JASMINE is a Japanese planned space mission that aims to reveal the formation history of our Galaxy and discover habitable exoEarths. For these objectives, the JASMINE satellite performs high-precision astrometric observations of the Galactic bulge and high-precision transit monitoring of M-dwarfs in the near-infrared (1.0—1.6 µm in wavelength). For feasibility studies, we develop an image simulation software named JASMINE-imagesim, which produces realistic observation images. This software takes into account various factors such as the optical point spread function (PSF), telescope jitter caused by the satellite’s attitude control error (ACE), detector flat patterns, exposure timing differences between detector pixels, and various noise factors. As an example, we report a simulation for the feasibility study of astrometric observations using JASMINE-imagesim. The simulation confirms that the required position measurement accuracy of 4 milliarcseconds for a single exposure of 12.5-mag objects is achievable if the telescope pointing jitter uniformly dilutes the PSF across all stars in the field of view. On the other hand, the simulation also demonstrates that the combination of realistic pointing jitter and exposure timing differences in the detector can significantly degrade accuracy and prevent achieving the requirement. This means that certain countermeasures against this issue must be developed. This result implies that this kind of simulation is important for mission planning and advanced developments to realize more realistic simulations help us to identify critical issues and also devise effective solutions.
Low-loss and high damage threshold mirrors are needed for laser interferometer-type gravitational-wave detectors.
Collaborative development with Japanese company of SIGMA KOKI CO., LTD., National astronomical
observatory of Japan and Institute for Laser Science, University of Electro-Communications was made for this
purpose. As a result, high reflectivity mirror of 99.99% for 1064nm has both low-scattering loss of less than
10ppm and high-damage threshold of over 400 J/cm2. Such mirrors can be applied for high finesse cavity of
more than 10000 with high laser input power of over 10 Watts. The mirror will offer great benefit for various
precise measurements with high power lasers.
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