# NASA Exoplanets Equilibrium Temperature Calculator

> NASA Exoplanets Equilibrium Temperature 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 a planet's equilibrium temperature in Kelvin, Celsius, and Fahrenheit from orbital parameters and stellar properties

## Facts

- Endpoint: GET https://exoplanets-nasa.x402tookit.com/equilibrium-temperature?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nasa-exoplanets-equilibrium-temperature-calculator-253baaf2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4VLtsHJ4v1kmhz9oPAMbK

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability nasa-exoplanets-equilibrium-temperature-calculator-253baaf2
```

Example prompt: What's the equilibrium temperature in Kelvin, Celsius, and Fahrenheit for a planet orbiting at 1 AU from a star with luminosity 1.0 solar units, assuming a Bond albedo of 0.3?

## When to prefer this

Use this endpoint when you need a quick, physics-based planetary equilibrium temperature calculation from stellar and orbital parameters without running a full climate model. Ideal for screening exoplanet habitability, comparing candidate planets, or enriching planet datasets with thermal estimates. It supports both luminosity-direct and temperature+radius inputs, making it flexible for catalog data.

## Known failure modes

- Missing required orbitAu parameter returns an error
- orbitAu outside range 0.001–1000 AU may be rejected
- Providing neither luminositySolar nor both teffK+radiusSolar returns an error — one of these combinations is required
- albedo outside 0–0.95 may produce a validation error
- Conflicting stellar inputs (all three of luminositySolar, teffK, radiusSolar) may yield unexpected behavior

## How this service works

Planet equilibrium temperature in K, C and F from star luminosity or temperature and radius, orbit distance and albedo.

## Output

Returns equilibrium temperature in Kelvin, Celsius, and Fahrenheit; zero-albedo temperature in Kelvin; insolation relative to Earth; derived or provided luminosity in solar units; a summary string; and metadata including albedo used, orbit in AU, data source, and any warnings or reasons.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "orbitAu"
     ],
     "properties": {
      "teffK": {
       "type": "number",
       "description": "Star effective temperature in K (with radiusSolar)"
      },
      "albedo": {
       "type": "number",
       "description": "Bond albedo 0 to 0.95 (default 0; Earth is about 0.3)"
      },
      "orbitAu": {
       "type": "number",
       "description": "Semi-major axis in AU, 0.001 to 1000"
      },
      "radiusSolar": {
       "type": "number",
       "description": "Star radius in solar radii (with teffK)"
      },
      "luminositySolar": {
       "type": "number",
       "description": "Star luminosity in solar units (give this, or teffK with radiusSolar)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "albedo": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "orbitAu": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "zeroAlbedoK": {
       "type": [
        "null",
        "number"
       ]
      },
      "equilibriumC": {
       "type": [
        "null",

… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nasa-exoplanets-equilibrium-temperature-calculator-253baaf2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from exoplanets-nasa.x402tookit.com](https://www.zero.xyz/host/exoplanets-nasa.x402tookit.com/llms.txt)