def parse_T02_file(T02_fileobj):
    """input is T02_fileobj (path), output is station, doy and hour_letter"""
    if not T02_fileobj.is_file():
        return [None, None, None]
    T02 = T02_fileobj.as_posix().split('/')[-1]
    station = T02[:4]
    hour_letter = T02.split('.')[0][-1]
    day_of_year = T02[4:7]
    return station, day_of_year, hour_letter