Task: Question Generation
Input (English): Context : American astronomer Adriaan van Maanen, Van Maanen 2 was the third white dwarf identified, after 40 Eridani B and Sirius B, and the first that was not a member of a multi-star system. 
Subject : Van Maanen 2 
Relation : constellation
Output (English): Which constellation is Van Maanen 2 in?