Atmospheric Extinction mag/Airmass
Differential same-passband atmospheric extinction against independent reference airmass, signed differences retained. Model only, not an ephemeris, measured stellar identity or observational guarantee.
Description
Extinction can be compared across airmasses with a band-specific coefficient.
Extinction can be compared across airmasses with a band-specific coefficient.1
A signed additional-extinction value describes the chosen linear relation rather than a full atmospheric correction. Use Atmospheric Extinction mag/Airmass to evaluate the supplied inputs under the model explained below.
When to use Atmospheric Extinction mag/Airmass
Use Atmospheric Extinction mag/Airmass to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.
How to use Atmospheric Extinction mag/Airmass and understand its results
- Establish the units, measurement scope and model assumptions before entering values.
- Enter Observed airmass, Reference airmass, Caller band extinction mag per airmass using the field table and validation rules below, then run the tool.
- Read Signed additional extinction magnitudes; 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 |
|---|---|---|---|
| observedAirmass | Observed airmass | number | Required; constraints below |
| referenceAirmass | Reference airmass | number | Required; constraints below |
| callerBandExtinctionMagPerAirmass | Caller band extinction mag per airmass | number | Required; constraints below |
Enter positive observed and reference airmasses and nonnegative extinction coefficient in magnitudes per airmass. Return (observed−reference)×coefficient, retaining negative differences. No atmospheric fit, band correction or horizon model occurs.
additionalExtinctionMag=(observedAirmass−referenceAirmass)×callerCoefficient Use the field order, units and branch conditions described above.
| Output field | Meaning | Value type |
|---|---|---|
| signedAdditionalExtinctionMagnitudes | Signed additional extinction magnitudes | number |
{
"input": {
"observedAirmass": 2,
"referenceAirmass": 1,
"callerBandExtinctionMagPerAirmass": 0.2
},
"output": {
"signedAdditionalExtinctionMagnitudes": 0.2
}
}Limitations and assumptions
A signed additional-extinction value describes the chosen linear relation rather than a full atmospheric correction. 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 Combined Binary Star Magnitude Calculator for a related task: Combined magnitude follows from adding fluxes rather than averaging magnitudes.
Use Apparent to Absolute Magnitude Converter for a related task: Absolute magnitude refers brightness to the conventional reference distance.
References
-
Atmospheric Extinction mag/Airmass — tool.io
Similar or alternative tools
- Combined Binary Star Magnitude Calculator
Combined magnitude follows from adding fluxes rather than averaging magnitudes.
- Apparent to Absolute Magnitude Converter
Absolute magnitude refers brightness to the conventional reference distance.