The number of the asteroid named after Gregor Mendel is 3313. Its formal designation is (3313) Mendel, following the convention of placing an asteroid’s identifying number before its name.
The asteroid was discovered on 19 February 1980 by Czech astronomer Antonín Mrkos at the Kleť Observatory near Český Krumlov. It was initially recorded under the provisional designation 1980 DG. The International Astronomical Union approved the name Mendel in 1994 to honor the Austrian monk and geneticist whose pea experiments founded modern genetics.
(3313) Mendel is a main-belt asteroid and is associated with the Eunomia family, a large group named after asteroid 15 Eunomia. It travels around the Sun on an orbit with a period of roughly 4.3 years.
The number is easy to confuse with nearby asteroid designations such as 3312 or 3314, but those are different objects. Mendel’s name also appears elsewhere in space: both a lunar crater and a Martian crater are named after him.