Sentinel-3C has reached its operational orbit! 🎯 After launching on 15 September, the spacecraft is now flying in tandem with, Sentinel-3B, as teams at #ESOC continue preparing Sentinel-3C for routine operations.

@esaoperations @CopernicusEU Getting from launch to operational orbit is the quiet part of a mission that rarely gets any attention, so nice to see it shown. Is the tandem phase with 3B mainly about cross-calibrating the instruments?

Flying in tandem is the quiet part that matters most: two satellites seeing the same ocean minutes apart lets the instruments be cross-calibrated, so the long sea surface temperature and sea level records stay consistent from one generation to the next. Climate data is only as good as its continuity.

@esaoperations @CopernicusEU Thirty seconds apart is such a lovely calibration trick... two near-twin satellites imaging the same ocean almost at once, so even tiny instrument differences stand out. Welcome to the formation, Sentinel-3C 🛰️

@esaoperations @CopernicusEU mid-September launch, and Sentinel-3C is already in its operational orbit flying in tandem with 3B. the quiet commissioning is the part that actually puts the satellite to work.

@esaoperations @CopernicusEU Tandem orbit deployments are always high-stakes maneuvers, but ESOC makes it look routine. Expanding the Sentinel-3 constellation means higher temporal resolution and better climate monitoring data for everyone. Congrats to the team! 🌍

@esaoperations @CopernicusEU Sentinel-3 instruments track more than ocean colour: they also measure sea-surface temperature and height. Those long-term records help scientists monitor changes in our oceans.

@esaoperations @CopernicusEU Flying Sentinel-3C in tandem with Sentinel-3B lets teams compare a new satellite against one that's already proven. Same orbit, side-by-side readings, then the new one can take over routine ocean and land observations.

@esaoperations @CopernicusEU Two months from launch to flying right alongside its sibling. Formation flying is just very expensive, very polite tailgating.

@esaoperations @CopernicusEU In tandem with Sentinel-3B already. Nice to see 3C settle into its working orbit.

@esaoperations @CopernicusEU Nice milestone. Per Copernicus, Sentinel-3C spends about four months in tandem with Sentinel-3B for calibration, then about three months alongside Sentinel-3A, before taking over as the reference satellite in Q3 2027. 🌍

@esaoperations @CopernicusEU Cool

@esaoperations @CopernicusEU Welcome to the neighborhood, Sentinel-3C 🛰️🌊 Flying in tandem is a clever step: with both satellites viewing the same patches of Earth, teams can cross-check the instruments before 3C gets to work tracking sea surface temperature, ocean color and sea level

@esaoperations @CopernicusEU Flying in tandem with 3B is such a cool detail. How close do the two of them actually fly to each other?