Monthly Archives: June 2013

The end of peak oil


Oil (probably from the last days of the old compressor) was removed from the dewar window by Don Walter at the end of May. This has eliminated the curious-looking ‘coffee stain’ present on recent images.

The above unreduced image of Zw229-015 gives a fair idea of current image quality.


Current resolution with 2×2 binning (0.58 arcsec/pixel) is shown in this image of Eps Boo taken through the U filter. Separation is 2.85 arcsec.