CIO Locator Celestial Intermediate Pole s-prime Complement Calculator
IERS approximate terrestrial TIO locator s-prime=-47 microarcsec*T; distinguishes it from celestial CIO locator s, which is not computed.
Description
CIO Locator Celestial Intermediate Pole s-prime Complement Calculator: return approximate terrestrial sp microarcsec, celestial cio locator computed.
The terrestrial s-prime locator and the celestial CIO locator are different quantities. The title must not lead the terrestrial approximation to be read as a celestial locator.1
This tool returns approximate terrestrial sp microarcsec, celestial cio locator computed. 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 TT Julian centuries from J2000 by -47 to return approximateTerrestrialSpMicroarcsec. Accept centuries from -10 to +10.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| ttJulianCenturiesFromJ2000 | Tt julian centuries from j2000. | Finite number; from -10 to 10 inclusive |
| Output field | Interpretation |
|---|---|
| result | Object containing the following named result fields. |
| result.approximateTerrestrialSpMicroarcsec | Approximate terrestrial sp microarcsec; use the stated units and sign convention. |
| result.celestialCioLocatorComputed | Always false: the numerical output is a terrestrial s-prime approximation. |
{
"input": {
"ttJulianCenturiesFromJ2000": 1
},
"output": {
"result": {
"approximateTerrestrialSpMicroarcsec": -47,
"celestialCioLocatorComputed": false
}
}
}Limitations and assumptions
- celestialCioLocatorComputed is always false; no celestial pole series or full Earth-orientation transform is evaluated.
- 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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