SPK for DSS-30
  =====================================================================

  Original file name:                   dss_30_itrf93_210201.bsp
  Creation date:                        2021-02-02 16:10
  Created by:                           Nat Bachman  (NAIF/JPL)

  Introduction
  =====================================================================

  This file provides geocentric states---position and velocity---as a
  slowly varying function of time for DSS-30, which is the JAXA 54m
  "Misasa" station located at Usuda, Japan. Note that this station is
  not located near the city of Misasa, Japan.

  Station position vectors point from the earth's barycenter to the
  station; the vectors are expressed in the ITRF93 terrestrial
  reference frame. Station velocities are estimates of the derivative
  with respect to time of these vectors; in this file, velocity is
  constant. The station velocity has magnitude on the order of a few
  cm/year.

  States obtained from this file are given relative to the terrestrial
  reference frame ITRF93.

  Using this kernel
  =====================================================================

  Kernel loading
  --------------

  In order for a SPICE-based program to make use of this kernel, the
  kernel must be loaded via the SPICE routine FURNSH. If you are
  running application software created by a third party, see the
  documentation for that software for instructions on kernel
  management.

  See also "Associated frame kernels" and "Associated PCK files"
  below.

  Associated PCK files
  --------------------

  This kernel should be used together with a binary Earth PCK file.

     NAIF produces these kernels on a regular basis; they can be
     obtained via anonymous ftp from the NAIF server

        naif.jpl.nasa.gov

     The PCK is located in the path

        pub/naif/generic_kernels/pck

     The file name is of the form

        earth_000101_yymmdd_yymmdd.bpc

     The first two dates are the file's start and stop times; the third
     is the epoch of the last datum in the EOP file: data from
     this epoch forward are predicted.

     The file's coverage starts at a fixed date (currently chosen to
     be 2000 Jan. 1) and extends to the end of the predict region,
     which has a duration of roughly 3 months.

     NAIF also provides a low-accuracy, long-term predict binary Earth
     PCK file. See the path cited above for this file and accompanying
     documentation.

  Associated frame kernels
  ------------------------

  The frame kernel having (original) file name

     dss_30_itrf93_210201.tf

  defines a topocentric reference frame associated with the station
  covered by this file. That kernel supports computations such
  as finding the azimuth and elevation of a target as seen from a
  specified station.


  Data sources
  =====================================================================

  The data provided here are taken from

     [1] Email communication Connie Dang, containing Excel spreadsheet
         from Bill Folkner, dated 2021-01-14.

  Coordinates were converted by Bill Folkner to the "JPL ITRF93" frame at
  epoch 2015 Jan. 1.

 \begindata

   SITES                +=      'DSS-30'
   DSS-30_FRAME         =       'ITRF93'
   DSS-30_CENTER        =       399
   DSS-30_IDCODE        =       399030
   DSS-30_EPOCH         =       @2015-JAN-01/00:00
   DSS-30_BOUNDS        =    (  @1950-JAN-01/00:00,  @2050-JAN-01/00:00  )
   DSS-30_XYZ           =    (  -3854.373623
                                     3427.836393
                                     3741.812921 )
 \begintext

    By convention the topocentric frame epoch is set to a recent date.
    Compared to use of the epoch of the location, when the two differ, this
    provides more accurate topocentric frame orientation for computations
    performed for epochs near the present date, since the topocentric
    frame orientation relative to the ITRF93 frame is implemented as a fixed
    offset (TK) frame.

 \begindata

   DSS-30_TOPO_EPOCH    =       @2021-JAN-21/00:00
   DSS-30_UP            =       'Z'
   DSS-30_NORTH         =       'X'
   DSS-30_DXYZ          =    (   -0.02
                                 -0.009
                                 -0.008 )
 \begintext