The Russian space industry suffered another malfunction Saturday when the upper stage of the heavy-lift Proton rocket failed to perform the full duration of its final boost-burn, leaving a domestic telecommunications satellite in a lower-than-planned orbit at the end of a 9-hour flight from the Baikonur Cosmodrome.
Launch of the Yamal 402 spacecraft occurred at the precise moment of 1313:43 GMT (8:13:43 a.m. EST) atop the Proton M/Breeze M vehicle combination en route to geosynchronous transfer orbit.
The launch came just after sunset in temperatures just above the freezing mark, but the rocket rapidly disappeared into a low cloud deck within a few seconds of flight.
It was supposed to take 9 hours and 15 minutes to reach the ascent's completion, releasing the 9,839-pound satellite into an highly elliptical orbit expected to range from 4,642 miles at perigee to 22,181 miles at apogee and inclined 9 degrees to the equator.
Getting there began with the six main engines of the 191-foot-tall rocket blasting at liftoff to send the four-stage vehicle in the skies of Kazakhstan.
The lower three stages that comprised the Proton core vehicle sequentially fired through the initial 10 minutes of flight, leaving the Breeze M upper stage to step through four burns over the next several hours to achieve a preliminary parking orbit before heading into intermediate orbits to hit the geosynchronous transfer orbit.
Overseeing the mission was International Launch Services, the commercial marketer of Proton flights. ILS reported that the first three burns by the upper stage and jettison of the donut-shaped auxiliary fuel tank on the Breeze M had been performed, presumably putting the vehicle into a 317-mile by 22,147-mile orbit inclined 48 degrees to the equator within four hours of liftoff.
The rocket would then coast away from Earth for nearly five hours until the Breeze M would re-start its engine for a fourth and final burn of the day, raising the orbit's low point from 317 miles to 4,642 miles and bringing the inclination down from 48 degrees to 9 degrees relative to the equator where it ultimately would be stationed.
But instead of delivering nearly 9 minutes of propulsion as planned, the burn lasted several minutes short of that, leaving the satellite in the "off-nominal" orbit, according to a statement released by Proton rocket-builder Khrunichev.
International Launch Services did not issue a statement by press time. A company spokesperson did not respond to questions Saturday night.
Yamal 402 was supposed to maneuver itself into a circular geosynchronous orbit 22,300 miles up and lowering inclination where it can match Earth's rotation and appear parked over the equator at 55 degrees East longitude to begin a 15-year service life.
Whether the spacecraft has enough fuel to overcome the rocket problem and still have a sufficient reserve for its 15-year mission life was not immediately known Saturday.