Sentinel-3C is the third satellite in the Sentinel-3 constellation, which provides high-accuracy optical, radar and altimetry data for marine and land services. The Fluorescence Explorer (FLEX) satellite is a part of ESA's Earth Explorer program. The satellite will map vegetation fluorescence to quantify photosynthetic activity.

| Full name | Vega-C |
| Family | Vega |
| Name | Vega-C |
| Variant | — |
| Length | 34.8 m |
| Maiden flight | 2022 |
| Name | Avio S.p.A |
| Country | ITA |
| Founded | 1908 |