Every time an asteroid comes particularly close to our lovely planet, we get a rush of STK users trying to build a scenario depicting this. We point them to the various FAQs but I figured there had to be a better way. So I wrote an ephemeris reader for this.
Step 1: Download Asteroid Ephemeris File from JPL
Go to the JPL Horizons web interface and select the target body and time interval you want.
Make sure you match the settings from the screenshot below:
Under “Table Settings” match the choices below and output the data in plain text.
Download the file.
Step 2: Load the Ephemeris into STK
Install the Jpl Horizons data reader. This will give you an extra ephemeris file option under the external propagator
Step 3: Profit