Thursday, 19 February 2009

Tuesday, 17 February 2009

2009-02-14: Venus again

Last Saturday, shortly after the sunset, I revisited Venus again to check the performances of the set of interferntial filters made by Edmund Optics. The objective was a new checking of the atmosphere detail discrimination using the equipment described in the last post.

The following image was obtained in the visible range by means of the stacking of 85 images with the original bayer filter of the camera CCD.

In order to the reduce atmospheric dispersion, the three channels were co-resgistered to produce the following real colour image of Venus.

The next images were produced with the filters. The first one is a NIR (R:880 nm), Blue (G: 450 nm) and Near UV(B: 400 nm) false colour combination obtained stacking around 80 images to reduce seeing and noise.

The second one is a combination of two NIR bands (R: 950 nm, G:880 nm) and Blue (B:450 nm).

The quality of this image is quite impressive because the atmospheric seeing seems to be better in the NIR range than in other regions of the visible and near visible ranges.