Simple TLE parsing script

parse_tle.py

#!/usr/bin/env python3
from sgp4.api import Satrec
from sgp4.earth_gravity import wgs84

if __name__ == "__main__":
    with open("iss.txt", "r") as fp:
        lines = fp.readlines()

    sats = []
    for i in range(len(lines) - 1):
        if (lines[i][0] == "1") and (lines[i+1][0] == "2"):
            sats.append(Satrec.twoline2rv(lines[i], lines[i+1]))

    for sat in sats:
        print(f"NORAD:   {sat.satnum}")
        print(f"Epoch:   {sat.epochyr}{sat.epochdays:013.10f}")
        print(f"Perigee: {sat.altp * wgs84.radiusearthkm:.2f} km")
        print(f"Apogee:  {sat.alta * wgs84.radiusearthkm:.2f} km")