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This page shows trends in the number of unique objects observed by year for Defunct Comets

Data can be specified by observatory code through the option below

Enter an observatory code below to add its data to the graphs and click the "Add" button. To remove an observatory's data, enter its observatory code and click the "Remove" button. Multiple observatories can be added, however they must be entered one at a time. Please note that some observatories may not have any applicable data. For a complete list of observatory codes, please visit the Minor Planet Center's website.

Inputs are not case-sensitive.

Add Obs. Code Remove Obs. Code