A Russian Soyuz rocket lifts off May 29 carrying a Glonass navigation satellite. Credit: Video grab

A Soyuz rocket successfully launched a Glonass navigation satellite Sunday despite an “irregularity” with its upper stage.

The Soyuz-2.1b rocket lifted off from the Plesetsk Cosmodrome at 4:45 a.m. Eastern Sunday and placed the Glonass satellite into its planned orbit.

However, Russian officials said an unspecified issue took place with the Fregat upper stage, requiring it to burn longer than planned to inject Glonass into its planed orbit.

They provided no additional details about the problem and whether it would affect upcoming Soyuz launches. [TASS]

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Jeff Foust writes about space policy, commercial space, and related topics for SpaceNews. He earned a Ph.D. in planetary sciences from the Massachusetts Institute of Technology and a bachelor’s degree with honors in geophysics and planetary science...