NASA Astronaut Group 13 (the Hairballs) was a group of 23 astronauts announced by NASA on 17 January 1990.

[1] The group name came from its selection of a black cat as a mascot, to play against the traditional unlucky connotations of the number 13.

[2] This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.