The
Proton (Прото́н)
rocket (formal designation:
UR-500, also known as
D-1/
D-1e or
SL-12/
SL-13) is a
Russian unmanned space vehicle design, first launched in
1965. It is still in use as of
2015 for both commercial and government launches. This makes it one of the most successful heavy boosters in the history of spaceflight. All Protons launch from
Baikonur Cosmodrome in
Kazakhstan.
The name "Proton" originates from a series of large scientific satellites, which were among the rocket's first payloads. The enormous capacity of the new rocket allowed the heavy materials used in particle detectors. Thus the Proton satellites were pioneers of high-energy astronomy. Like many Soviet boosters, the name of the recurring payloads became associated with their launchers.
Payloads can be fitted with either a Blok D or Briz-M upper stage. Launch capacity to low Earth orbit is about 22 tonnes (44,000 lbm). Interplanetary transfer capacity is about 5–6 tonnes (11,000–13,000 lbm).
Sergei Konstantinovich Krikalyov (
Russian: Сергей Константинович Крикалёв, born August 27, 1958) is a
Russian cosmonaut and
mechanical engineer. As a prominent
rocket scientist, he has been veteran of six space flights and currently has spent more time in space than any other human being. He transliterates his name in English as
Sergei Krikalev.
On August 16, 2005 at 1:44 a.m. EDT he passed the record of 748 days held by Sergei Avdeyev. He now has spent a total of 803 days and 9 hours and 39 minutes in space.
Krikalev was born in Leningrad (now St. Petersburg), Russia. He enjoys swimming, skiing, cycling, aerobatic flying, and amateur radio operations, particularly from space (callsigns U5MIR and X75M1K).
On February 15, 2007, Krikalev was appointed Vice President of the S.P. Korolev Rocket and Space Corporation Energia (Russian: Ракетно-космическая корпорация "Энергия" им. С.П.Королева) in charge of manned space flights.
Krikalev was dubbed by many "the last Citizen of the USSR " as in 1991–1992 he spent 311 days, 20 hours and 1 minute aboard the Mir space station while, back on Earth, the Soviet Union collapsed. A fictional account of how Krikalev may have felt about this is described in the song "Casiopea", written by Cuban songwriter Silvio Rodríguez.