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AstroAlert

AstroAlert

Know exactly when satellites pass above you.

Website astroalert.app
Overview

What it is

AstroAlert is your personal sky-watch assistant. It tells you exactly which satellites, planets, comets, and deep-sky objects will pass right above your location in the next 24 hours — including spectacular zenith events above 70°. Powered by NASA/JPL data, it combines real-time calculations with educational content, a full astronomy glossary, and detailed object sheets. The sky above you, revealed with precision.

Intent

I need it when

Get timely notifications for remarkable astronomical events visible from my location

AstroAlert+ unlocks automatic alerts for remarkable sky events, notifying users at the perfect moment to observe. This eliminates the need to manually check the sky or research upcoming events.

Discover and observe satellites and celestial objects visible from my location without manual research

AstroAlert automatically calculates which satellites, planets, and deep-sky objects are passing above the user's location using latitude, longitude, and timezone. It filters to show only objects rising above 70° altitude, ensuring only impressive sky events are highlighted. Users receive automatic alerts at the optimal viewing moment.

Track Starlink and other satellite constellations to see them with the naked eye

AstroAlert monitors 1,000+ satellites including Starlink constellations with fresh orbital data updated daily. Users receive notifications when these spacecraft pass overhead at optimal viewing angles, enabling naked-eye observation with context about each satellite's purpose.

Learn detailed scientific information about celestial objects I observe

AstroAlert+ provides over 1,000 celestial objects with full technical sheets, official NASA images, scientific data, historical context, and educational explanations. This transforms casual observation into learning opportunities about the universe.

Turn my smartphone into a personal space observation control center

AstroAlert combines real-time satellite tracking, planetary positions, deep-sky object catalogs, and automatic alerts in a single mobile app. Users gain a comprehensive view of their personal sky with scientific accuracy using official NASA ephemerides.

Drop

Not a fit when

  • User has no interest in astronomy, satellites, or sky observation
  • User requires desktop-only software without mobile app capability
  • User needs real-time tracking of specific satellites for professional/military purposes requiring specialized APIs
  • User is located in regions where the app's location-based services are unavailable or restricted
  • User seeks comprehensive astrophotography planning tools beyond basic object identification and alerts
Commercials

Pricing

Freemium model with AstroAlert+ premium tier offering detailed celestial object sheets, automatic alerts, and early access to new features