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2s.io Asteroid & Comet Sky Position Observer
x402
2s.io Asteroid & Comet Sky Position Observer is a paid API for AI agents from 2s.io, paid per call via x402, $0.00288/call, status unknown (last checked 2026-09-15).
Compute the current or future sky position, brightness, and visibility of any asteroid or comet from a given observer location and time
Price / call$0.00288
Success—
StatusUnknown
How this service works
Compute where any asteroid or comet is in the sky and whether you can see it. Give a body (designation/number/name, e.g. "433 Eros", "Ceres", "2024 YR4") and optionally your lat/lon and a time (ISO, default now). Returns the body's identity (NEO/PHA flags, orbit class, absolute magnitude H), its geocentric right ascension + declination, the constellation it's in, geocentric + heliocentric distance (AU), solar phase angle, and its apparent visual magnitude (IAU H-G model — how bright it appears now). With lat/lon it adds altitude/azimuth, whether it's above your horizon, a visible-now flag (up AND sky dark), and the best viewing window in the next 24 hours (when it's highest during darkness). Orbital position is computed locally from JPL elements — VALIDATED against JPL Horizons to <0.1 arcminute. Stargazing, astrophotography planning, occultation/observation prep. For the body's static physical + orbital params see /api/space/body.
Output
Returns the asteroid/comet's identity (NEO/PHA flags, orbit class, absolute magnitude H), geocentric right ascension and declination, constellation, geocentric and heliocentric distances in AU, solar phase angle, apparent visual magnitude computed via the IAU H-G model. With lat/lon also returns altitude, azimuth, whether it is currently above the horizon, a visible-now flag (above horizon AND sky dark), and the optimal 24-hour viewing window (highest elevation during darkness).
Example use cases
Example prompt
“Where is asteroid 433 Eros in the sky right now, and can I see it tonight from my backyard at latitude 40.7, longitude -74.0? Also tell me when the best viewing window is in the next 24 hours.”
Technical details
Endpoint
GEThttps://2s.io/api/space/observeWhen to prefer
Use this endpoint when you need to know the real-time or future sky position and observability of a specific asteroid or comet. It is purpose-built for small solar-system bodies (asteroids, comets, NEOs, PHAs) with observer-specific alt/az and visibility windows — not for planets, stars, or deep-sky objects. Prefer this over general planetarium APIs when you need JPL-validated orbital accuracy to <0.1 arcminute, apparent magnitude from the IAU H-G model, and 24-hour viewing window optimization for astrophotography planning.
Side effects
- Unrecognized or misspelled body designation — returns error with no orbital data
- Body designation is valid but no JPL elements available — returns not-found error
- Invalid lat/lon range (lat outside ±90, lon outside ±180) — returns validation error
- Invalid ISO datetime format for 'at' parameter — returns parse error
- Body exists but is below detection threshold or has no magnitude data — magnitude may be absent
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"at": "2024-01-15T20:00:00Z",
"lat": 40.7,
"lon": -74,
"body": "433 Eros",
"altKm": 0
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"at": "2024-01-15T20:00:00.000Z",
"body": {
"neo": true,
"pha": false,
"fullName": "433 Eros (A898 PA)",
"orbitClass": "Amor",
"absoluteMagnitudeH": 10.4
},
"observer": {
"azimuthDeg": 164.49,
"visibleNow": false,
"altitudeDeg": 54.06,
"bestViewing": {
"at": "2024-01-15T22:30:00.000Z",
"altitudeDeg": 46.74
},
"aboveHorizon": true
},
"position": {
"constellation": "Pisces",
"phaseAngleDeg": 36.79,
"declinationDeg": 5.6848,
"apparentMagnitude": 13.24,
"rightAscensionHours": 23.3232,
"geocentricDistanceAu": 1.6352,
"heliocentricDistanceAu": 1.4012
}
}
],
"total": 1,
"source": {
"url": "https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html",
"license": "Public-domain elements (NASA/JPL-Caltech); position computed locally (MIT astronomy-engine).",
"provider": "NASA JPL Small-Body Database (orbital elements) + computed ephemeris (astronomy-engine)"
}
},
"meta": {
"cost": {
"usd": 0.00288,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "space.observe",
"settlement": {
"txHash": "0x7859e77aa5263bc5141275d3985938452cb18c7d0ef7f684fad733180fc2e706",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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