 17Telescope: Celestron C8 (D:200mm, F2032mm)Camera: N.I.L. 1K1KEquatorial mount: Vixen GPDExposure time: 10sec
Celestron C8
Vixen GPD
N.I.L. 1K1K
Observation at NyukasaObservation at Nyukasa
Date: 2010 May 17Telescope1: Celestron C8 (D:200mm, F2032mm)Camera1: N.I.L. 1K1KEquatorial mount: Showa 25ELExposure time: 10sec
(for reference)Telescope2: Takahashi BRC250 (D: 250mm, F1268mm)Camera2: N.I.L. 4K2.7KEquatorial mount: Showa 25ELExposure time: 10sec
Celestron C8
N.I.L. 1K1K
N.I.L. 4K2.7K
Takahashi BRC250
Showa 25EL
Nyukasa-yama observatory, JAXA, JapanNyukasa-yama observatory, JAXA, Japan
Routine observationsby JAXA about ... space debris near-Earth objects main belt asteroids others
"入笠山 "a mountain where you
always need an umbrellabecause of frequent rain
Nyukasa-yama
Comparison of instrumental seeingComparison of instrumental seeing
Instruments Maidanak Nyukasa
Celestron C8 3.30″ 3.38″
Takahashi BRC250
(1.96″) 2.01″
Sky background 100 ADU 210 ADU
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
DiscussionDiscussion
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