HEASARC: The Launch of SRG

The image above shows the launch of Spectrum-Roentgen-Gamma from the Baikonur Cosmodrome in the Republic of Kazakhstan on July 13, 2019. Spectrum-Roentgen-Gamma (also called Spektr-RG, or SRG for short) is a Russian-German space observatory (with contributions from NASA), which will explore the entire high-energy X-ray Universe. The primary instrument on SRG is the “extended ROentgen Survey with an Imaging Telescope Array” telescope, better known as eROSITA. eROSITA will perform an unprecedented, 4-year long survey of the entire X-ray sky, greatly improving upon the only prior imaging all-sky X-ray survey, obtained by the German-US-UK ROSAT observatory in the early 1990s. The eROSITA survey will be obtained over a 5-times wider X-ray energy band, extending from 0.2 keV up to 10 keV, and to a much higher sensitivity than achieved by the ROSAT All-Sky Survey. The Astronomical Roentgen Telescope – X-ray Concentrator (or ART-XC) on SRG will expand the energy range of SRG to even higher energies, up 30 kilo-electron volts. One of the primary goals of SRG is to detect tens of thousands of distant galaxy clusters to determine the large scale structure in the Universe and test our understanding of the mysterious dark energy which drives the Universe apart. SRG will observe the Universe from a parking orbit at the Sun-Earth L2 point, a region of gravitational stability about a million miles behind Earth along the Sun-Earth axis. SRG will execute its 4-year all-sky survey by orbiting around the Sun-Earth axis every 4 hours. After this survey, SRG will spend 3 years taking detailed observations of individual celestial objects including galaxy clusters, active galactic nuclei, stars, neutron stars and black holes.

Published: July 15, 2019

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

Roscosmos: Pre-launch tests at Baikonur

Roscosmos and space industry specialists perform pre-launch tests of the Proton-M vehicle with the Spectr-RG observatory at the Baikonur cosmodrome.  In particular, a cycle of planned tests and additional checks of all the launch vehicle systems, the DM-03 upper stage and the observatory are carried out.

However, during the final phase of the ground tests, an issue on the launch missile was revealed, which required additional time to eliminate.

Source: Roscosmos


RIA Novosti reported that the issue with discharged battery has been resolved

The RIA Novosti news agency reported, that the discharged KhIT battery, which had required to postpone the launch of the Spektr-RG observatory to a backup date on July 12, was replaced by specialists at the Baikonur cosmodrome.

“The chemical current source has been replaced. The re-erect of the rocket to the launch pad is planned on July 8. The launch is scheduled on July 12 at 15.31 Moscow time,” said the agency source.