Orbit data of deep-space mission Hiten in the CCSDS standard format.
Please find the following CCSDS documents for the data format:
https://public.ccsds.org/Pubs/503x0b2c1.pdf   : TRACKING DATA MESSAGE (CCSDS 503.0-B-2)
https://public.ccsds.org/Pubs/502x0b2c1e2.pdf : ORBIT DATA MESSAGES (CCSDS 502.0-B-2)
https://public.ccsds.org/Pubs/500x2g2.pdf     : NAVIGATION DATA MESSAGES OVERVIEW (CCSDS 500.2-G-2)
https://public.ccsds.org/Pubs/500x0g4.pdf     : NAVIGATION DATA DEFINITIONS AND CONVENTIONS (CCSDS 500.0-G-4)

The TDM files format summary:
    The files consist of headers, metadata, and data sections.
    The header section contains "CCSDS_TDM_VERS" and "ORIGINATOR" keywords.
    The metadata is provided in block enclosed by the "META_START" and "META_STOP" keywords.
    The tracking data section is enclosed by the "DATA_START" and "DATA_STOP" keywords.
    Each set of tracking data is provided on each line in the following format:
        keyword  =  timetag  measurement
    Note:
        See "3.4 TDM DATA SECTION (GENERAL SPECIFICATION)" in the CCSDS STANDARD documentation
        for more detailed description.