VST main characteristics

Optical configuration  Modified Ritchey Chretien 
Aperture 2610 mm
F number 5.5
Corrected field of view 1.47 degree (1° x 1°)
Image scale 0.21 arcsec/pixel
Spectral range without ADC 320 to 1014 nm
Spectral range with ADC 365 to 1014 nm
Active optics Shack Hartman wavefront sensor
M1: 84 axial + 24 lateral pads
M2: hexapod active system
Image quality 80% of PSF encircled energy
within 2 pixel diameter circle
(for zenith distance up to 50°)
Chromatic aberration on PSF 2% max
Maximum distortion 0.01%
CCD mosaic 16Kx16K
(32 CCDs 2Kx4K)
pixel size 15 micron x 15 micron
read-out time 20 s
auxiliary CCDs 4 auxiliary CCDs for guiding 
and image analysis
Filters (preliminary list) 14 Broad band:
Johnson U, B, V, R_KC, I_KC, Z
Sloan u', g', r', i', z'
EIS Uw, Rw, Iw
5 Medium band:
Deep-sky filters centered on 4880, 6720, 7125, 8180, 9149 A
10 Narrow band:
OIII (FWHM 50A) at redshifts from 0 to 3000 km/s
H_alfa (FWHM 60A) at redshifts from 0 to 6500 km/s
DDO filters 3820/320 4160/50, 4260/50, 4520/50 
Limiting magnitudes

Following the present schedule, VST will be operative in October 2002.
The foundation for the construction of the enclosure at Paranal just started in October 2000.

Send comments to Roberto Silvotti & Juan Alcalà

Last updated:7 Dec. 2000