Check the listing for details. NASA Space Shuttle Challenger STS-51B Mission Patch Spacelab 3. Condition: Used. Listed at 8.50 USD. NASA Space Shuttle Challenger STS-51B Mission Patch Patch is approximately 4" x 4.75". STS-51-B was the 17th flight of the NASA Space Shuttle program and the seventh flight of Space Shuttle Challenger. The launch of Challenger on April 29, 1985, was delayed by 2 minutes and 18 seconds, due to a launch processing failure. Challenger was initially rolled out to the pad to launch on the STS-51-E mission. The shuttle was rolled back when a timing issue emerged with the TDRS-B satellite. When STS-51-E was canceled, Challenger was remanifested with the STS-51-B payloads. The shuttle landed successfully on May 6, 1985, after a week-long mission. The mission insignia features the Challenger with her payload doors open, to show the onboard Spacelab 3. The orbiter rides over the American flag. The seven crewmembers are represented by the 7 stars on the patch, that indirectly refer to the Mercury Seven as a nod to their legacy. Behind the orbiter, the contours of Pegasus can be seen, as a reference to the European Space Agency (ESA). The white board surrounding it all has the appearance of a space suit helmet, with the names of the two respective teams grouped around them on a round band encircling the insignia, and the two mission specialists on an added section below. To further create some sort of contrast, the team colors are reprised for each member's name. Thank you for looking at my listing. Please check out my other listings for more space patches and other items.