# STS-51-G

STS-51-G was the 18th flight of NASA's Space Shuttle program, and the fifth flight of Space Shuttle Discovery. The seven-day mission launched from Kennedy Space Center, Florida, on June 17, 1985, and landed at Edwards Air Force Base, California, on June 24, 1985. Sultan bin Salman Al Saud from Saudi Arabia was on board as a payload specialist; Al Saud became the first Arab, the first Muslim, and the first member of a royal family to fly into space. It was also the first Space Shuttle mission which flew without at least one astronaut from the pre-Shuttle era among its crew.

## Crew

| Position | Astronaut | Astronaut |
| Commander | Daniel C. Brandenstein Second spaceflight | Daniel C. Brandenstein Second spaceflight |
| Pilot | John O. Creighton First spaceflight | John O. Creighton First spaceflight |
| Mission Specialist 1 | John M. Fabian Second and last spaceflight | John M. Fabian Second and last spaceflight |
| Mission Specialist 2 Flight Engineer | Steven R. Nagel First spaceflight | Steven R. Nagel First spaceflight |
| Mission Specialist 3 | Shannon W. Lucid First spaceflight | Shannon W. Lucid First spaceflight |
| Payload Specialist 1 | Patrick Baudry, CNES Only spaceflight | Patrick Baudry, CNES Only spaceflight |
| Payload Specialist 2 | Sultan bin Salman Al Saud, RSAF Only spaceflight | Sultan bin Salman Al Saud, RSAF Only spaceflight |
| Al Saud became the first member of royalty to fly into space, as well as the first Arab and the first Muslim. |||

### Backup crew

| Position | Astronaut | Astronaut |
| Payload Specialist 1 | Jean-Loup Chrétien, CNES | Jean-Loup Chrétien, CNES |
| Payload Specialist 2 | Abdulmohsen Al-Bassam, RSAF | Abdulmohsen Al-Bassam, RSAF |

### Crew seat assignments

| Seat | Launch | Landing | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 1 | Brandenstein | Brandenstein | | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 2 | Creighton | Creighton | | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 3 | Lucid | Fabian | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 4 | Nagel | Nagel | | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 5 | Fabian | Lucid | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 6 | Baudry | Baudry | | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |
| 7 | Al Saud | Al Saud | | Seats 1–4 are on the flight deck. Seats 5–7 are on the mid-deck. |

## Mission summary

Discovery lifted off from Launch Complex 39A, Kennedy Space Center (KSC), at 7:33 a.m. EDT on June 17, 1985. The mission's crew members included Daniel C. Brandenstein, commander; John O. Creighton, pilot; Shannon W. Lucid, Steven R. Nagel, and John M. Fabian, mission specialists; and Patrick Baudry, from France, and Prince Sultan Sultan bin Salman Al Saud, from Saudi Arabia, both payload specialists.
STS-51-G carried three communications satellites as its primary cargo. These were Arabsat-1B (Arab Satellite Communications Organization); Morelos-1 (Mexico); and Telstar-303 (AT&T Corporation); all three were Hughes-built satellites. All three successfully utilized Payload Assist Module (PAM-D) booster stages to achieve geostationary transfer orbits (GTO) after being deployed from Discovery.
Also carried was the SPARTAN-1 (Shuttle Pointed Autonomous Research Tool for AstroNomy) a deployable/retrievable carrier module, designed to be deployed from the orbiter and fly free in space before being retrieved. SPARTAN-1 included 140 kg (310 lb) of astronomy experiments. It was deployed and operated successfully, independent of the orbiter, before being retrieved. Discovery furthermore carried an experimental materials-processing furnace, two French biomedical experiments (French Echocardiograph Experiment (FEE) and French Postural Experiment (FPE)), and six Getaway Special (GAS) experiments, which were all successfully performed, although the GO34 Getaway Special shut down prematurely. This mission was also the first flight test of the OEX advanced autopilot which gave the orbiter capabilities above and beyond those of the baseline system.
The mission's final payload element was a High Precision Tracking Experiment (HPTE) for the Strategic Defense Initiative (SDI) (nicknamed "Star Wars"); the HPTE failed to deploy properly during its first try on the mission's 37th orbit, because the orbiter was not at the correct attitude. It was successfully deployed on orbit 64.
Discovery landed at Edwards Air Force Base at 9:11:52 a.m. EDT on June 24, 1985, after a mission duration of 7 days, 1 hour, 38 minutes, and 52 seconds.

## Mission Insignia

The STS-51-G insignia illustrates the advances in aviation technology in the United States within a relatively short span of the twentieth century with Discovery flying over the Wright Flyer. A gold-and-orange-flame eagle forms the base of the insigna. The surnames of the crewmembers for the Discovery's mission appear near the center edge of the circular design, with the French and Saudi crewmembers added below, with a respective flag icon along their name. Although Baudry was the first French citizen to fly with a Space Shuttle mission into space, he was only the second Frenchman to go to space, following Jean-Loup Chrétien's earlier missions with Soyuz capsule, Soyuz T-6.

## Wake-up calls

NASA began a tradition of playing music to astronauts during Project Gemini, 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.
| Flight Day | Song | Artist/Composer |
| Day 2 | "Eye in the Sky (song)" | The Alan Parsons Project |
| Day 3 | "Proud Mary" | Creedence Clearwater Revival |
| Day 4 | "Sailing" | Christopher Cross |
| Day 5 | "Jonathan Livingston Seagull" | Neil Diamond |
| Day 6 | "Wedding March" | Felix Mendelssohn |

## Gallery

* Arabsat-1B deployment
* Morelos-1 deployment
* Telstar-303 deployment
* SPARTAN-1 after deployment