La Silla Seeing Statistics:

TreeLevel: La Silla Seeing Statistics, Portal

This page contains information about the seeing on La Silla Observatory (ESO, Chile) as reported by the night assistants working in the 4 biggest telescopes (ESO NTT , ESO 3.60m , ESO/MPI 2.20m , DANISH 1.54m) and by the Seeing Monitor (DIMM2) which operates in fully automated mode.

The data is obtained through a gaussian fits along the X and Y axis on stars selected from a CCD frame. The raw data is corrected to get the seeing value at zenith and at 0.5 micron using the following formulae:

  seeing(0.5u,zenith)= seeing(measured)*(lambda(Angs.)/5000)^-0.2/airmass^0.6
  
  This mean that a set of homogeneus data is obtained and can be plotted.

All Seeing, as obtained by DIMM2.(main telescopes overplotted)

Seeing 1999 (gif)
Seeing 1995 (gif) ,Seeing 1996 (gif) ,Seeing 1997 (gif) ,Seeing 1998 (gif)
Early Years (gif), 1991(data), 1992(data), 1993(data), 1994(data)

Main Telescopes(Monthly data,since 1995)

ESO NTT , ESO 3.60 , ESO/MPI 2.20 , DANISH 1.54

DIMM2(Monthly data,since 1995)

DIMM2 data

Monthly Statistics (DIMM2)

1991 , 1992 , 1993 , 1994 , 1995 , 1996 , 1997 , 1998 , 1999

To see the Real Time access to La Silla DIMM Seeing Data click here

To see the new La Silla-MeteoMonitor click here

If you want to see a specif night of seeing data (DIMM2) click here

This page maintained by Julio Navarrete, ESO/La Silla, jnavarre@eso.org

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