[ ESO ] La Silla

Science Operation Department
SofI : Son of ISAAC


SofI is the infrared spectrograph and imaging camera on the NTT. Its largest field of view is 4.92 arcmin, and it covers the 0.9-2.5 micron wavelength range with spectral resolution from 600 to 2200.

Built by:
P.I.: A. Moorwood
Instrument Scientists: Julia Scharwächter and
Alessandro Ederoclite
System Engineer: Javier Valenzuela
Instrument Friend: Manuel Pizarro
Location: NTT, Nasmyth A
Publication reference: Moorwood, A., Cuby, J.G., Lidman, C. 1998, The Messenger 91, 9
Previous Intrument Scientists

Valentin D. Ivanov (until June 2007)
Cédric Foellmi (2nd IS, until Apr 2006)
Malvina Billeres (until Apr 2004),
Leonoardo Vanzi (until Sep 2002),
Chris Lidman (Golden Age),
Jean-Grabriel Cuby (Good Old Times)

SofI Status

(for previous updates click here):
  • There was a successful SofI intervention to fix a vacuum leak in mid-April. The instrument is back in good condition. (Apr 2007)
  • The small field and large field + focal elongator modes are decommissioned because of a persistent collimator problem; it is not planned to recommission them for now. (Feb 2007)
  • New imaging templates AutoJitterRot and JitterRot are available starting P80; they allow to rotate the instrument between the exposures. (Feb 2007)
  • FastPhotometry mode is available starting P80, only in Visitor Mode; it allows to carry out imaging observations with high time resolution, as high as 10-20 milisec, windowing the detector array down to 20-30 sq. pixels; contact the SofI instrument scientist for details. (Feb 2007)


(for previous updates click here):

Please mail to ls-sofi for comments, suggestions and to report errors and inaccurate statements in the web pages and manuals.

Instrument Characteristics

Observing and Data Reduction
SoFI Press Releases

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