Launch from the Baikonur Cosmodrome.
ISS Expedition
48 /
49. Landing 155 km
southeast of Dzheskasgan.
Following a two-days solo flight
Soyuz MS docked to
ISS on July 09, 2016. Anatoli
Ivanishin, Takuya
Onishi and Kathleen
Rubins became the
ISS
Expedition 48
(together with
ISS
Expedition 47 crew
members Aleksei
Ovchinin, Oleg
Skripochka and Jeffrey
Williams). With the arrival
Expedition 48 became a
six-person-crew.
During their two-day transit from the launch pad at the
Baikonur Cosmodrome in Kazakhstan to the station, the crew tested a variety of
upgraded systems on their
Soyuz MS spacecraft. The modified
Soyuz is equipped with upgraded thrusters that are
fully redundant, additional micrometeoroid debris shielding, redundant
electrical motors for the
Soyuz' docking probe and increased power with more
photovoltaic cells on the spacecraft's solar arrays.
The
Soyuz spacecraft is composed of three elements
attached end-to-end - the Orbital Module, the Descent Module and the
Instrumentation/Propulsion Module. The crew occupied the central element, the
Descent Module. The other two modules are jettisoned prior to re-entry. They
burn up in the atmosphere, so only the Descent Module returned to Earth.
The
deorbit burn lasted 278 seconds. Having shed two-thirds of its mass, the
Soyuz reached Entry Interface - a point 400,000 feet
(121.9 kilometers) above the Earth, where friction due to the thickening
atmosphere began to heat its outer surfaces. With only 23 minutes left before
it lands on the grassy plains of central Asia, attention in the module turned
to slowing its rate of descent.
Eight minutes later, the spacecraft was
streaking through the sky at a rate of 755 feet (230 meters) per second. Before
it touched down, its speed slowed to only 5 feet (1.5 meter) per second, and it
lands at an even lower speed than that. Several onboard features ensure that
the vehicle and crew land safely and in relative comfort.
Four parachutes,
deployed 15 minutes before landing, dramatically slowed the vehicle's rate of
descent. Two pilot parachutes were the first to be released, and a drogue chute
attached to the second one followed immediately after. The drogue, measuring 24
square meters (258 square feet) in area, slowed the rate of descent from 755
feet (230 meters) per second to 262 feet (80 meters) per second.
The main
parachute was the last to emerge. It is the largest chute, with a surface area
of 10,764 square feet (1,000 square meters). Its harnesses shifted the
vehicle's attitude to a 30-degree angle relative to the ground, dissipating
heat, and then shifted it again to a straight vertical descent prior to
landing.
The main chute slowed the
Soyuz to a descent rate of only 24 feet (7.3 meters)
per second, which is still too fast for a comfortable landing. One second
before touchdown, two sets of three small engines on the bottom of the vehicle
fired, slowing the vehicle to soften the landing.