Planet Mean Density Lookup

Independently verified planet mass/radius/epoch mean-density reference. Exact independently verified context/edition key; not embedded or live reference data. Model only, not an ephemeris, measured stellar identity or observational guarantee.

Description

Mean planetary density summarizes mass over a declared volume.

Mean planetary density summarizes mass over a declared volume.^[1]

Reference values require consistent body definitions and units. Use Planet Mean Density Lookup to retrieve an exact caller-supplied reference entry.

When to use Planet Mean Density Lookup

Use Planet Mean Density Lookup to retrieve an exact caller-supplied reference entry. Choose an independently reviewed reference for the exact historical, cultural or technical context, then supply its keys and texts.

How to use Planet Mean Density Lookup and understand its results

Choose an independently reviewed reference for the exact historical, cultural or technical context, then supply its keys and texts.
Enter Caller verified planet density keys, Caller verified planet density notices, Query planet density key using the field table and validation rules below, then run the tool.
Read Matched caller notice; interpret the units, signs, ordering and unknown-value placeholders described below.
Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.

Input field	Meaning	Value type	Requirement
callerVerifiedPlanetDensityKeys	Caller verified planet density keys	array of string	Required; constraints below
callerVerifiedPlanetDensityNotices	Caller verified planet density notices	array of string	Required; constraints below
queryPlanetDensityKey	Query planet density key	string	Required; constraints below

Provide aligned, nonempty arrays of reference keys and independently verified notices, then enter the exact query key. Keys must be unique, nonblank and at most 128 UTF-16 code units long; notices must be nonblank. Matching is case sensitive and does not trim the query or returned text. The matching notice is returned unchanged; an unknown key is an input error. The reference contents and their applicability are supplied by the caller; the tool does not retrieve external records or verify source authority.

matched reference = suppliedTexts[indexOfExactQueryKey(suppliedKeys)]

Use the field order, units and branch conditions described above.

Output field	Meaning	Value type
matchedCallerNotice	Exact caller-supplied notice, unchanged and unverified.	string

json

{
  "input": {
    "callerVerifiedPlanetDensityKeys": [
      "context-a/edition-a",
      "context-a/edition-b"
    ],
    "callerVerifiedPlanetDensityNotices": [
      "independently verified reference a",
      "independently verified reference b"
    ],
    "queryPlanetDensityKey": "context-a/edition-b"
  },
  "output": {
    "matchedCallerNotice": "independently verified reference b"
  }
}

Limitations and assumptions

Reference values require consistent body definitions and units. Apply the exact scope and assumptions explained above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.

Alternative or Complementary methods

Use Planet Surface Gravity Lookup for a related task: Planetary surface gravity depends on the reference surface and rotational convention.

Use Planet Day Length Lookup for a related task: Planetary day length can mean different rotation or solar-day conventions.

References

Planet Mean Density Lookup — tool.io

Similar or alternative tools

Planet Surface Gravity Lookup
Planetary surface gravity depends on the reference surface and rotational convention.
Planet Day Length Lookup
Planetary day length can mean different rotation or solar-day conventions.