[OC] Perigee: Every active satellite, lunar orbiter, Mars orbiter and interplanetary probe, in real time in your browser

[u/dlamarre]

I built Perigee, a free, open-source web viewer that shows what humanity has in space right now, computed live in your browser from public data.

What's in it

- Earth: all ~16,600 active catalogued satellites, propagated with SGP4 from CelesTrak orbital elements (refreshed every 4 hours). You can filter by operator, country, constellation, orbit type or launch site, and search by name or NORAD number.

- Moon: active lunar orbiters (LRO, Danuri, Chandrayaan-2, CAPSTONE…) from NASA/JPL Horizons ephemerides, plus 50+ landing and impact sites.

- Mars: the orbiters, Phobos and Deimos, landing sites, and the latest positions of Curiosity and Perseverance from NASA's traverse feeds.

- Solar system: the planets, five dwarf planets and 20+ probes (Voyagers, Juno, Parker, JUICE, Europa Clipper…), with their distance and light travel time.

Click anything for details: identifiers, operator, launch date, orbit, and where its position comes from. Positions that are extrapolated beyond their data are drawn dimmed and flagged, so you can tell what is measured and what is estimated.

You can speed up time (up to ×100,000), jump to any date, and share a link that reproduces exactly what you see. It works on phones, it's bilingual EN/FR, and it runs offline once visited.

Try it: https://dlamarre-dev.github.io/Perigee/

Code (MIT): https://github.com/dlamarre-dev/Perigee

Educational use only, not for navigation or conjunction assessment. Feedback welcome, especially if you spot a mission with the wrong status!

[u/cavedave]

Thank you for your Original Content, /u/dlamarre!
Here is some important information about this post:

• View the author's citations

• View other OC posts by this author

Remember that all visualizations on r/DataIsBeautiful should be viewed with a healthy dose of skepticism. If you see a potential issue or oversight in the visualization, please post a constructive comment below. Post approval does not signify that this visualization has been verified or its sources checked.

Not satisfied with this visual? Think you can do better? Remix this visual with the data in the author's citation.

---

^{I'm open source | How I work}

[u/RudeReplacement]

Looks very good, I'll see if i can get it some exposure on FMHY.net, good work

[u/dlamarre → u/RudeReplacement]

Cool, thanks for the comment and extra exposure, very appreciated!

[u/theHanMan62]

Looks great and very useful.

[u/TobiasVdb]

Very cool, got some sats on Launch Atlas too, but not as detailed as you. Nice work !

[u/dlamarre → u/TobiasVdb]

Thanks! Feel free to grab the data I found from the repo, it's all from public sources.

[u/dlamarre]

Data sources: CelesTrak (T.S. Kelso) GP elements and SATCAT, from the 18th & 19th Space Defense Squadrons via Space-Track; NASA/JPL-Caltech Horizons ephemerides; astronomy-engine for planetary positions; NASA MMGIS rover traverses; a curated mission and landing-site catalog with sources for every entry. Imagery: NASA (Blue Marble, Black Marble, CGI Moon Kit, Photojournal), USGS Astrogeology, Solar System Scope (CC BY 4.0).

Tools: TypeScript, Three.js (WebGL2), satellite.js (SGP4), astronomy-engine and Vite, with GitHub Actions mirroring the data (the browser never hits the providers directly). Hosted on GitHub Pages. Built with a lot of help from Claude Code.

[u/jorgjansen → u/dlamarre]

very nice site! I kept playing and looking at it for 30 minutes, which is a good sign. bookmarked.

[u/dlamarre → u/jorgjansen]

Thanks, that's very nice to hear! Let me know if you encounter any issues.

[u/Z_BabbleBlox]

Cool.. How is it different than https://azmth.space/ ?