| Telescope | MDM 1.3m |
| Date | 5/26/1997 |
| Instrument | Nellie |
| Filter | R_Dartmouth |
| Exposure Time |
100 s |
| Other | Image was automatically processed. |
Problem:During this run, an IRAF daemon was automatically processing every image. It turned out that a dead lady bug had fallen onto the R filter. This bug then moved when the filter wheel turned and ended up in another corner when this image was taken. I.e., the white feature in the top left corner is the lady bug on the image, the black feature in the top right corner is the one on the flatfield. In addition, there apparently was a dust grain on the I filter which moved as well after the flat was taken (visible just above the panner in the bottom left corner). |
Fix:The lady bug was removed and the R filter was cleaned. |
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