Abstract
Deep sky photographic survey plates are recording an increasing number of debris trails. A single trail devalues the scientific usefulness of the affected plate to some degree. While on average, each survey plate will carry a trail and over a quarter of all survey plates will carry multiple trails about half the plates remain untrailed. Concern is also rising in respect of the prospect of satellite trails which may be recorded given proposals now being made for communications systems involving the use of up to 800 separate satellites. Debris trails and satellite tracks vitiate photometric observations and, if sufficiently bright, could seriously damage sensitive photometric detectors.
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