Toyohiro Akiyama (秋山 豊寛 , Akiyama Toyohiro , born July 22, 1942) is a Japanese TV journalist best known for his flight to the Mir space station aboard a Soviet Soyuz spacecraft in 1990.
 Akiyama is the first person of Japanese nationality to have flown in space.
 He was known as the "Space Journalist" (宇宙特派員) in Japan.
Klaus-Dietrich Flade (born August 23, 1952) is a German pilot and former German Aerospace Center astronaut who visited the Mir space station in 1992 aboard the Soyuz TM-14 mission, returning to Earth a week later aboard Soyuz TM-13.
Dr. Reinhold Ewald (born December 18, 1956) is a German physicist and ESA astronaut.
Yury Viktorovich Romanenko (Russian: Ю́рий Ви́кторович Романе́нко , "Jurij Viktorovič Romanenko"; born August 1, 1944) is a former Soviet cosmonaut, twice Hero of the Soviet Union (March 16, 1978 and September 26, 1980).
 Over his career, Yury Romanenko spent a total of 430 days 20 hours 21 minutes 30 seconds in space and 18 hours in space walks.
 In 1987 he was a resident of the Mir space station, launching on Soyuz TM-2 and landing aboard Soyuz TM-3.
 He remained on Mir for 326 days that was the longest stay in space at that time.
 His son, Roman Romanenko is also a cosmonaut, and has become the third second-generation space traveler on Soyuz TMA-15 in May 2009.
Soyuz TM-30 (Russian: Союз ТМ-30 , "Union TM-30"), also known as Mir EO-28, was a Soyuz mission, the 39th and final human spaceflight to the Mir space station.
 The crew of the mission was sent by MirCorp, a privately funded company, to reactivate and repair the station.
 The crew also resupplied the station and boosted the station to an orbit with a low point (perigee) of 360 and a high point (apogee) of 378 kilometers (223 and 235 miles, respectively).
 The boost in the station's orbit, which was done by utilizing the engines of the Progress M1-1 and M1-2 spacecraft, made transit between Mir and the International Space Station impossible, as desired by NASA.
 The mission was the first privately funded mission to a space station.
Dragonfly: NASA and the Crisis Aboard Mir (ISBN  ) is a book by Bryan Burrough about the Russian Mir space station and the cosmonauts and astronauts who served aboard.
 The story centres on astronaut Jerry Linenger and the events on the Shuttle and Mir Space Programme in 1997.
Salyut 4 (DOS 4) (Russian: Салют-4 ; English translation: Salute 4) was a Salyut space station launched on December 26, 1974 into an orbit with an apogee of 355 km, a perigee of 343 km and an orbital inclination of 51.6 degrees.
 It was essentially a copy of the DOS 3, and unlike its ill-fated sibling it was a complete success.
 Three crews attempted to make stays aboard Salyut 4 (Soyuz 17 and Soyuz 18 docked; Soyuz 18a suffered a launch abort).
 The second stay was for 63 days duration, and an unmanned Soyuz capsule remained docked to the station for three months, proving the system's long-term durability despite some deterioration of the environmental system during Soyuz 18's mission.
 Salyut 4 was deorbited February 2, 1977, and re-entered the Earth's atmosphere on February 3.
Mir EP-2 was a visiting expedition to the Mir space station conducted in June 1988 by cosmonauts Anatoly Solovyev, Viktor Savinykh and Aleksandr Aleksandrov.
 Launched aboard the Soyuz TM-5 spacecraft, the crew spent ten days in space before returning to Earth aboard Soyuz TM-4.
 The mission occurred while the EO-3 crew were aboard Mir.
Franz Artur Viehböck (born August 24, 1960 in Vienna) is an Austrian electrical engineer, and was Austria's first cosmonaut.
 He was titulated "„Austronaut“" by his country's media.
 He visited the Mir space station in 1991 aboard Soyuz TM-13, returning aboard Soyuz TM-12 after spending just over a week in space.
Soyuz TMA-18M was a 2015 Soyuz spaceflight to the International Space Station.
 It provided the two twelve-months occupants (Scott Kelly and Mikhail Korniyenko) at the International Space Station with a fresh Soyuz capsule.
 TMA-18M was the 127th flight of a Soyuz spacecraft; the first having occurred in 1967.
 The ascent flight consisted of a Russian commander and two flight engineers from Denmark (ESA) and Kazakhstan respectively.
 The flight launched in September 2015 and returned to Earth in March 2016.

Question: Reinhold Ewald and Klaus-Dietrich Flade were both German astronauts; however, which one visited the Mir space station aboard a Soyuz capsule in 1992?
Answer: Klaus-Dietrich Flade