* Astronomy

L minus 10 minutes

L minus 30 minutes

A SIRIUS 4 satellite atop a Proton Breeze M booster provided by International Launch Services Proton rocket with a Breeze M upper stage is to launch for satellite operators SES SIRIUS, on November 17th at 23:39 CET (22:40 GMT, 17:40 EST), from Launch Pad 39 at the Baikonur Cosmodrome, Kazakhstan.
The SIRIUS 4 spacecraft, features a 52 Ku-band transponder, and a 2-transponder Ka-band payload for operation at NSAB's geosynchronous orbital position of 5 degrees East.
The satellite will have an operational lifetime of 15 years.

The Proton launch vehicle will use a 4-burn Breeze M mission design to inject the satellite into a geosynchronous transfer orbit. The first three stages of the Proton will use a standard ascent trajectory to place the Breeze M fourth stage, with the satellite, into a suborbital trajectory, from which the Breeze M will place itself and the spacecraft into a circular parking orbit of 173 km inclined at 51.5 degrees. Once the upper stage and SIRIUS 4 are in the parking orbit, the unit will then be propelled into its transfer orbit by a series of additional burns of the Breeze M. Following separation from the Breeze M, the spacecraft will perform a series of liquid apogee burns to raise perigee, lower inclination, and circularise the orbit at the geostationary altitude of 35,786 km.

Target Orbit at Separation: Apogee: 35,786 km; Perigee: 7,030 km; Inclination: 17.3 degrees
Spacecraft Separation: Approximately 9 hours, 13 minutes after liftoff

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