HTool can import file containing the Horizons generated output. This feature is used for testing, but could be used if you wish to pre-generate your data.

   1. Use the horizon web-interface: https://ssd.jpl.nasa.gov/horizons/app.html#/
   
   2. Use the following setting:

      1. Ephemeris Type: Observer Table
      2. Target Body: [your choice]


            Ephemeris Type:  OBSERVER
               Target Body:  [your choice]
         Observer Location:  Observer Location: Mauna Kea (observatory) [code: 568]
                 Time Span:  [Enter 2 hour period using Step of 5m in UT]
             Table Setting:  "Custom"
                             Select 1, 3, 4, 9 ONLY
                             In Addition Table Setting, 
                                select "Extra precision"
                                do not select "CSV format"
            Display/Output:  download/save (plan text file)

   Here is an web interface screen shot:

   


   3. Generate the data and save to a file.
      (for example, 'horizons_results.txt')
      The generated data should be formatted as so:

************************************************************************************************************************
 Date__(UT)__HR:MN     R.A._________(ICRF)_________DEC  dRA*cosD d(DEC)/dt  Azimuth__(r-app)__Elevation    APmag   S-brt
************************************************************************************************************************
$$SOE
 2021-Nov-02 20:46 *m  12 51 59.124870 -01 39 34.82530  1077.673  -973.220  193.614495135  67.834130679   -6.793   6.353
 2021-Nov-02 20:51 *m  12 52 05.117427 -01 40 55.94326  1079.677  -972.633  196.731658166  67.509846877   -6.791   6.354
 2021-Nov-02 20:56 *m  12 52 11.122309 -01 42 17.01153  1082.084  -972.024  199.756485461  67.126589465   -6.788   6.354
 2021-Nov-02 21:01 *m  12 52 17.141757 -01 43 38.02839  1084.894  -971.395  202.679262543  66.687276531   -6.786   6.354

   5. Click on the import tab. Enter you filename, and click import.