Astrometric Signature Microarcsecond Amplitude Calculator
Small-angle stellar reflex semi-major angular signature using total two-body mass, not inclined apparent-orbit fit or detection certainty.
Description
Astrometric Signature Microarcsecond Amplitude Calculator: return angular semimajor microarcsec.
Astrometric orbital motion is a star's angular displacement about the system barycenter. Physical reflex size and distance together set the angular scale.
This tool returns angular semimajor microarcsec. 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.
Multiply the orbit's AU semimajor axis by planet mass divided by total mass, divide by distance in parsecs and multiply by one million for microarcseconds.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| planetMassKg | Planet mass kg. Kilograms. | Finite number; zero or greater |
| starMassKg | Star mass kg. Kilograms. | Finite number; greater than zero |
| orbitSemimajorAu | Orbit semimajor au. Astronomical units. | Finite number; greater than zero |
| distanceParsecs | Distance parsecs. Parsecs. | Finite number; greater than zero |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.angularSemimajorMicroarcsec | Angular semimajor microarcsec; use the stated units and sign convention. |
{
"input": {
"planetMassKg": 1,
"starMassKg": 999,
"orbitSemimajorAu": 1,
"distanceParsecs": 10
},
"output": {
"result": {
"angularSemimajorMicroarcsec": 100
}
}
}Limitations and assumptions
- The result is an angular semimajor-axis scale, without sky projection, detection noise or an observing schedule.
- 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.
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