BUSCA (Bonn University Simultaneous CAmera)

BUSCA at the 2,2m telescope

BUSCA (Bonn University Simultaneous CAmera), is a CCD camera system which allows simultaneous direct imaging of the same sky area in four colors. BUSCA covers the wavelength range from 300 to 900 nm. 

Available at: Cassegrain focus of the Zeiss 2.2 m reflector.

Contact: This email address is being protected from spambots. You need JavaScript enabled to view it.


In a nutshell

Instrument name BUSCA
Observing technique Simultaneous imaging in four bands
FOV 12' x 12'
Dicroic cutoffs (nm)
λ < 430,            430 < λ < 540,           540 < λ < 700,          λ > 700
Min. exposure time
Available filters
Strömgren u,v,b,y, Bessell I, u, v (not simult.), Strömgren Hβ (narrow & wide)
Detectors 3 CCD485 Lockheed Martin backside + 1 CCD485 frontside  thinned (NIR)
Detector sizes 4096x4096 pix
Pixel size/scale 15 μm / 0.176"/pix
Readout time ~2 min with 2x2 binning
A&G FOV 5.6 x 4.2 arcmin


 Observing with BUSCA

Preparing observations During observations
Requesting observing time Observing manual
Instrument overview Troubleshooting
Technical characteristics  Log sheets
Exp. time calculator  Flat fields information
Bias level and readout noise  


More information


Reference articles: Link1, Link2

Busca at the University of Bonn

Image gallery

View of the instrument
Schematic diagram
M57 - The Ring Nebula in Lyra by Oliver Cordes
M87 - Virgo A elliptical galaxy in Virgo by Oliver Cordes
B33 - Horsehead Nebula in Orion by Oliver Cordes
GRB 030329 by A. de Ugarte Postigo & J. Gorosabel

Press Releases

The Dark Horse (Photo Release)