November 12, 2018

Glonass navigation satellite in orbit after Soyuz launch


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A Soyuz-2.1b rocket lifted off Saturday from the Plesetsk Cosmodrome in northern Russia. Credit: Russian Ministry of Defense

A new satellite joined Russia’s Glonass navigation fleet Saturday with a successful launch on top of a Soyuz rocket into an orbit nearly 12,000 miles above Earth.

The Glonass M navigation satellite lifted off aboard a Soyuz-2.1b rocket at 2017 GMT (4:17 p.m. EDT; 11:17 p.m. Moscow time) Saturday from the Plesetsk Cosmodrome in far northern Russia, according to the Russian Ministry of Defense.

The Soyuz launcher flew on an easterly heading from Plesetsk, a military launch base around 500 miles (800 kilometers) north of Moscow. The launch was conducted under the supervision of Russian troops.

The rocket’s four kerosene-fueled strap-on boosters jettisoned normally around two minutes into the mission, followed less than three minutes later by the separation of the Soyuz core stage. A third stage RD-0124 engine ignited to propel the Glonass M satellite and its Fregat space tug on a preliminary trajectory, and the Fregat’s main engine took over for three firings.

Around three-and-a-half hours after liftoff, the Fregat stage injected the navigation payload in a near-circular orbit at an altitude of more than 11,900 miles (19,100 kilometers) and an inclination of 64.8 degrees, according to publicly-released U.S. military tracking data.

Artist’s concept of a Glonass M navigation satellite. Credit: ISS Reshetnev

ISS Reshetnev, the Glonass M satellite’s manufacturer in Zheleznogorsk, Russia, said in a statement that the spacecraft stabilized itself in orbit after separation from the Fregat upper stage, and deployed its power-generating solar panels.

The successful launch marked the second Soyuz rocket flight since a booster failure cut short an Oct. 11 Soyuz launch carrying a Russian cosmonaut and NASA astronaut to the International Space Station. Commander Alexey Ovchinin and U.S. flight engineer Nick Hague safely landed in Kazakhstan after the rocket malfunction.

Russian investigators traced the cause of the failure to a “deformed” sensor in the separation system for the Soyuz rocket’s  four first stage boosters.

The next station crew is due for launch Dec. 3, and a series of unpiloted Soyuz launches are planned before then. A Soyuz rocket successfully launched from Plesetsk with a Russian military surveillance satellite Oct. 25, and two more Soyuz launches are scheduled this month — a launch set for Tuesday from French Guiana with a European weather satellite, and a mission Nov. 16 from the Baikonur Cosmodrome in Kazakhstan hauling a Progress freighter to the space station.

The Soyuz-2.1b rocket is pictured before launch Saturday at the Plesetsk Cosmodrome. Credit: Russian Ministry of Defense

The 3,100-pound (1,400-kilogram) Glonass M satellite launched Saturday, designated No. 57, targeted Plane 2 of the Glonass constellation. The Glonass satellites are spread in three orbital planes, or pathways, around Earth, each with eight spacecraft.

The newest member of the Glonass satellite fleet will likely replace an aging navigation craft launched in December 2006. The Glonass M-series of satellites have design lifetimes of seven years.

The Glonass network is the Russian analog to the U.S. Air Force’s Global Positioning System providing worldwide navigation and timing services. As of Monday, the Glonass fleet consisted of 24 operational satellites — the number required for global coverage — one spacecraft undergoing in-orbit maintenance, one satellite in flight testing, and the new navigation station delivered to orbit Saturday still in post-launch commissioning, according to an official Russian website listing the status of the Glonass system.

The launch Saturday was the second deployment of a Glonass satellite this year, following a previous Soyuz launch from the Plesetsk Cosmodrome in June.

The Russian Defense Ministry renamed the satellite Kosmos 2529 after the launch, keeping with the naming convention for the country’s military payloads.

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Follow Stephen Clark on Twitter: @StephenClark1.


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