Earth Orientation Parameters (EOP) data run time warnings
-
Angel Rocha 6645752e1159d
- Posts: 6
- Joined: Thu May 16, 2024 2:53 am
Earth Orientation Parameters (EOP) data run time warnings
Users may receive a 'Run time warning' when running a Mission Plan that propagates a spacecraft into the future. This warning lets users know that the EOP data file used by FreeFlyer does not fully cover the timespan of the Mission Plan.
For additional context, FreeFlyer's EOP data file comes from the Celestrak Earth Orientation Parameters file. Celestrak updates and publishes the data file hosted on their website daily and the most up to date data file will only extend out 1 year into the future for prediction data.
Users have the option to replace the ' earth_orientation_parameters_celestrak.csv' data with a a more up to date version from the Celestrak website. The file is located under 'C:\Program Files\a.i. solutions, Inc\FreeFlyer 7.X.X.XXXXXXXX (64-Bit)\data' by default.
Example Warning Message:
Run time warning.
Location: Mission Plan Line 1499
Script: DataArray[9] = Duplex.Height.ToString + ","
Message: The Earth Orientation Parameters data provided by "C:\Program Files\a.i. solutions, Inc\FreeFlyer 7.9.0.44769217 (64-Bit)\data\earth_orientation_parameters_celestrak.csv" spans from Jan 01 1962 UTC to Oct 08 2024 UTC inclusive. An attempt was made to get pole coordinates for Oct 01 2025 UTC which was not within that span. The corrections will be set to zero as a fallback. To fix this warning, configure an Earth Orientation Parameters file which covers the required span. Subsequent warnings of this kind will be suppressed for the remainder of this run.
For additional context, FreeFlyer's EOP data file comes from the Celestrak Earth Orientation Parameters file. Celestrak updates and publishes the data file hosted on their website daily and the most up to date data file will only extend out 1 year into the future for prediction data.
Users have the option to replace the ' earth_orientation_parameters_celestrak.csv' data with a a more up to date version from the Celestrak website. The file is located under 'C:\Program Files\a.i. solutions, Inc\FreeFlyer 7.X.X.XXXXXXXX (64-Bit)\data' by default.
Example Warning Message:
Run time warning.
Location: Mission Plan Line 1499
Script: DataArray[9] = Duplex.Height.ToString + ","
Message: The Earth Orientation Parameters data provided by "C:\Program Files\a.i. solutions, Inc\FreeFlyer 7.9.0.44769217 (64-Bit)\data\earth_orientation_parameters_celestrak.csv" spans from Jan 01 1962 UTC to Oct 08 2024 UTC inclusive. An attempt was made to get pole coordinates for Oct 01 2025 UTC which was not within that span. The corrections will be set to zero as a fallback. To fix this warning, configure an Earth Orientation Parameters file which covers the required span. Subsequent warnings of this kind will be suppressed for the remainder of this run.