Inner Working Angle Coronagraph Separation lambda/D Check
Angular separation compared to caller coronagraph IWA multiple of lambda/D; no contrast, throughput or successful imaging guarantee.
Description
Inner Working Angle Coronagraph Separation lambda/D Check: return outside or at caller iwa.
A coronagraph's inner working angle describes an instrument-dependent angular separation near the star. It is often expressed as a multiple of wavelength over aperture.
This tool returns outside or at caller iwa. Use the stated units and model convention when interpreting these fields.
When to use this tool
Use this tool when the supplied inputs match the specific operation described above and you need a repeatable result under its stated convention.
- Check the supported input and output contract against an existing calculation or observation.
- Use the complete example to confirm units, selector spelling and result interpretation.
How to use the tool and how it works
- Enter every field in the input table using the stated units and the exact supported selector spelling where applicable.
- Run the tool. Correct input errors before interpreting an output.
- Read the result fields below; use accompanying flags and the stated sign, boundary or model convention when interpreting a number.
Calculate the caller's multiplier times wavelengthM divided by apertureM, then test whether separationRad is at least that boundary.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| separationRad | Separation rad. | Finite number; zero or greater |
| wavelengthM | Wavelength m. Meters. | Finite number; greater than zero |
| apertureM | Aperture m. Meters. | Finite number; greater than zero |
| callerLambdaDMultiplier | Caller lambda d multiplier. | Finite number; greater than zero |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.outsideOrAtCallerIwa | Outside or at caller iwa flag under the exact conditions described above. |
{
"input": {
"separationRad": 0.000002,
"wavelengthM": 0.000001,
"apertureM": 1,
"callerLambdaDMultiplier": 2
},
"output": {
"result": {
"outsideOrAtCallerIwa": true
}
}
}Limitations and assumptions
- Being outside this angular boundary does not establish sufficient contrast, sensitivity or detectability.
- Every declared field is required and unexpected fields are rejected. Numeric inputs must be finite; input errors are distinct from a valid false result or an explicitly qualified output.
- Extremely large inputs and nonfinite or excessively large outputs are rejected. List positions reported by the tool use zero-based indices unless stated otherwise.
Alternative or Complementary methods
Check the underlying observations, units and conventions independently before using the result in a larger workflow. The tools listed below address nearby tasks; compare their inputs and scope before substituting one for this operation.
References
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