Scenario Earth Orientation Parameters

Use to update the Earth Orientation Parameters (EOP) file.

Option	Description
Start Time	Displays a read-only date based on the selected EOP file.
Stop Time	Displays a read-only date based on the selected EOP file.
Filename	Specifies an EOP file (.dat) located in the DynamicEarthData directory or an EOP file (.txt) provided by CelesTrak, which can be downloaded from http://celestrak.com/SpaceData. Use the browse button to browse to a file in a different directory. The newly selected file will be read when you click Apply. If you use a script to update the contents of the EOP file after you bring up STK, click Reload EOP file to force the EOP data to be reloaded. Note: The source of the observed data in the CelesTrak-provided EOP file is IERS. The values are slightly different from the USNO data that the standard EOP.dat file contains. For more information, see Using EOP and Space Weather Data for Real-Time Operations by David A. Vallado of the Center for Space Standards & Innovation (CSSI).

Option

Description

Start Time

Displays a read-only date based on the selected EOP file.

Stop Time

Displays a read-only date based on the selected EOP file.

Filename

Specifies an EOP file (.dat) located in the DynamicEarthData directory or an EOP file (.txt) provided by CelesTrak, which can be downloaded from http://celestrak.com/SpaceData.

Use the browse button to browse to a file in a different directory. The newly selected file will be read when you click Apply.

If you use a script to update the contents of the EOP file after you bring up STK, click Reload EOP file to force the EOP data to be reloaded.

Note: The source of the observed data in the CelesTrak-provided EOP file is IERS. The values are slightly different from the USNO data that the standard EOP.dat file contains. For more information, see Using EOP and Space Weather Data for Real-Time Operations by David A. Vallado of the Center for Space Standards & Innovation (CSSI).