STS-41-B was the tenth space shuttle mission, and the fourth flight for Challenger. Following STS-9, the flight numbering system for Space Shuttle missions was changed. Thus, the next flight, instead of being designated STS-11, became STS 41-B. STS-10 was cancelled due to payload delays.
Launch date: February 3, 1984 13:00:00 UTC
Landing: February 11, 1984 12:15:55 UTC