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arcsecond.io

Astronomical object data from a single endpoint

🔭 Science & SpaceUNMONITORED
AUTH NONECORS ✓AGENT ?HTTPS ✓COMMERCIAL ?

Arcsecond.io consolidates astronomy data sources behind one API, resolving object names to coordinates, aliases, and catalog cross-references. Ask for m1 and it returns the Crab Nebula's equatorial position and a stack of alternate designations. Keyless for basic object lookups.

—HOW IT'S SCORED ⓘ
▶ Run liveDocs ↗
Status badge · for your READMEshipapis health badge: — · unmonitored
ON PROBE SCHEDULE

We probe a documented GET and expect 2xx JSON — full uptime and health score. Open provider docs ↗

Uptime historystarts after first probe

On our probe schedule. Uptime charts appear after the first check lands.

Example responsefrom provider docs — not verified by us
GET https://api.arcsecond.io/objects/m1/

{
  "name": "m1",
  "source": "Simbad",
  "equatorial_coordinates": {
    "right_ascension": 83.6324,
    "declination": 22.0174,
    "epoch": 2451545
  },
  "aliases": [
    {
      "name": "4FGL J0534.5+2201i"
    }
  ]
}
Call itcurl · fetch · python
curl "https://api.arcsecond.io/objects/m1/"
const res = await fetch("https://api.arcsecond.io/objects/m1/");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://api.arcsecond.io/objects/m1/")
print(res.json())
Endpoints · 5On scheduleFULL DOCS ↗
On schedule — GET /objects/m1/ awaits first probe
GET/objects/m1/PROBED

Astronomical object data from a single endpoint

GET/objects

Objects — documented GET route.

GET/objects/1

Objects details by ID (example: 1).

GET/objects?limit=10

Objects — documented GET route.

GET/objects/search?q=test

Search by query parameters.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Not tracked yet. Shape-change history starts once this API joins our probe schedule.

arcsecond.io: common questions

Is arcsecond.io free to use?

Yes — arcsecond.io is a free science & space API. Free tier: Free — limits not published. Whether the free tier allows commercial use is unclear — check the provider docs.

Does arcsecond.io need an API key?

No — arcsecond.io needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).

Can I call arcsecond.io from the browser?

Yes — arcsecond.io returns CORS headers over HTTPS, so front-end code can fetch it directly with no backend proxy. Use the fetch snippet on this page, or hit "Run live" to try it now.

Is arcsecond.io up right now?

arcsecond.io is catalogued but not yet on our probe schedule, so we don't publish a live status for it. Check the provider's own status page or docs for its current state.