Real-Time Satellite Tracker & Orbit Visualizer

15,930 Active Spacecraft Tracked

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ISS (ZARYA)

Space Station #25544 1998-067A Sunlit

Calculating pass timing...

Sub-Satellite Lat / Lon 51.64° N 356.47° E

Orbital Altitude 418.4 km Low Earth Orbit (LEO)

Orbital Velocity 27,580 km/h Ground Velocity Vector

Observer Azimuth 142.3° (SE) Compass Look Angle

Observer Elevation 45.2° Above Horizon Line

Slant Range Distance 582 km Distance to Station

Mobile & Cloud Platform

Experience SkyLive Everywhere

SkyLive Web is 100% free with unlimited live satellite tracking. Enhance your astronomical observation with our iOS and Android mobile apps for Augmented Reality and Push Pass Notifications.

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AR Camera Sky View

Point your phone camera directly at the night sky. Gyroscope and compass overlay real-time satellite trajectories and visual magnitude ratings onto your camera feed.

Mobile Exclusive

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Push Pass Notifications

Receive smart push alerts 10 minutes before the International Space Station, Starlink trains, or Hubble pass over your exact ground coordinates.

Cloud Synced

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Offline SGP4 Ephemeris

Full offline orbital mechanics calculation in remote observation sites and amateur radio field stations with automatic 24-hour TLE cache fallback.

Field Ready

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Cross-Platform Sync

Sign in once with Google or Apple. Your saved ground stations, pass alarms, and favorite satellite lists synchronize seamlessly between web and mobile.

Real-Time Firestore

Engineering & Physics

Built for Precision Aerospace Tracking

Every formula, trajectory, and frequency is calculated with rigorous orbital mechanics and high-frequency edge propagation.

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SGP4 / SDP4 Propagator Engine

Official NORAD simplified general perturbations model computing gravitational harmonics (J2, J3, J4), solar radiation pressure, and atmospheric drag.

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Cloudflare Edge TLE Sync

Two-line element sets pulled and validated dynamically from our global Cloudflare worker edge network at tle.skylive.app.

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Ham Radio Doppler Compensation

Real-time radial range-rate Doppler calculations across VHF, UHF, and microwave transponders for smooth amateur radio satellite QSO tracking.

FAQ

Frequently Asked Questions

How does SkyLive calculate satellite positions?

SkyLive uses the standardized SGP4 (Simplified General Perturbations-4) orbital mechanics model implemented in JavaScript. It parses official Two-Line Element (TLE) datasets and calculates true geodetic coordinates, altitude, velocity, and ground footprint for any timestamp.

How does Cloud Sync work between Web and Mobile?

When you sign in using Google or Apple via our Firebase Auth integration, your observer ground station coordinates and favorited satellites are securely stored in Cloud Firestore and synced in real-time across your desktop browser, iPhone, iPad, and Android devices.

Can I use SkyLive for Ham Radio satellite communications?

Yes! SkyLive includes a dedicated Ham Radio Doppler Console that tracks active amateur radio satellites (such as AO-91, SO-50, RS-44, and PO-101) with live uplink/downlink frequency tuning and velocity-based Doppler shift compensation.