Russian ground-based optical telescopes observe Spectrum-RG

During the last few days Spectrum-RG spacecraft was observed by many Russian optical telescopes. These observations are needed to improve SRG orbit parameters measurements. The improved orbital solution will allow to apply more accurate orbit correction, which is planned on July 22. More accurate orbit correction will allow to save fuel aboard SRG spacecraft during its fly to the second Lagrange point (L2) of the Sun-Earth system. In future it will help to extend the mission lifetime.

These optical observations were done with Russian-Turkish 1.5-m telescope, Zeiss-1000 of Special Astrophysical Observatory of RAS, 1.6-m Sayan observatory telescope of Institute of Solar-Terrestrial Physics of SB RAS, 0.6-m telescope of Institute of Astronomy of RAS at Terskol observatory, telescopes of Crimean Astrophysical Observatory and others.

The SRG spacecraft is now located at the distance about 700 km from the Earth, in the direction of Aquila constellation and is moving to the Lagrange L2 point with the velocity around 800 m/s relative to Earth.

On-line broadcast of launch – today (July 13, 2019) from 14:30 MSK

On-line broadcast of launch:

Launch schedule

15:30:57 MSK Liftoff
15:33:01 MSK Stage I separation
15:36:29 MSK Stage II separation
15:36:42 MSK Fairing separation
15:40:41 MSK Booster separates from stage III
15:46:41 MSK First booster engine firing, to lift the payload into a transfer orbit
17:08:24 MSK Second booster engine firing, spacecraft on the way to L2
17:30:58 MSK Booster separation from the payload

Launch postponed until July 13, 2019

The state commission that oversees the launch of Proton-M carrier rocket with DM-03 booster and Spektr-RG satellite telescope decided to postpone the launch of the Spektr-RG observatory to July 13, 2019 due to issues with rocket subsystem.

Final decision about a possibility of the launch will be provided by the state commission at morning of July 13, 2019.

Source (russian) at Roscosmos official site