Parsecs to Parallax Angle Converter
Ideal reciprocal distance-to-parallax in milliarcseconds; no measured parallax bias, uncertainty or catalog inversion.
Description
Parsecs to Parallax Angle Converter: return ideal parallax mas.
A parsec relates distance to annual parallax: one parsec corresponds to one arcsecond in the ideal geometric definition.
This tool returns ideal parallax mas. 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.
Require a positive distance in parsecs and return 1000 divided by that distance as idealParallaxMas.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| distanceParsecs | Distance parsecs. Parsecs. | Finite number; greater than zero |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.idealParallaxMas | Ideal parallax mas; use the stated units and sign convention. |
{
"input": {
"distanceParsecs": 10
},
"output": {
"result": {
"idealParallaxMas": 100
}
}
}Limitations and assumptions
- This ideal conversion does not account for measurement noise, parallax zero points or distance-estimation priors.
- 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
Similar or alternative tools
- J2000 to B1950 Besselian Coordinate Legacy Converter
Static approximate J2000-to-B1950 orientation-only rotation using conventional matrix; E-terms, proper motion, epoch propagation and FK4/FK5 catalog conversion omitted explicitly.
- parallax zero point correction
An astrometric parallax zero point is a supplied additive bias.