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Minor Planet Center vs Unusual Units Converter

Same instrument, two spec sheets — measured, not claimed.

APIMinor Planet CenterNEW—Unusual Units ConverterNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (data derived from JPL/MPC)Unverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Minor Planet Center vs Unusual Units Converter: common questions

Which is more reliable, Minor Planet Center or Unusual Units Converter?

On our scheduled checks, Unusual Units Converter leads on measured uptime — Minor Planet Center at —% versus Unusual Units Converter at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Minor Planet Center and Unusual Units Converter need an API key?

Neither needs a paid key — Minor Planet Center is callable with no signup, and Unusual Units Converter is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Minor Planet Center and Unusual Units Converter from the browser?

Only Unusual Units Converter is browser-friendly — it returns CORS headers over HTTPS. Minor Planet Center needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Minor Planet Center and Unusual Units Converter free for commercial use?

Minor Planet Center has unclear commercial terms, and Unusual Units Converter has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.