Earth Twin Angular Separation milliarcseconds at 10 pc Calculator
Ideal small-angle projected AU/pcseparation in milliarcseconds; Earth-twin at1projected AU and 10 pc gives 100 mas. Inclination, phase, eccentricity and coronagraph sensitivity not inferred.
Description
Projected orbital separation and stellar distance determine a small-angle apparent separation.
Projected orbital separation and stellar distance determine a small-angle apparent separation.1
The 10-parsec example is a scale illustration rather than a fixed input constraint. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Earth Twin Angular Separation milliarcseconds at 10 pc Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the observation or experimental context, reference/calibration source, unit basis and adopted model assumptions.
How to use Earth Twin Angular Separation milliarcseconds at 10 pc Calculator and understand its results
- Establish the observation or experimental context, reference/calibration source, unit basis and adopted model assumptions.
- Enter projectedOrbitalSeparationAu, stellarDistanceParsecs, using the field meanings and rules below, then run the tool.
- Read result.conditionalAngularSeparationMilliarcseconds. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| projectedOrbitalSeparationAu | Projected orbital separation au | number | Required |
| stellarDistanceParsecs | Stellar distance parsecs | number | Required |
Require nonnegative projected separation in AU and positive distance in parsecs. Return 1000×separation/distance in milliarcseconds. Inputs are not fixed to 1 AU or 10 pc; no orbit projection or detectability estimate is inferred.
angularSeparationMas=1000×projectedSeparationAu/stellarDistancePc Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.conditionalAngularSeparationMilliarcseconds | Conditional Angular Separation Milliarcseconds; use the units, sign convention and calculation stated above | number |
{
"input": {
"projectedOrbitalSeparationAu": 1,
"stellarDistanceParsecs": 10
},
"output": {
"result": {
"conditionalAngularSeparationMilliarcseconds": 100
}
}
}Limitations and assumptions
The 10-parsec example is a scale illustration rather than a fixed input constraint. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Starshade IWA Fresnel Number Geometry Check to examine a related aspect: Starshade geometry relates radius, separation and wavelength to angular scale and Fresnel number.
Use Technosignature Narrowband Width Hz Artificiality Classifier where its separate inputs and scope apply: A narrowband signal's measured width should be considered alongside channel resolution.
References
Similar or alternative tools
- Starshade IWA Fresnel Number Geometry Check
Starshade geometry relates radius, separation and wavelength to angular scale and Fresnel number.
- Technosignature Narrowband Width Hz Artificiality Classifier
A narrowband signal's measured width should be considered alongside channel resolution.