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@komasaru komasaru/tle_iss_nasa.py
Last active Aug 15, 2018

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Python script to get TLE from NASA.
#! /usr/local/bin/python3.6
"""
直近 TLE データ取得 (from NASA)
: 過去の直近の TLE データ1件を取得する
(過去データが存在しなければ、未来の直近データ)
date name version
2018.06.12 mk-mode.com 1.00 新規作成
Copyright(C) 2018 mk-mode.com All Rights Reserved.
---
引数 : [YYYYMMDD[HHMMSS]]
(JST を指定。無指定なら現在時刻とみなす)
"""
from datetime import datetime
from datetime import timedelta
import re
import requests
import sys
import traceback
class TleIssNasa:
URL = (
"https://spaceflight.nasa.gov/realdata/sightings/"
"SSapplications/Post/JavaSSOP/orbit/ISS/SVPOST.html"
)
UA = (
"mk-mode Bot (by Python/{}.{}.{}, "
"Administrator: postmaster@mk-mode.com)"
).format(
sys.version_info.major,
sys.version_info.minor,
sys.version_info.micro
)
MSG_ERR = (
"Invalid date!\n"
"[USAGE] ./tle_iss_nasa.rb [YYYYMMDD[HHMMSS]]"
)
def __init__(self):
if len(sys.argv) < 2:
self.jst = datetime.now()
else:
if re.search(r"^(\d{8}|\d{14})$", sys.argv[1]) is not(None):
dt = sys.argv[1].ljust(14, "0")
try:
self.jst = datetime.strptime(dt, "%Y%m%d%H%M%S")
except ValueError as e:
print(self.MSG_ERR)
sys.exit(1)
else:
print(self.MSG_ERR)
sys.exit(0)
self.utc = self.jst - timedelta(hours=9)
def exec(self):
""" Execution """
tle = ""
utc_tle = None
try:
print(self.jst.strftime("%Y-%m-%d %H:%M:%S.%f JST"))
print(self.utc.strftime("%Y-%m-%d %H:%M:%S.%f UTC"))
print("---")
tles = self.__get_tle()
for new in reversed(tles):
tle = new
item_utc = re.split(" +", tle[0])[3]
y = 2000 + int(item_utc[0:2])
d = float(item_utc[2:])
utc_tle = datetime(y, 1, 1) + timedelta(days=d)
if utc_tle <= self.utc:
break
print("\n".join(tle))
print(utc_tle.strftime("(%Y-%m-%d %H:%M:%S.%f UTC)"))
except Exception as e:
raise
def __get_tle(self):
""" 最新 TLE 一覧取得 """
res = []
try:
html, status, reason = self.__get_html()
if status != 200 or reason != "OK":
print((
"STATUS: {} ({})"
"[ERROR] Could not retreive html."
).format(status, reason))
sys.exit(1)
for tle in re.findall(r"ISS\n +(1.+?)\n +(2.+?)\n", html):
res.append([tle[0], tle[1]])
return res
except Exception as e:
raise
def __get_html(self):
""" HTML 取得 """
try:
headers = {'User-Agent': self.UA}
res = requests.get(self.URL, headers)
return [res.text, res.status_code, res.reason]
except Exception as e:
raise
if __name__ == '__main__':
try:
obj = TleIssNasa()
obj.exec()
except Exception as e:
traceback.print_exc()
sys.exit(1)
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