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A knowledge platform for everything above Earth — astronomy, space, the night sky, celestial events, mythology, and astrology as a clearly separate cultural tradition.

Astronomy is presented as scientific, evidence-based, and sourced. Astrology is presented as cultural, symbolic, and interpretive — never as proven science.

Astronomy

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Astrology

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Encyclopedia

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Guides

Beginner Astronomy
How Stars Form
How Black Holes Work
How Telescopes Work

© 2026 Asteria Star. Everything above Earth — science and tradition, kept clearly apart.

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Home
Satellites
Sentinel-3

Satellite · Earth observation · Europe

Sentinel-3

Operated by ESA.

SatellitesActiveLaunched 2016

Overview

A Copernicus mission monitoring ocean and land surface temperature, colour, and topography for climate and marine services.

Knowledge connections

OrbitSun-Synchronous Orbit (SSO)
Operated byESA

Sources

Facts on this topic will be cited from these primary and reference sources.

ESAEuropean Space Agency
European missions, observatories, and space science imagery.

Quick facts

Category: Earth observation
Operator: ESA
Country: Europe
Launched: 2016
Status: Active
Orbit: Sun-Synchronous Orbit (SSO)
Orbit class: Sun-synchronous

Observing the sky

This encyclopedia performs no live satellite tracking and states no pass times. For what is genuinely visible tonight at your location, use the computed Live Sky tools.

Tonight's observing dashboard →
Planet visibility →
Moon position & phase →

Quality & authority

25%

Unreviewed

Completeness: Complete
Source coverage: Partial
Citation coverage: None
Relationship coverage: Partial
Review coverage: None
Image coverage: None

Reused agencies, rockets, and launch sites are the platform's existing entities. Unknown values are left blank. See source quality.