BUSCA image of Horsehead Nebula
This image is a RGB composition produced by
the combination of the four images obtained simultaneosly with an exposure
of 300 seconds by Oliver Cordes .
The filters used are Stromgren u,b,y and Cousins I.
The scaling between the different filters is arbitrary.
The original image size is 2Kx2K because
the 4Kx4K CCDs 15 µ were readed out with binning 2x2. Field of view
is 12x12 arcminutes.