| Telescope | MDM 1.3m |
| Date | 11/23/97 |
| Instrument | Echelle CCD |
| Filter | R |
| Exposure Time |
400 sec |
Problem:Double images of objects are usually caused by motion of the guider. Trailed images are caused by bad guiding and guiding parameters can be adjusted to correct for this. Two distinct images may be created if the guider suddenly guides on a new position (ie the guide star shifts within the guide box and the guider guides with it there rather than shifting it back to the original location in the box, or the entire guide probe slips a fraction and pulls the telescope with it). The latter is what likely occurred here as this happened every time the telescope was positioned at an HA of about 3h (large inclination of the telescope). |
Fix:Make sure the guiding parameters are adjusted for optimal guiding, and that the guide star is correctly positioned in the guide box before starting. If the guider probe itself is loose and thus slips, have a support technician fix this. |