Russian megaconstellation launches as Isar prepares a second flight.

A Soyuz launch placed 16 Rassvet satellites into low orbit for Bureau 1440, and Isar Aerospace aborted a Spectrum test launch from Norway after an unauthorized boat entered the hazard area.

Several notable launches and program changes were reported this week in the Rocket Report. A Soyuz rocket deployed the first set of Rassvet satellites for a new Russian low-orbit network. Isar Aerospace halted a Spectrum test launch from Norway after an unauthorized vessel entered the danger area. NASA also announced a plan to repurpose Gateway hardware for a nuclear-electric propulsion demonstration named SR-1 Freedom. Key developments: - A Soyuz launch from Plesetsk delivered 16 Rassvet satellites into low-altitude orbit, each about 370 kilograms, for Bureau 1440, a Moscow-based enterprise backed by state funding. - The Rassvet launch was conducted with an unusual level of secrecy and did not receive a routine post-flight statement from Russian space agencies. - Isar Aerospace aborted its Spectrum launch late in the countdown at Andøya Rocket Range after an unauthorized boat violated the designated danger area; the countdown reset exceeded the launch window and the company is determining a new attempt time. - Spectrum is a two-stage small launcher designed to carry up to about 1 metric ton to low Earth orbit; a prior test flight last year ended in failure shortly after liftoff. - NASA announced Space Reactor-1, also called SR-1 Freedom, a planned nuclear-electric demonstration mission that will repurpose Gateway hardware and is slated to launch before the end of 2028, according to agency statements. Summary: The week brought both operational activity and program-level shifts: Russia launched the first satellites for a planned megaconstellation, a European small-launch provider postponed a second test attempt, and NASA outlined a nuclear-electric demonstration using Gateway-derived hardware. Follow-up actions include Isar setting a new launch date and continued deployment planning by Bureau 1440; SR-1 Freedom is scheduled for launch before the end of 2028 per the announcement.