About Temwasseo Free Satellite Control
space.temwasseo.com is a Korean space portal for checking “what is happening in space right now” in numbers and in 3D. It computes today’s positions of planets and comets, the satellites passing over your head, active typhoons and solar activity from public data, and explains how anyone can receive satellite signals at home.
Last updated: 2026-10-17
What it shows
- 3D Solar System and named comets — real positions for today’s date computed from JPL orbital elements and the VSOP87 planetary theory (distances are on a compressed scale). The simulation date can be scrubbed back and forth.
- Earth, satellites and typhoons — satellite positions propagated with SGP4 from CelesTrak elements (TLE), live typhoon tracks from JMA and NHC, and NOAA SWPC space weather (Kp index, solar wind).
- Free satellite reception guides — how to receive Meteor-M N2-4 (137.9 MHz), GK-2A (1692.14 MHz) and the ISS (145.800 MHz), and what to do after the 2025 NOAA APT retirement.
- Encyclopedia — 25 entries on planets, comets, satellites and exoplanets with observing tips, history and FAQ (full text in Korean, summaries in other languages).
- Sky & Impact Lab — tonight’s planet altitudes, satellite pass predictions for your location, and an asteroid close-approach simulator.
Where the data comes from
Every live figure is fetched by the Site’s server from public sources, cached, and then sent to the page. No made-up fallback values are used — when data cannot be fetched, the page says “no data”.
- NASA JPL — small-body orbital elements (SBDB) and close-approach data (CAD)
- CelesTrak — satellite orbital elements (refreshed every 2 hours)
- NOAA SWPC — Kp index, solar wind, X-ray flux
- Japan Meteorological Agency (JMA) and US NHC — active typhoons and hurricanes
- MET Norway — sunrise and sunset (CC BY 4.0)
- Libraries — astronomy-engine (VSOP87 planetary positions), satellite.js (SGP4 propagation)
Our commitment to accuracy
Figures on screen are computed values, not official bulletins. For typhoons and disasters follow your national weather service; for satellite passes trust what you see in the sky. Comet brightness forecasts differ between sources, so we give ranges. If you find an error, tell us by e-mail and we will check and fix it.
Operation
The Site is run by an individual and has no membership. Operating costs are planned to be covered by advertising (Google AdSense). Sister sites by the same operator: temwasseo.com (blog) and game.temwasseo.com (web games).
Contact
Bug reports, data corrections and partnership enquiries are received by e-mail.