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The letter C with a year and code.
Also known as: Long period comet designation, C/1995 O1 style designation
The designation of a comet not known to be periodic, giving the year and half-month of its discovery.
Encodes the half-month of discovery in a letter, so the designation states when the object was found and by implication where in the year to look for the discovery report.
Contexts: History
A capital letter and stroke, a four-figure year, a capital letter for the half-month and a number.