Not sure about this, but would be nice if there was a fix for this. The updated picture is shown below.īecause this time the data is constant before 2013 instead of 2011, I'm guessing that STK loads valid parameters for this curve only for a period of around 5 or 6 years. This is likely the reason why the graph was constant after 2017. When opening STK, going for "Utilities" and then "Data Update Utility" allows the user to download new Earth Orientation Parameters, along with other new data. And, then we’d respond, Sure, we got started with Lambert for STK 11.6, but now it’s different, nay better In contrast to the Lambert design tool introduced in STK 11. Why does this happen? How can I be sure that DUT1 is being properly taken into account for frame transformations? It seems like STK does not update the value of DUT1 outside of the 2012 to 2016 interval, even though the scenario spanned from 2000 until 2019. Meanwhile, I've tried to produce a reduced version of this graph with STK, only to find this: The plot provided by Wikipedia for the evolution of DUT1 is: Its value is relevant when performing conversions between the Earth-fixed frames and inertial frames at epochs identified by a UTC time stamp. The time correction DUT1 (sometimes also written DUT) is the difference between Universal Time (UT1), which is defined by Earth's rotation, and Coordinated Universal Time (UTC), which is defined by a network of precision atomic clocks.
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