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  • Site

    • Longitude: 292d16m E

    • Latitude: -22d59m N

    • Altitude: 5640 m

    • Time zone: CLT (UTC-4) or CLST (UTC-3)

    • Seeing: 0.69 arcsec in V-band in median

    • Precipitable water vapor: 0.3 mm in the 10 percentile, 0.5 mm in median

  • Optics

    • Primary mirror: a monolithic 6500-mm diameter concave mirror

    • Secondary mirror: a monolithic 897-mm diameter convex mirror

    • Effective diameter of the primary mirror: 6153.6 mm

    • Effective focal length: 75074 mm

    • Focal ratio: F/12.2

    • Plate scale: 2.75 arcsec/mm

    • Focus: 2 Nasmyth and 2 bent-Cassegrain foci

    • Pupil position: at the secondary mirror

    • Image quality (80% encircled energy diameter): 0.39 arcsec

  • Drive system

    • Mount: an altazimuth system

    • Range of movement: 22-89 degrees for altitude, 360 degrees (+-270 degrees) for azimuth

    • Maximum rotation speed: 2 degrees per second for altitude and azimuth

    • Pointing accuracy: 2 arcsec in RMS

    • Tracking accuracy: 0.2 arcsec in RMS radius for 10 minutes in open tracking at the wind speed of less than 15 m/s

    • Required time in tertiary mirror rotation: about 2 minutes in a 180-degree rotation

Auxiliary Component

  • Instrument Rotator

    • rotates observational instruments and auxiliary components for canceling out the rotation of the field of view

    • one rotator for each Nasmyth focus

    • Components: an instrument, a Shack-Hartmann wavefront sensor, and an auto guider camera

    • Maximum rotation speed: 3 degrees per second

  • Shack-Hartmann wavefront sensor

    • always activates during the observations to detect errors in the primary mirror shape

    • Limiting magnitude for guide stars: 16.0 mag in V-band for NICE and SWIMS, or 14.2 mag in I-band for MIMIZUKU

  • Auto Guider Camera

    • for correcting the telescope tracking errors

    • non-mandatory in observations if the tracking error is acceptable

    • Field of view: 16.6 x 12.2 arcsec for NICE and SWIMS, and 41 x 55 arcsec MIMIZUKU

    • Movable area: 10 arcmin radius from the telescope optical axis

    • Limiting magnitude for NICE and SWIMS: 16.0 mag, 15.2 mag, and 14.5 mag in V-, R-, and I-band, respectively, in a 10-second exposure

    • Limiting magnitude for MIMZUKU: 14.5 mag in I-band in a 10-second exposure at 0.6 arcsec seeing

    • Tracking accuracy with feedback: 0.15 times seeing

Instruments

 

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