Main Sequence Mass By Type Lookup
Independently documented main-sequence spectral-subclass mass reference, metallicity/evolution spread not eliminated. Exact independently documented reference matching, signed discrepancy retained. Model only, not an ephemeris, measured stellar identity or observational guarantee.
Description
Main-sequence mass references depend on calibration and stellar classification.
Main-sequence mass references depend on calibration and stellar classification.1
This lookup compares a supplied observation with a caller catalog rather than deriving mass from a spectrum. Use Main Sequence Mass By Type Lookup to evaluate the supplied inputs under the model explained below.
When to use Main Sequence Mass By Type Lookup
Use Main Sequence Mass By Type Lookup to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.
How to use Main Sequence Mass By Type Lookup and understand its results
- Establish the units, measurement scope and model assumptions before entering values.
- Enter Caller verified main sequence mass keys, Caller verified main sequence mass values, Query main sequence mass key, Observed main sequence mass value using the field table and validation rules below, then run the tool.
- Read Caller reference value, Signed observed minus reference; 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 |
|---|---|---|---|
| callerVerifiedMainSequenceMassKeys | Caller verified main sequence mass keys | array of string | Required; constraints below |
| callerVerifiedMainSequenceMassValues | Caller verified main sequence mass values | array of number | Required; constraints below |
| queryMainSequenceMassKey | Query main sequence mass key | string | Required; constraints below |
| observedMainSequenceMassValue | Observed main sequence mass value | number | Required; constraints below |
Enter nonempty unique nonblank keys of at most 128 UTF-16 code units, aligned positive finite reference values, an exact query key and a positive finite observed value in the same declared units. Perform a case-sensitive key lookup and return the reference plus observed minus reference. Unknown keys fail. No reference catalog, unit conversion, uncertainty or applicability verification is installed.
reference=values[indexOfExactQuery(keys)]; discrepancy=observed−reference Use the field order, units and branch conditions described above.
| Output field | Meaning | Value type |
|---|---|---|
| callerReferenceValue | Exact selected caller numeric reference in the caller’s consistent unit. | number |
| signedObservedMinusReference | Signed observed minus selected reference in the same unit. | number |
{
"input": {
"callerVerifiedMainSequenceMassKeys": [
"a",
"b"
],
"callerVerifiedMainSequenceMassValues": [
2,
4
],
"queryMainSequenceMassKey": "b",
"observedMainSequenceMassValue": 5
},
"output": {
"callerReferenceValue": 4,
"signedObservedMinusReference": 1
}
}Limitations and assumptions
This lookup compares a supplied observation with a caller catalog rather than deriving mass from a spectrum. 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 Main Sequence Lifetime Calculator for a related task: A power-law lifetime model combines mass with a reference lifetime and luminosity exponent.
Use Spectral Class Properties Lookup for a related task: Spectral classifications summarize properties under a particular classification convention.
References
-
Main Sequence Mass By Type Lookup — tool.io
Similar or alternative tools
- Main Sequence Lifetime Calculator
A power-law lifetime model combines mass with a reference lifetime and luminosity exponent.
- Spectral Class Properties Lookup
Spectral classifications summarize properties under a particular classification convention.