The Asiago Faint Object Spectrograph and Camera (AFOSC) is a focal reducer type spectrograph/camera twin of DFOSC, the instrument installed at Danish 1.54 m telescope at la Silla. It is installed at the Cassegrain focus of the 182 cm telescope. This enables imaging, spectroscopy, a resolution accuracy of 240 up to 3600, and polarimetry, to be performed.

The instrument is now equipped with a new CCD (technical details of the new chip are given here which turned out to be very similar, in terms of QE and physical dimensions to the previous CCD used with AFOSC.

AFOSC technical data

  • Collimator focal length 234.27 mm

  • Collimator Linear Field 52.9 X 52.9 mm2

  • Beam Diameter 27.4 mm

  • Camera Focal Length 159.35 mm

  • Camera Linear Field 24.58X 24.58 mm2

  • Reduction Ratio 0.68

  • Input f-number f/8.97

  • Output f-number F/6.10

  • Input scale 12.64”/mm

  • Output scale 18.59”/mm

  • Field of view 8.85’ × 8.85'

  • CCD Pixel scale 0.26”/pixel

  • Wavelength Coverage 330 - 1100 nm

  • Limiting Spectral Resolution 7350

AFOSC user manual (pdf file)

Extinction curve for Ekar (txt file)

AFOSC atlas comparision spectra (pdf file)