STS-41

STS-41 was the eleventh mission of the Space Shuttle Discovery. The four-day mission with a primary objective to launch the Ulysses probe as part of the "International Solar Polar Mission".

Crew

Crew seating arrangements

Mission highlights

Discovery lifted off on 6 October 1990 at 7:47:15 am EDT. Liftoff occurred 12 minutes after a two-and-a-half-hour launch window opened that day at 7:35 am EDT. STS-41 featured the heaviest payload to date; Discovery weighed 259,593 lb (117.749 Mg) .

The primary payload was the ESA-built Ulysses spacecraft to explore the polar regions of Sun. Attached to Ulysses were two upper stages, the Inertial Upper Stage (IUS) and a mission-specific Payload Assist Module-S (PAM-S), combined together for first time to send Ulysses toward an out-of-ecliptic trajectory. Other payloads and experiments included the Shuttle Solar Backscatter Ultraviolet (SSBUV) experiment, INTELSAT Solar Array Coupon (ISAC), Chromosome and Plant Cell Division Experiment (CHROMEX), Voice Command System (VCS), Solid Surface Combustion Experiment (SSCE), Investigations into Polymer Membrane Processing (IPMP), Physiological Systems Experiment (PSE), Radiation Monitoring Experiment III (RME III), Shuttle Student Involvement Program (SSIP) and Air Force Maui Optical Site (AMOS).

STS-41 (disambiguation)

NASA flew a number of Space Shuttle missions in the early and mid-1980s with designations derived from STS-41.

The ambiguity was the result of a NASA decision to change designation of missions starting in Fiscal Year 1984. Previously, missions were designated in the order they were flown (i.e., STS-9 indicated the ninth shuttle mission). The new designation was designed to accommodate a dramatically increased launch manifest, address the addition of a west coast launch site and to resolve confusion from manifested missions not being flown in order due to delays. The new designation used a three-part designator following the term "STS". The first number represents the fiscal year of the launch, the second represents the launch location (1=Florida, 2=California) and the alphanumeric code represents the order launched (i.e., A is first, B is second, etc.). Therefore, the first mission using this designation, which was the tenth shuttle mission was STS 41B. It launched in FY 1984, from Florida and was the first to launch in that year.

STS-41-D

STS-41-D was the 12th flight of NASA's Space Shuttle program, and the first mission of Space Shuttle Discovery. It was launched from Kennedy Space Center, Florida, on 30 August 1984, and landed at Edwards Air Force Base, California, on 5 September. Three commercial communications satellites were deployed into orbit during the six-day mission, and a number of scientific experiments were conducted.

The mission was delayed by more than two months from its original planned launch date, having experienced the Space Shuttle program's first launch abort at T-6 seconds on 26 June 1984.

Crew

Crew seat assignments

Mission background

The launch was originally planned for 25 June 1984, but because of a variety of technical problems, including rollback to the Vehicle Assembly Building to replace a faulty main engine, the launch was delayed by over two months. The 26 June launch attempt marked the first time since Gemini 6A that a manned spacecraft had experienced a shutdown of its engines just prior to launch.