Final two satellites for the constellation of the Russian space weather monitoring system called "Ionozond". The constellation consists of four spacecraft; the first two were launched in November 2024 from Vostochny Cosmodrome. Possible additional cargo of microsatellites.

The launch date is currently targeted for June 17, 2025 (UTC).

On launch day, check back here to watch the live stream! (if available)

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Provider	Roscosmos
Vehicle	Soyuz-2
Location	Site 1S Vostochny Cosmodrome Russia
All dates and times should be submitted in UTC timezone. Use Estimated Date if you don't know the official launch date and time; otherwise, use Window Opens/Closes and/or Planned T-0, which will override the Estimated Date.
— Estimated Date —
Date
— Window Opens —
Date
Time
Launch Date	June 17, 2025
Launch Time
— Planned T-0 —
Date	June 17, 2025
Time
— Window Closes —
Date	June 17, 2025
Time

Earth Observation Satellite

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Ionosfera-M n° 3 & 4

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