(Adds valuation estimates, organising banks, company description in paragraphs 3-7)

* This content was produced in Russia, where the law restricts coverage of Russian military operations in Ukraine.

MOSCOW, Oct 3 (Reuters) - Russian technology company Astra plans to open the books for an initial public offering (IPO) on the Moscow Exchange on Thursday, two financial market sources told Reuters, with trading due to start on Oct. 13.

Astra's listing, which is expected to result in a free float of about 5%, could breathe some life into Russia's moribund equity capital markets, which have been starved of deals since Moscow sent its troops into Ukraine in February 2022, prompting sanctions and the departure of Western bankers and lawyers.

Alfa Bank analysts valued Astra, which more than doubled its core earnings year on year to 5.4 billion roubles in 2022, at around 70 billion-90 billion roubles ($712 million-$915 million) in a report published on Monday.

Gazprombank analysts estimated the company's value at 100 billion-160 billion roubles.

Sberbank, Gazprombank, Alfa Bank and Start Capital were chosen as organisers of the offering, said the sources, who asked not to be named because the information is private.

Astra Group declined to comment.

Astra dominates Russia's operating system (OS) market with its Astra Linux software. It offers a range of software solutions to Russian government entities and state companies, including those in critical infrastructure, many of which were deprived of access to Western technology after Russia started what it calls its "special military operation" in Ukraine.

($1 = 98.3250 roubles) (Reporting by Olga Popova and Gleb Stolyarov; Writing by Alexander Marrow; Editing by Mark Trevelyan)