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NASA Exoplanets Transit Depth Calculator
x402
NASA Exoplanets Transit Depth Calculator is a paid API for AI agents from exoplanets-nasa.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates exoplanet transit depth (Rp/Rs)² in percent, ppm, and fraction from planet and star radii, with optional transit duration if orbital period and star mass are provided.
Price / call$0.02
Success—
StatusUnknown
How this service works
Transit depth (Rp/Rs squared) in percent and ppm from planet and star radius, plus duration if period and star mass are given.
Output
Returns the radius ratio (Rp/Rs), transit depth as a fraction, in percent, and in ppm; planet and star radii in km; optionally the semi-major axis in AU and transit duration in hours with the formula used; plus metadata fields like source, formula string, and any disclaimers.
Example use cases
Hot Jupiter transit depth estimation
“What's the transit depth in ppm and percent for a hot Jupiter of radius 1.2 Jupiter radii around a star with 1.0 solar radii, with a 4-day orbital period and 1.0 solar mass — also tell me how long the transit lasts.”
Earth-analog transit signal check
“Compute the transit depth for an Earth-sized planet (1.0 Earth radii) orbiting a Sun-like star (1.0 solar radii) with a 365-day period and 1.0 solar mass. How many ppm would it block?”
Super-Earth around red dwarf transit planning
“Calculate the transit depth and duration for a 2.5 Earth-radius super-Earth around a red dwarf star with 0.3 solar radii and 0.3 solar masses on a 12-day orbit — I want the result in both percent and ppm.”
Technical details
Endpoint
GEThttps://exoplanets-nasa.x402tookit.com/transit-depth?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, formula-based computation of exoplanet transit depth and duration from basic physical parameters (planet radius, star radius, orbital period, star mass). It is ideal for astrophysics pipelines, observation planning tools, educational applications, or any agent that needs to quickly convert radii into photometric transit signals without querying a full planetary catalog. Prefer this over a catalog lookup when you have specific radius values and want the raw physics calculation.
Side effects
- Missing required parameters planetRadius or starRadiusSolar returns an error
- Planet or star radius values outside supported range (0.01–1000) may produce errors or nonsensical results
- Providing periodDays without starMassSolar (or vice versa) omits transit duration
- Invalid planetUnit string (not 'earth' or 'jupiter') may cause incorrect unit conversion
- Impact parameter outside 0–1 range may yield unphysical results
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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