AstroAlert: Satellite Tracker

AstroAlert tells you what is passing over your head tonight: satellites like the ISS, planets, the Moon and deep-sky objects, calculated for your exact location.

Open the app, look up at the right moment. AstroAlert turns your phone into a personal space control center.

WHAT YOU CAN DO
• See today's satellite passes above you, with time, azimuth and altitude
• Follow the ISS, Starlink trains, bright satellites, planets, the Moon and the Sun
• Keep only the spectacular events, high above the horizon (altitude over 70°)
• Explore galaxies, nebulae and star clusters with official images
• Space weather: solar flares, geomagnetic storms and aurora chances, with alerts
• Watch the Solar System animate in real time
• Learn with a clear astronomy glossary and daily space facts
• Discover the NASA Astronomy Picture of the Day

HOW IT WORKS
Positions are computed from NASA JPL planetary ephemerides and official TLE orbital data for satellites, then projected onto your sky from your GPS location. No telescope needed: most passes are visible with the naked eye.

WHO IT IS FOR
Curious beginners, families, students, amateur astronomers and astrophotographers who want to know where and when to look.

ASTROALERT+ (PREMIUM)
• Automatic, personalized alerts before each pass
• 1,000+ detailed celestial object sheets
• Every deep-sky object unlocked
• Early access to new features

AstroAlert: the sky above you, explained with precision, simplicity and wonder. Get your camera ready, or simply enjoy the sky.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://astroalert.app/privacy-policy