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Proceedings Paper

MIRA status report: recent progress of MIRA-I.2 and future plans
Author(s): Masanori Yoshizawa; Jun Nishikawa; Naoko Ohishi; Shunsaku Suzuki; Yasuo Torii; Hikaru Iwashita; Kohichi Kubo; Ko Matsuda; Naoshi Murakami; Akihisa Matsukawa; Takeshi Nishimura; Noriaki Okayasu; Sho Watanabe
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Paper Abstract

MIRA-I.2 is a 30m-baseline two-aperture stellar interferometer working in the visible band (from 600 to 1000 nm). In this article are presented the up-to-date progress and performance of MIRA-I.2 as well as some ongoing and future plans. The fast and coarse delay lines are now both evacuated, and the maximum OPD (optical path delay) compensations are about 16 m and 4 m long, respectively, for the fast and coarse delay lines. The current limiting magnitude is about I=4.5mag, and stars within the declination range from +8 to +51 degree is possible to be observed longer than one hour at the elevation angle of 60 degrees and higher. The OPD of the coarse delay line is modulated by about 128 micrometers around the expected fringe center with the use of PZT, and 187 fringe packets are scanned during one shot (= 60 seconds duration) to yield the mean visibility of about 10 % internal errors for each shot. The thermal environment of the building that houses the delay lines and interference optics has been improved very much, and readjustments of the optical alignment are not necessary for a whole night. The assembly and the setup of the optics to be used for the fringe tracking experiment are nearly completed.

Paper Details

Date Published: 23 June 2006
PDF: 8 pages
Proc. SPIE 6268, Advances in Stellar Interferometry, 626808 (23 June 2006); doi: 10.1117/12.671109
Show Author Affiliations
Masanori Yoshizawa, National Astronomical Observatory of Japan (Japan)
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
Naoko Ohishi, National Astronomical Observatory of Japan (Japan)
Shunsaku Suzuki, National Astronomical Observatory of Japan (Japan)
Yasuo Torii, National Astronomical Observatory of Japan (Japan)
Hikaru Iwashita, National Astronomical Observatory of Japan (Japan)
Kohichi Kubo, National Astronomical Observatory of Japan (Japan)
Ko Matsuda, National Astronomical Observatory of Japan (Japan)
Naoshi Murakami, National Astronomical Observatory of Japan (Japan)
Akihisa Matsukawa, Hosei Univ. (Japan)
Takeshi Nishimura, Nippon Univ. (Japan)
Noriaki Okayasu, Nippon Univ. (Japan)
Sho Watanabe, Hosei Univ. (Japan)


Published in SPIE Proceedings Vol. 6268:
Advances in Stellar Interferometry
John D. Monnier; Markus Schöller; William C. Danchi, Editor(s)

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