Magnitude & distance modulus API

Solves the distance-modulus relation m-M=5*log10(d/10pc): give any two of apparent magnitude, absolute magnitude, or distance and it returns the third plus the distance modulus. Answers 'Absolute magnitude from apparent magnitude and distance?', 'Distance from the distance modulus?'.

Price$0.04per request

MethodPOST

Route/v1/space/magnitude-distance

StatusLive

MIME typeapplication/json

Rate limit120/minute

Cache0s public

spaceastronomymagnitudedistance-modulusapparent-magnitudeabsolute-magnitudephotometrystellar

API URLhttps://x402.hexl.dev/v1/space/magnitude-distance

Integration docs

Example request

{
  "apparentMagnitude": 0,
  "distancePc": 100
}

Example response

{
  "apparentMagnitude": 0,
  "absoluteMagnitude": -5,
  "distanceModulus": 5,
  "distancePc": 100,
  "distanceLy": 326.156377717,
  "solvedFor": "absoluteMagnitude",
  "interpretation": "Distance modulus 5 → 100 pc (326.2 ly)."
}

Input schema

{
  "type": "object",
  "properties": {
    "apparentMagnitude": {
      "type": "number",
      "examples": [
        0
      ]
    },
    "absoluteMagnitude": {
      "type": "number"
    },
    "distancePc": {
      "type": "number",
      "examples": [
        100
      ]
    },
    "distanceLy": {
      "type": "number"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}