Hill radius of a planet in AU and km from its mass, orbit, eccentricity and star...
https://exoplanets-nasa.x402tookit.com/hill-radiusOverview
Hill radius of a planet in AU and km from its mass, orbit, eccentricity and star mass, with the stable-moon region.
Protocol
x402
Price
$0.02
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
uncategorized
Provider
NASA Exoplanets
Source
bazaar
Indexed
2026-10-20 22:22:41
Health
Status
healthy
Latency (p50)
708ms
Uptime (30d)
86.7%
Reliability Score
83.3/100
Last Checked
2026-10-28 06:39:25
Last Healthy
2026-10-28 06:39:25
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Input Schema
{
"method": "GET",
"queryParams": {
"eccentricity": 0.0167,
"massUnit": "earth",
"orbitAu": 1,
"planetMass": 1,
"starMassSolar": 1
},
"type": "http"
}
Output Schema
{
"example": {
"asOf": "2026-10-11T08:48:42.237Z",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"hillRadiusAu": 0.0098368,
"hillRadiusInEarthRadii": 230.7,
"hillRadiusInJupiterRadii": 20.58,
"hillRadiusKm": 1471600,
"notChecked": [
"the real stability of a moon: tides, the planet's spin and other bodies matter, and close-in planets lose moons to tidal decay",
"other planets in the system",
"…1 more"
],
"planetMassSolar": 0.0000030035,
"reasons": [
"Hill radius = a (1 - e) (m / 3M)^(1/3).",
"Stable satellite orbits extend to about 0.49 of the Hill radius for prograde moons and about 0.93 for retrograde moons (Domingos et al. 2006)."
],
"source": "computed locally",
"stableProgradeAu": 0.004815,
"stableProgradeKm": 720300,
"stableRetrogradeAu": 0.009157,
"stableRetrogradeKm": 1370000,
"summary": "Hill radius 0.009837 au (1472000 km) for a 1 earth-mass planet at 1 au around a 1 solar-mass star (eccentricity 0.0167). Prograde moons are stable out to roughly 720000 km.",
"verdict": "COMPUTED"
},
"type": "json"
}