Instrumentation Overview

The Telescope


  • Diameter: 10 m
  • Beam size (FWHM): 22 arcsec at 350 GHz, 17 arcsec at 492 GHz
  • Main beam efficiency: 60% at 350 GHz, 45% at 492 GHz

The main beam efficiency may vary with respect to the environmental conditions like ambient temperature and solar radiation. It is recommended to observe standard sources and/or planets every night or a few times during an observing run to measure the main beam efficiency by observers.

Pointing Accuracy and Strategy

  • A typical accuracy of ~2 arcsec (rms) will be achieved by cross scan observations of planets (continuum observations of Jupiter or Saturn) or five-point observations of a compact CO source (spectroscopy observations of late-type stars).
  • Here is the list of pointing sources
  • It is appropriate to conduct pointing calibration every ~2 hours during night.
  • The pointing accuracy above is achievable for wind velocity of less than 10 m/s. It can be significantly degraded if wind velocity exceeds 15 m/s.
  • Definition of the azimuth direction: AZ = 0 deg for north, 90 deg for east, EL = 90 deg for zenith.