Okayama Astrophysical Observatory Wide Field Camera is a near-infrared (0.9-2.5 μm) survey telescope, built as a renewal of 0.91 m classical Cassegrain telescope. The optics is composed of forward Cassegrain and quasi Schmidt, which yield an effective image circle of Φ51 mm. A HAWAII-1 PACE detector is placed at the focal plane, which gives a field of view of 0.48 deg.×0.48 deg. with image scale of 1.67 arcsec/pix. OAOWFC is used to monitor the Galactic plane for variability and search for EM counterpart of gravitational wave sources.
We have built a control system for a mini survey facility dedicated to photometric monitoring of nearby bright (K<5) stars in the near-infrared region. The facility comprises a 4-m-diameter rotating dome and a small (30-mm aperture) wide-field (5 × 5 sq. deg. field of view) infrared (1.0–2.5 microns) camera on an equatorial fork mount, as well as power sources and other associated equipment. All the components other than the camera are controlled by microcomputerbased I/O boards that were developed in-house and are in many of the open-use instruments in our observatory. We present the specifications and configuration of the facility hardware, as well as the structure of its control software.
Okayama Astrophysical Observatory Wide Field Camera: OAOWFC is a near-infrared (0.9-2.5 μm) survey telescope, whose aperture is 0.91m. It works at Y, J, H, and Ks bands. The optics are consisted of forward Cassegrain and quasi Schmidt which yield the image circle of Φ 52 mm or Φ 1.3 deg at the focal plane. The overall F-ratio is F/2.51 which is one of the fastest among near infrared imagers in the world. A HAWAII-1 detector array placed at the focal plane cuts the central 0.48 deg. x 0.48 deg. with a pixel scale of 1.67 arcsec/pix. It will be used to survey the Galactic plane for variability and search for transients such as Gamma-ray burst afterglows optical counterpart of gravitational wave sources.