tleparse.py

import pprint


def tleparse(line1, line2):
    """
    Parses a TLE (two line elements) and returns a dictionary containing the data from the TLE.

    For more information on TLE format: https://en.wikipedia.org/wiki/Two-line_element_set

    Args:
        line1: The first line of a TLE.
        line2: The second line of a TLE.

    Returns:
        A dictionary containing all the information from the TLE. Example:
        {
            'catalog': '25544', # Satellite catalog number and classification level
            'class': 'U', # Classification level
            'id': '98067A', # International designator
            'id_year': 98, # Year component of ID
            'id_number': 067, # Launch number component of ID
            'id_piece': A, # Piece of launch from ID
            'epoch': '08264.51782528', # Epoch
            'epoch_year': 8, # Epoch year
            'epoch_day': 264.51782528, # Epoch day of year and fractional day
            'bc': 0.00000140, # Ballistic coefficient, or first derivative of mean motion
            'drag': 0.000011606, # Drag term
            'inc': 51.6416, # Inclination in degrees
            'ra_an': 247.4627, # Right ascension of ascending node
            'ecc': 0.0006703, # Eccentricity
            'arg_peri': 130.5360, # Argument of perigee
            'mean_anomaly': 325.0288, # Mean anomaly
            'mean_motion': 15.72125391, # Number of revolutions per day
            'revolutions': 56353
        }
    """

    line1 = line1.strip()
    line2 = line2.strip()
    output = {}

    assert line1[0:1] == '1', "Line 1 needs to start with 1 to be a valid TLE"
    assert line2[0:1] == '2', "Line 2 needs to start with 2 to be a valid TLE"

    output['catalog'] = line1[2:7]
    output['class'] = line1[7:8]
    output['id'] = line1[9:17].strip()
    output['id_year'] = int(line1[9:11])
    output['id_number'] = int(line1[11:14])
    output['id_piece'] = line1[14:17].strip()
    output['epoch'] = line1[18:32]
    output['epoch_year'] = int(line1[18:20])
    output['epoch_day'] = float(line1[20:32])
    output['bc'] = float(line1[33:43])
    output['drag'] = float(line1[53:54] + "0." + "0"*int(line1[60:61]) + line1[54:59])
    output['inc'] = float(line2[8:16])
    output['ra_an'] = float(line2[17:25])
    output['ecc'] = float("0." + line2[26:33])
    output['arg_peri'] = float(line2[34:42])
    output['mean_anomaly'] = float(line2[43:51])
    output['mean_motion'] = float(line2[52:63])
    output['revolutions'] = int(line2[63:68])

    return output


if __name__ == '__main__':
    sampleTLE = "1 25544U 98067A   08264.51782528 -.00002182  00000-0 -11606-4 0  2927\n2 25544  51.6416 247.4627 0006703 130.5360 325.0288 15.72125391563537"
    sampleTLE = sampleTLE.split("\n")
    pprint.pprint(tleparse(sampleTLE[0], sampleTLE[1]))