shashwatak/satellite-js
Modular set of functions for SGP4 and SDP4 propagation of TLE and OMM. observed · 2026-08-28
Health v2 · maintenance only
93/100
- Activity 98
- Release rhythm 82
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 76
- age_days: 4861
- days_rel: 41
- days_push: 13
- n_releases_24m: 6
Adoption not part of the score
1082 stars · 172 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
A TypeScript/JavaScript library implementing SGP4 and SDP4 orbital propagation from TLE and OMM data, usable in web and Node.js environments. It also provides coordinate transforms and utilities like doppler factor and shadow (eclipse) calculations.
Use cases
- propagate satellite positions from TLE lines in javascript
- track ISS position in a web app
- compute look angles and geodetic position for ground stations
- convert OMM JSON orbit data to a satellite record
- calculate doppler shift for satellite pass predictions
- determine if a satellite is in Earth's shadow
When to choose
- you need SGP4/SDP4 propagation in JavaScript or TypeScript
- you're building a satellite tracking or pass prediction web application
- you need coordinate transforms (ECI, geodetic) alongside propagation
When to avoid
- you need high-precision ephemeris beyond SGP4/SDP4 accuracy
- you're working in Python or another non-JS language
- you need full mission-analysis astrodynamics suites
Facets
library · maturity active
simulation math sdk simulation astronomy developer-tools browser cross-platform sgp4 sdp4 tle omm satellite-propagation orbital-mechanics space coordinate-transforms doppler nodejs typescript
1 source
- readme: https://github.com/shashwatak/satellite-js · fetched 2026-08-28 · 558a4506b7fe
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| shashwatak/satellite-js | main | 93 |
For agents
markdown · JSON · MCP: product_card(name="shashwatak/satellite-js")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem