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The launch of Space Shuttle Columbia on the STS-61-C mission, 12 January 1986.
|Mission type||Satellite deployment
|Mission duration||6 days, 2 hours, 3 minutes, 51 seconds|
|Distance travelled||4,069,481 kilometres (2,528,658 mi)|
|Spacecraft||Space Shuttle Columbia|
|Launch mass||116,121 kilograms (256,000 lb)|
|Landing mass||95,325 kilograms (210,160 lb)|
|Payload mass||14,724 kilograms (32,460 lb)|
|Members||Robert L. Gibson
Charles F. Bolden
George D. Nelson
Steven A. Hawley
Franklin R. Chang-Diaz
Clarence W. "Bill" Nelson
Robert J. Cenker
|Start of mission|
|Launch date||12 January 1986, 11:55:00UTC|
|Launch site||Kennedy LC-39A|
|End of mission|
|Landing date||18 January 1986, 13:58:51UTC|
|Perigee||331 kilometres (206 mi)|
|Apogee||338 kilometres (210 mi)|
Back row L–R: Bill Nelson, Hawley, George Nelson,
STS-61-C was the twenty-fourth mission of NASA's Space Shuttle program, and the seventh mission of Space Shuttle Columbia. It was the first time that Columbia, the first operational orbiter to be constructed, had flown since STS-9. The mission launched from Florida's Kennedy Space Center on 12 January 1986, and landed six days later on 18 January. STS-61-C's seven-person crew included the second African-American shuttle pilot, future NASA Administrator Charles Bolden, the first Costa Rican-born astronaut, Franklin Chang-Diaz, and the second sitting politician to fly in space, Representative Bill Nelson (D-FL). It was the last shuttle mission before the Space Shuttle Challenger disaster, which occurred just ten days after STS-61-C's landing.
|Commander||Robert L. Gibson
|Pilot||Charles F. Bolden
|Mission Specialist 1||George D. Nelson
|Mission Specialist 2||Steven A. Hawley
|Mission Specialist 3||Franklin R. Chang-Diaz
|Payload Specialist 1||Clarence W. "Bill" Nelson
U.S. Representative (D-FL), now Senator
|Payload Specialist 2||Robert J. Cenker
Backup crew 
|Payload Specialist 2||Gerard E. Magilton
Mission background 
STS-61-C saw Columbia return to flight for the first time since the STS-9 mission in November 1983, after having undergone major modifications over the course of 18 months by Rockwell International in California. Most notable of these modifications was the addition of the SILTS (Shuttle Infrared Leeside Temperature Sensing) pod atop Columbia's vertical stabilizer, which used an infrared camera to observe reentry heating on the shuttle's left wing and part of its fuselage. The camera was only used for one more mission after STS-61-C, but the pod remained on Columbia for the remainder of its operational life. Smaller and more discrete modifications were also added at various points throughout the shuttle.
The launch was originally scheduled for 18 December 1985, but the closeout of an aft orbiter compartment was delayed, and the mission was rescheduled for the following day. However, on 19 December, the countdown was stopped at T-14 seconds due to an out-of-tolerance turbine reading on the right SRB's hydraulic system.
Another launch attempt, on 6 January 1986, was terminated at T-31 seconds because of a problem in a valve in the liquid oxygen system. The countdown was recycled to T-20 minutes for a second launch attempt on the same day, but was held at T-9 minutes, and then scrubbed as the launch window expired. Another attempt was made on 7 January, but was scrubbed because of bad weather at contingency landing sites at Dakar, Senegal, and Morón, Spain; yet another attempt, on 9 January, was delayed because of a problem with a main engine prevalve, and on 10 January, heavy rainfall in the launch area led to another scrub.
Mission summary 
Columbia launched successfully from Kennedy Space Center at 6:55 am EST on 12 January 1986. There were no significant anomalies reported during the launch.
The primary objective of the mission was to deploy the Satcom K1 communications satellite, second in a planned series of geosynchronous satellites owned and operated by RCA Americom; the deployment was successful. Columbia also carried a large number of small scientific experiments, including 13 Getaway Special (GAS) canisters devoted to investigations involving the effect of microgravity on materials processing, seed germination, chemical reactions, egg hatching, astronomy, atmospheric physics, and an experiment designed by Ellery Kurtz and Howard Wishnow of Vertical Horizons to determine the effects of the space environment on fine arts materials and original oil paintings. Also carried was a Materials Science Laboratory-2 structure for experiments involving liquid bubble suspension by sound waves, melting and resolidification of metallic samples and container-less melting and solidification of electrically conductive specimens. Another small experiment carrier located in the payload bay was the Hitchiker G-1 (HHG-1), which carried three experiments to study film particles in the orbiter environment, test a new heat transfer system and determine the effects of contamination and atomic oxygen on ultraviolet optics materials, respectively. There were also four in-cabin experiments, three of them part of the Shuttle Student Involvement Program.
Additionally, the shuttle carried an experiment called the Comet Halley Active Monitoring Program (CHAMP), consisting of a 35 mm camera intended to photograph Halley's Comet through the aft flight deck overhead window. This experiment proved unsuccessful because of battery problems.
STS-61-C encountered problems returning to Earth. It was originally scheduled to land on 17 January, but this was brought forward by one day because the delays of STS-61-C were causing the next flight, STS-51-L, to be delayed. However, the landing attempt on 16 January was cancelled because of unfavorable weather at Edwards Air Force Base. Continued bad weather forced another wave-off the following day. The flight was extended one more day to provide for a landing opportunity at Kennedy Space Center on 18 January – this was in order to avoid time lost in an Edwards AFB landing and turnaround. However, bad weather at the KSC landing site resulted in yet another wave-off.
Columbia finally landed at Edwards AFB at 5:59 am PST, on 18 January. The mission lasted a total of 6 days, 2 hours, 3 minutes, and 51 seconds. STS-61-C was the last successful Space Shuttle flight before the Challenger disaster, which occurred on 28 January 1986, only 10 days after Columbia's return.
Wake-up calls 
NASA began a tradition of playing music to astronauts during the Gemini program, and first used music to wake up a flight crew during Apollo 15. Each track is specially chosen, often by the astronauts' families, and usually has a special meaning to an individual member of the crew, or is applicable to their daily activities.
|Day 2||"Liberty Bell March"||John Philip Sousa|
|Day 3||"Heart of Gold"||Neil Young|
|Day 4||"Stars and Stripes Forever"||John Philip Sousa|
Gag photo 
During the same session as the official crew photo, the NASA photographer took a gag photo of the STS-61-C crew with their heads and faces obscured by their helmets and visors.
See also 
- List of human spaceflights chronologically
- List of space shuttle missions
- Space Shuttle Columbia disaster