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Proceedings Paper

MIRA-I.2: recent progress
Author(s): Jun Nishikawa; Masanori Yoshizawa; Naoko Ohishi; Shunsaku Suzuki; Yasuo Torii; Ko Matsuda; Koichi Kubo; Hikaru Iwashita; Takuya Yokoi; Takayuki Kotani; Koichi Sato
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Paper Abstract

After the first fringe detection with MIRA-I.2 30m baseline for Vega in June 2002, fringes for Vega and Deneb has been confirmed and then construction continued. Fast delay line has been evacuated and extended from 4m to 8m long. Coarse delay line has been extended from 2m to 4m. Baseline vector has been determined with 0.1mm accuracy. Aluminized mirrors have been changed to gold-plated ones, and the total throughput has become four times larger than before at the 600nm-1000nm band. The photon rate is 150 per ms for a 2 mag (I-band) star and the present limiting magnitude is better than 3mag. A delay modulation PZT has been set to push a cat's eye retro-reflector. Observations have been made for 6 stars with successful fringe packet detections. Visibility stability has been being studied with artificial light sources and Vega, which preliminary results are better than a few percent. A three-color system between 600-1000nm is now on the half way of installation. Gregorian cat's eye retro-reflectors with fine delay line PZTs and fringe tracking control software is planned to be installed.

Paper Details

Date Published: 20 October 2004
PDF: 8 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.550385
Show Author Affiliations
Jun Nishikawa, National Astronomical Observatory of Japan (Japan)
Masanori Yoshizawa, 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)
Ko Matsuda, National Astronomical Observatory of Japan (Japan)
Koichi Kubo, National Astronomical Observatory of Japan (Japan)
Hikaru Iwashita, National Astronomical Observatory of Japan (Japan)
Takuya Yokoi, National Astronomical Observatory of Japan (Japan)
Hosei Univ. (Japan)
Takayuki Kotani, Observatoire de Paris (France)
Univ. of Tokyo (Japan)
Koichi Sato, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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